Difference between revisions of "March 17, 2011"

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=What is Hidden Below the Surface?=
 
=What is Hidden Below the Surface?=
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<em>image by [mailto:gtarsoudis@gmail.com George Tarsoudis]</em><br />
 
<em>image by [mailto:gtarsoudis@gmail.com George Tarsoudis]</em><br />
 
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The right quarter of George's mosaic is mare, and ponds of similar material have leaked out across the image. <br />
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The right quarter of George's mosaic is mare, and ponds of similar material have leaked out across the image.  
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The smooth, but not dark material that covers most of the rest of the region is called the Cayley Formation, named <br />
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The smooth, but not dark material that covers most of the rest of the region is called the Cayley Formation, named  
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for the 14 km wide simple crater cut in half by the bottom edge of the image. Although it was never sampled by <br />
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for the 14 km wide simple crater cut in half by the bottom edge of the image. Although it was never sampled by  
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Apollo missions the interpretation has been that the Cayley material is ejecta from the formation of the Imbrium<br />
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Apollo missions the interpretation has been that the Cayley material is ejecta from the formation of the Imbrium
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Basin. Because of its smoothness the idea is that it was ejected in a fluidized condition and that it flowed like<br />
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Basin. Because of its smoothness the idea is that it was ejected in a fluidized condition and that it flowed like
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a liquid when it hit the surface. I am not questioning the interpretation but wondering what is under the Cayley?<br />
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a liquid when it hit the surface. I am not questioning the interpretation but wondering what is under the Cayley?
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Along the southern part of the image residual rims of craters are visible, reminders that this is the northern edge<br />
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Along the southern part of the image residual rims of craters are visible, reminders that this is the northern edge
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of the high cratered southern highlands. To the north are other relict large craters draped by a more pasty type<br />
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of the high cratered southern highlands. To the north are other relict large craters draped by a more pasty type
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of basin ejecta. The area from Hyginus, along the Ariadaeus Rille, to Mare Tranquillitatis has fewer crater rims <br />
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of basin ejecta. The area from Hyginus, along the Ariadaeus Rille, to Mare Tranquillitatis has fewer crater rims  
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and seems more uniformly flat. For the surface to be that way, the Cayley Formation must be thick enough to fill <br />
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and seems more uniformly flat. For the surface to be that way, the Cayley Formation must be thick enough to fill  
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in all low spots and submerge many high ones, or something had already smoothed the area. There is no hint<br />
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in all low spots and submerge many high ones, or something had already smoothed the area. There is no hint
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that a small basin/large crater originally existed where the Hyginus flatness is. And the lack of dark halo craters <br />
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that a small basin/large crater originally existed where the Hyginus flatness is. And the lack of dark halo craters  
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is evidence that mare rocks don't underlie the Cayley - or else it is fairly thick. (Although mare is under [http://the-moon.wikispaces.com/Dionysius Dionysius],<br />
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is evidence that mare rocks don't underlie the Cayley - or else it is fairly thick. (Although mare is under [https://the-moon.us/wiki/Dionysius Dionysius],
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just at the edge of Tranquillitatis). So something removed much of the pre-existing topography in the area now <br />
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just at the edge of Tranquillitatis). So something removed much of the pre-existing topography in the area now  
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covered by the Cayley Formation but I don't know what. <br />
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covered by the Cayley Formation but I don't know what.  
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<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br />
 
<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br />
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<strong>Related Links</strong><br />
 
<strong>Related Links</strong><br />
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Rükl plate [http://the-moon.wikispaces.com/R%C3%BCkl+34 34]<br />
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Rükl plate [https://the-moon.us/wiki/R%C3%BCkl_34 34]<br />
 
George's [http://www.lunar-captures.com/ Lunar Captures] website<br />
 
George's [http://www.lunar-captures.com/ Lunar Captures] website<br />
 
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<br />
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<hr />
 
<p><b>Yesterday's LPOD:</b> [[March 16, 2011|A Hill of Speculations]] </p>
 
<p><b>Yesterday's LPOD:</b> [[March 16, 2011|A Hill of Speculations]] </p>
 
<p><b>Tomorrow's LPOD:</b> [[March 18, 2011|Young And Old]] </p>
 
<p><b>Tomorrow's LPOD:</b> [[March 18, 2011|Young And Old]] </p>
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Latest revision as of 17:51, 13 October 2018

What is Hidden Below the Surface?

LPOD-Mar17-11.jpg
image by George Tarsoudis

The right quarter of George's mosaic is mare, and ponds of similar material have leaked out across the image. The smooth, but not dark material that covers most of the rest of the region is called the Cayley Formation, named for the 14 km wide simple crater cut in half by the bottom edge of the image. Although it was never sampled by Apollo missions the interpretation has been that the Cayley material is ejecta from the formation of the Imbrium Basin. Because of its smoothness the idea is that it was ejected in a fluidized condition and that it flowed like a liquid when it hit the surface. I am not questioning the interpretation but wondering what is under the Cayley? Along the southern part of the image residual rims of craters are visible, reminders that this is the northern edge of the high cratered southern highlands. To the north are other relict large craters draped by a more pasty type of basin ejecta. The area from Hyginus, along the Ariadaeus Rille, to Mare Tranquillitatis has fewer crater rims and seems more uniformly flat. For the surface to be that way, the Cayley Formation must be thick enough to fill in all low spots and submerge many high ones, or something had already smoothed the area. There is no hint that a small basin/large crater originally existed where the Hyginus flatness is. And the lack of dark halo craters is evidence that mare rocks don't underlie the Cayley - or else it is fairly thick. (Although mare is under Dionysius, just at the edge of Tranquillitatis). So something removed much of the pre-existing topography in the area now covered by the Cayley Formation but I don't know what.

Chuck Wood
Kaguya Atlas published!

Technical Details
Orion Optics Newtonian Telescope 250mm @ f/6.3, Unibrain camera Fire-i785, filter Baader Neodymium, barlow 3X, Registax 6 beta.

Related Links
Rükl plate 34
George's Lunar Captures website

Yesterday's LPOD: A Hill of Speculations

Tomorrow's LPOD: Young And Old

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