http://the-moon.us/index.php?title=Stratigraphy&feed=atom&action=historyStratigraphy - Revision history2024-03-28T22:36:32ZRevision history for this page on the wikiMediaWiki 1.31.1http://the-moon.us/index.php?title=Stratigraphy&diff=12888&oldid=prevApi at 00:53, 16 April 20182018-04-16T00:53:56Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  (glossary entry)<br /> <div id="toc"></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  (glossary entry)<br /> <div id="toc"></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">=Table of Contents=</del></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><br />  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline"><div style="margin-left: 1em">[#Stratigraphy Stratigraphy]</div><div style="margin-left: 2em">[#Stratigraphy-Description Description]</div><div style="margin-left: 2em">[#Stratigraphy-Copernican Copernican]</div><div style="margin-left: 2em">[#Stratigraphy-Eratosthenian Eratosthenian]</div><div style="margin-left: 2em">[#Stratigraphy-Upper Imbrian Upper Imbrian]</div><div style="margin-left: 2em">[#Stratigraphy-Lower Imbrian Lower Imbrian]</div><div style="margin-left: 2em">[#Stratigraphy-Nectarian Nectarian]</div><div style="margin-left: 2em">[#Stratigraphy-Pre-Nectarian Pre-Nectarian]</div><div style="margin-left: 2em">[#Stratigraphy-Additional Information Additional Information]</div><div style="margin-left: 2em">[#Stratigraphy-Stratigraphic List Stratigraphic List]</div><div style="margin-left: 2em">[#Stratigraphy-LPOD Articles LPOD Articles]</div><div style="margin-left: 2em">[#Stratigraphy-Bibliography Bibliography]</div></div></del><br />  </div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Description==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Description==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  The geologic history of the Moon based upon the layering of impact ejecta and the resulting time sequence of events.<br /> <br />  </div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  The geologic history of the Moon based upon the layering of impact ejecta and the resulting time sequence of events.<br /> <br />  </div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>  <del class="diffchange diffchange-inline">This page has been edited 1 times. The last modification was made by <span class="membersnap">- [http://www.wikispaces.com/user/view/tychocrater [[Image:tychocrater-lg.jpg|16px|tychocrater]]] [http://www.wikispaces.com/user/view/tychocrater tychocrater]</span> on Jun 13, 2009 3:24 pm - ''mgx2''</del></div></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>  </div></div></td></tr>
</table>Apihttp://the-moon.us/index.php?title=Stratigraphy&diff=9951&oldid=prevApi at 23:18, 15 April 20182018-04-15T23:18:36Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 23:18, 15 April 2018</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  The geologic history of the Moon based upon the layering of impact ejecta and the resulting time sequence of events.<br /> <br />  </div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  The geologic history of the Moon based upon the layering of impact ejecta and the resulting time sequence of events.<br /> <br />  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Copernican==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Copernican==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''Present - 1.1 b.y.'''<br /> ''Rayed fresh craters.'' We are currently in the ''Copernican'' period of lunar history. There are no definite mare lava flows as young, but small numbers of superposed impact craters suggest that a few lava deposits in northern [<del class="diffchange diffchange-inline">/</del>Oceanus%20Procellarum Oceanus Procellarum] are of Copernican age. The most significant geologic activity on the Moon during the Copernician period has been the continuing (but infrequent) impact cratering.<br /> <br />  </div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>'''Present - 1.1 b.y.'''<br /> ''Rayed fresh craters.'' We are currently in the ''Copernican'' period of lunar history. There are no definite mare lava flows as young, but small numbers of superposed impact craters suggest that a few lava deposits in northern [<ins class="diffchange diffchange-inline">[</ins>Oceanus%20Procellarum<ins class="diffchange diffchange-inline">|</ins>Oceanus Procellarum<ins class="diffchange diffchange-inline">]</ins>] are of Copernican age. The most significant geologic activity on the Moon during the Copernician period has been the continuing (but infrequent) impact cratering.<br /> <br />  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Eratosthenian==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Eratosthenian==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''1.1 - 3.2 b.y.'''<br /> ''Non-rayed fresh craters.'' This was the longest period in Lunar history. During this era late-stage volcanism filled low-lying regions in and around [<del class="diffchange diffchange-inline">/</del>Mare%20Imbrium Mare Imbrium] and [<del class="diffchange diffchange-inline">/</del>Oceanus%20Procellarum Oceanus Procellarum]. Ejecta and secondary craters from some ''Eratosthenian'' impact craters are flooded or embayed by mare lavas.<br /> <br />  </div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>'''1.1 - 3.2 b.y.'''<br /> ''Non-rayed fresh craters.'' This was the longest period in Lunar history. During this era late-stage volcanism filled low-lying regions in and around [<ins class="diffchange diffchange-inline">[</ins>Mare%20Imbrium<ins class="diffchange diffchange-inline">|</ins>Mare Imbrium<ins class="diffchange diffchange-inline">]</ins>] and [<ins class="diffchange diffchange-inline">[</ins>Oceanus%20Procellarum<ins class="diffchange diffchange-inline">|</ins>Oceanus Procellarum<ins class="diffchange diffchange-inline">]</ins>]. Ejecta and secondary craters from some ''Eratosthenian'' impact craters are flooded or embayed by mare lavas.<br /> <br />  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Upper Imbrian==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Upper Imbrian==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''3.2 - 3.75 b.y.'''<br /> ''Maria formation.'' The ''Upper Imbrian'' period was when most of the maria that we presently see on Moon formed - apparently radioactive heating was intense during this time.<br /> <br />  </div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''3.2 - 3.75 b.y.'''<br /> ''Maria formation.'' The ''Upper Imbrian'' period was when most of the maria that we presently see on Moon formed - apparently radioactive heating was intense during this time.<br /> <br />  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Lower Imbrian==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Lower Imbrian==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''3.75 - 3.85 b.y.'''<br /> ''Basin formation.'' The short interval beginning with the [<del class="diffchange diffchange-inline">/</del>Imbrium%2C%20Mare Imbrium] impact and ending with the [<del class="diffchange diffchange-inline">/</del>Mare%20Orientale Orientale] impact is called the ''Lower Imbrian'' period. The formation of the Imbrium and Orientale basins provides the most important and widespread stratigraphic boundaries between the ancient, heavily cratered Moon and the more recent Moon dominated by lava flows and a great reduction in impact cratering.<br /> <br />  </div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>'''3.75 - 3.85 b.y.'''<br /> ''Basin formation.'' The short interval beginning with the [<ins class="diffchange diffchange-inline">[</ins>Imbrium%2C%20Mare<ins class="diffchange diffchange-inline">|</ins>Imbrium<ins class="diffchange diffchange-inline">]</ins>] impact and ending with the [<ins class="diffchange diffchange-inline">[</ins>Mare%20Orientale<ins class="diffchange diffchange-inline">|</ins>Orientale<ins class="diffchange diffchange-inline">]</ins>] impact is called the ''Lower Imbrian'' period. The formation of the Imbrium and Orientale basins provides the most important and widespread stratigraphic boundaries between the ancient, heavily cratered Moon and the more recent Moon dominated by lava flows and a great reduction in impact cratering.<br /> <br />  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Nectarian==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Nectarian==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''3.85 - 3.92 b.y.'''<br /> ''Multiring basins.'' The ''Nectarian'' period is named for the impact basin the contains the relatively small [<del class="diffchange diffchange-inline">/</del>Mare%20Nectaris Mare Nectaris], which is just one of about ten multiring [<del class="diffchange diffchange-inline">/</del>Lunar%20Basins basins] that formed in a brief interval. These basins are all heavily degraded by impacts.<br /> <br />  </div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>'''3.85 - 3.92 b.y.'''<br /> ''Multiring basins.'' The ''Nectarian'' period is named for the impact basin the contains the relatively small [<ins class="diffchange diffchange-inline">[</ins>Mare%20Nectaris<ins class="diffchange diffchange-inline">|</ins>Mare Nectaris<ins class="diffchange diffchange-inline">]</ins>], which is just one of about ten multiring [<ins class="diffchange diffchange-inline">[</ins>Lunar%20Basins<ins class="diffchange diffchange-inline">|</ins>basins<ins class="diffchange diffchange-inline">]</ins>] that formed in a brief interval. These basins are all heavily degraded by impacts.<br /> <br />  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Pre-Nectarian==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Pre-Nectarian==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''3.92 - 4.5 b.y.'''<br /> ''Intense cratering.'' The ''Pre-Nectarian'' period started with the intense cratering associated with the accretion of the Moon by mutual collisions of millions of smaller bodies. The fragments of ruined craters are the oldest and most difficult to recognize on the Moon.<br /> <br />  </div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''3.92 - 4.5 b.y.'''<br /> ''Intense cratering.'' The ''Pre-Nectarian'' period started with the intense cratering associated with the accretion of the Moon by mutual collisions of millions of smaller bodies. The fragments of ruined craters are the oldest and most difficult to recognize on the Moon.<br /> <br />  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Additional Information==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Additional Information==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* Space artist Don Davis' imaginative images prepared under the the direction of [<del class="diffchange diffchange-inline">/</del>Don%20E.%20Wilhelms Don Wilhelms] comparing the Moon's present nearside as it might have appeared in the [http://hdl.loc.gov/loc.gmd/g3196c.wc000003 Middle of the Imbrian Period], [http://hdl.loc.gov/loc.gmd/g3196c.wc000002 End of the Imbrian Period] and [http://hdl.loc.gov/loc.gmd/g3196c.wc000001 Today] are available in the Library of Congress' American Memory Map Collection.</div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* Space artist Don Davis' imaginative images prepared under the the direction of [<ins class="diffchange diffchange-inline">[</ins>Don%20E.%20Wilhelms<ins class="diffchange diffchange-inline">|</ins>Don Wilhelms<ins class="diffchange diffchange-inline">]</ins>] comparing the Moon's present nearside as it might have appeared in the [http://hdl.loc.gov/loc.gmd/g3196c.wc000003 Middle of the Imbrian Period], [http://hdl.loc.gov/loc.gmd/g3196c.wc000002 End of the Imbrian Period] and [http://hdl.loc.gov/loc.gmd/g3196c.wc000001 Today] are available in the Library of Congress' American Memory Map Collection.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br />  </div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br />  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>==[<del class="diffchange diffchange-inline">/</del>Stratigraphic%20List Stratigraphic List]==</div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>==[<ins class="diffchange diffchange-inline">[</ins>Stratigraphic%20List<ins class="diffchange diffchange-inline">|</ins>Stratigraphic List<ins class="diffchange diffchange-inline">]</ins>]==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  A list of the major craters and basins of each stratigraphic age group.<br /> <br />  </div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  A list of the major craters and basins of each stratigraphic age group.<br /> <br />  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==LPOD Articles==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==LPOD Articles==</div></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l27" >Line 27:</td>
<td colspan="2" class="diff-lineno">Line 27:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Bibliography==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Bibliography==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [<del class="diffchange diffchange-inline">/</del>Wood%2C%202003 Wood, 2003], p. 53-55</div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [<ins class="diffchange diffchange-inline">[</ins>Wood%2C%202003<ins class="diffchange diffchange-inline">|</ins>Wood, 2003<ins class="diffchange diffchange-inline">]</ins>], p. 53-55</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* System/Approximate age: Current USGS stratigraphy as presented in Wilhelm's ''[<del class="diffchange diffchange-inline">/</del>Wilhelms%2C%201987 Geologic History of the Moon]''.</div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* System/Approximate age: Current USGS stratigraphy as presented in Wilhelm's ''[<ins class="diffchange diffchange-inline">[</ins>Wilhelms%2C%201987<ins class="diffchange diffchange-inline">|</ins>Geologic History of the Moon<ins class="diffchange diffchange-inline">]</ins>]''.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 1962: EM Shoemaker & RJ Hackman: [http://adsabs.harvard.edu/abs/1962IAUS...14..289S Stratigraphic basis for a lunar time scal] in Z Kopal & ZK Mikhailov (editors) ''The Moon''. The foundation of all geologic mapping of Moon and other planets and satellites in the solar system.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 1962: EM Shoemaker & RJ Hackman: [http://adsabs.harvard.edu/abs/1962IAUS...14..289S Stratigraphic basis for a lunar time scal] in Z Kopal & ZK Mikhailov (editors) ''The Moon''. The foundation of all geologic mapping of Moon and other planets and satellites in the solar system.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 1964: JF McCauley: “The stratigraphy of the Mare Orientale region of the Moon” in ''Astrogeology Studies Annual program Report'', Aug. 1962-July 1963. Flagstaff. First detailed mapping of a lunar basin made possible by Lunar Orbiter images.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 1964: JF McCauley: “The stratigraphy of the Mare Orientale region of the Moon” in ''Astrogeology Studies Annual program Report'', Aug. 1962-July 1963. Flagstaff. First detailed mapping of a lunar basin made possible by Lunar Orbiter images.</div></td></tr>
</table>Apihttp://the-moon.us/index.php?title=Stratigraphy&diff=2965&oldid=prevApi: Created page with "<div id="content_view" class="wiki" style="display: block"> =Stratigraphy= (glossary entry)<br /> <div id="toc"> =Table of Contents= <div style="margin-left: 1em">[#Strat..."2018-04-11T04:59:30Z<p>Created page with "<div id="content_view" class="wiki" style="display: block"> =Stratigraphy= (glossary entry)<br /> <div id="toc"> =Table of Contents= <div style="margin-left: 1em">[#Strat..."</p>
<p><b>New page</b></p><div><div id="content_view" class="wiki" style="display: block"><br />
=Stratigraphy=<br />
(glossary entry)<br /> <div id="toc"><br />
=Table of Contents=<br />
<div style="margin-left: 1em">[#Stratigraphy Stratigraphy]</div><div style="margin-left: 2em">[#Stratigraphy-Description Description]</div><div style="margin-left: 2em">[#Stratigraphy-Copernican Copernican]</div><div style="margin-left: 2em">[#Stratigraphy-Eratosthenian Eratosthenian]</div><div style="margin-left: 2em">[#Stratigraphy-Upper Imbrian Upper Imbrian]</div><div style="margin-left: 2em">[#Stratigraphy-Lower Imbrian Lower Imbrian]</div><div style="margin-left: 2em">[#Stratigraphy-Nectarian Nectarian]</div><div style="margin-left: 2em">[#Stratigraphy-Pre-Nectarian Pre-Nectarian]</div><div style="margin-left: 2em">[#Stratigraphy-Additional Information Additional Information]</div><div style="margin-left: 2em">[#Stratigraphy-Stratigraphic List Stratigraphic List]</div><div style="margin-left: 2em">[#Stratigraphy-LPOD Articles LPOD Articles]</div><div style="margin-left: 2em">[#Stratigraphy-Bibliography Bibliography]</div></div><br /> <br />
==Description==<br />
The geologic history of the Moon based upon the layering of impact ejecta and the resulting time sequence of events.<br /> <br /> <br />
==Copernican==<br />
'''Present - 1.1 b.y.'''<br /> ''Rayed fresh craters.'' We are currently in the ''Copernican'' period of lunar history. There are no definite mare lava flows as young, but small numbers of superposed impact craters suggest that a few lava deposits in northern [/Oceanus%20Procellarum Oceanus Procellarum] are of Copernican age. The most significant geologic activity on the Moon during the Copernician period has been the continuing (but infrequent) impact cratering.<br /> <br /> <br />
==Eratosthenian==<br />
'''1.1 - 3.2 b.y.'''<br /> ''Non-rayed fresh craters.'' This was the longest period in Lunar history. During this era late-stage volcanism filled low-lying regions in and around [/Mare%20Imbrium Mare Imbrium] and [/Oceanus%20Procellarum Oceanus Procellarum]. Ejecta and secondary craters from some ''Eratosthenian'' impact craters are flooded or embayed by mare lavas.<br /> <br /> <br />
==Upper Imbrian==<br />
'''3.2 - 3.75 b.y.'''<br /> ''Maria formation.'' The ''Upper Imbrian'' period was when most of the maria that we presently see on Moon formed - apparently radioactive heating was intense during this time.<br /> <br /> <br />
==Lower Imbrian==<br />
'''3.75 - 3.85 b.y.'''<br /> ''Basin formation.'' The short interval beginning with the [/Imbrium%2C%20Mare Imbrium] impact and ending with the [/Mare%20Orientale Orientale] impact is called the ''Lower Imbrian'' period. The formation of the Imbrium and Orientale basins provides the most important and widespread stratigraphic boundaries between the ancient, heavily cratered Moon and the more recent Moon dominated by lava flows and a great reduction in impact cratering.<br /> <br /> <br />
==Nectarian==<br />
'''3.85 - 3.92 b.y.'''<br /> ''Multiring basins.'' The ''Nectarian'' period is named for the impact basin the contains the relatively small [/Mare%20Nectaris Mare Nectaris], which is just one of about ten multiring [/Lunar%20Basins basins] that formed in a brief interval. These basins are all heavily degraded by impacts.<br /> <br /> <br />
==Pre-Nectarian==<br />
'''3.92 - 4.5 b.y.'''<br /> ''Intense cratering.'' The ''Pre-Nectarian'' period started with the intense cratering associated with the accretion of the Moon by mutual collisions of millions of smaller bodies. The fragments of ruined craters are the oldest and most difficult to recognize on the Moon.<br /> <br /> <br />
==Additional Information==<br />
* Space artist Don Davis' imaginative images prepared under the the direction of [/Don%20E.%20Wilhelms Don Wilhelms] comparing the Moon's present nearside as it might have appeared in the [http://hdl.loc.gov/loc.gmd/g3196c.wc000003 Middle of the Imbrian Period], [http://hdl.loc.gov/loc.gmd/g3196c.wc000002 End of the Imbrian Period] and [http://hdl.loc.gov/loc.gmd/g3196c.wc000001 Today] are available in the Library of Congress' American Memory Map Collection.<br />
<br /> <br />
==[/Stratigraphic%20List Stratigraphic List]==<br />
A list of the major craters and basins of each stratigraphic age group.<br /> <br /> <br />
==LPOD Articles==<br />
[http://www.lpod.org/index.php?s=stratigraphy How Old?]<br /> [http://www.lpod.org/index.php?s=stratigraphy&paged=2 Lunar Surface Bibliography]<br /> <br /> <br />
==Bibliography==<br />
<br />
* [/Wood%2C%202003 Wood, 2003], p. 53-55<br />
* System/Approximate age: Current USGS stratigraphy as presented in Wilhelm's ''[/Wilhelms%2C%201987 Geologic History of the Moon]''.<br />
* 1962: EM Shoemaker & RJ Hackman: [http://adsabs.harvard.edu/abs/1962IAUS...14..289S Stratigraphic basis for a lunar time scal] in Z Kopal & ZK Mikhailov (editors) ''The Moon''. The foundation of all geologic mapping of Moon and other planets and satellites in the solar system.<br />
* 1964: JF McCauley: “The stratigraphy of the Mare Orientale region of the Moon” in ''Astrogeology Studies Annual program Report'', Aug. 1962-July 1963. Flagstaff. First detailed mapping of a lunar basin made possible by Lunar Orbiter images.<br />
* [http://en.wikipedia.org/wiki/Lunar_geologic_timescale Lunar geologic timescale] ''(Wikipedia)''<br />
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This page has been edited 1 times. The last modification was made by <span class="membersnap">- [http://www.wikispaces.com/user/view/tychocrater [[Image:tychocrater-lg.jpg|16px|tychocrater]]] [http://www.wikispaces.com/user/view/tychocrater tychocrater]</span> on Jun 13, 2009 3:24 pm - ''mgx2''</div></div>Api