Solander Point, Sol 3387 - 3511 (August 4, 2013 - December 12, 2013) |
Solander Point, Sol 3387 - 3511 (August 4, 2013 - December 12, 2013) |
Aug 4 2013, 08:39 PM
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Senior Member Group: Moderator Posts: 3431 Joined: 11-August 04 From: USA Member No.: 98 |
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Sep 8 2013, 07:16 AM
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Senior Member Group: Members Posts: 1045 Joined: 17-February 09 Member No.: 4605 |
I think the following paper goes a little deeper into explanation of the bench Phil: http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2294.pdf
To quote, A rock unit ringing the base of Cape York was investigated at Deadwood and again at Grasberg, at Cape York’s northern tip. This unit is bright-toned with platy, millimeter-scale layering. Its elemental composition is intermediate between the rocks of the Shoemaker formation and the Burns Formation, with elevated Ca and S concentrations, interpreted as a clastic sedimentary rock formed by erosion of the Shoemaker Formation and later modified to create the S enrichment. Squires also tributed the bench to shoemaker detritus in his Nature article Ancient Impact and Aqueous Processes at Endeavour Crater, Mars although he differentiated between inner and outer bench material (outer being Burns formation onlap which is quite pronounced to the west of CY). Identifying the bench as eroded rim breccia material seems an important call in defining Endeavour, confirming that the Burns unit was deposited a long time after the impact, when the rim had eroded away. |
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