This image shows layered sedimentary deposits in Candor Mensa, a broad plateau of thickly stacked sedimentary rocks in Candor Chasma, part of the giant troughs of Valles Marineris.
Valles Marineris is a system of tectonic depressions formed by down-dropping faults; the floors are among the lowest points on the surface of Mars, and may have once held lakes. Some sites show evidence for streams or rivers. The troughs may have also been sites of volcanic activity.
Currently, the deep floors contain massive deposits of bright sedimentary rocks. Some of the deposits are several kilometers thick, and have diverse composition and appearance. They were probably formed by many different processes in different environments.
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Over at In The Agora, in the comments on Eric's post replying to me about slavery and the Bible, a commenter named lawyerchik1 has cut and pasted a bunch of arguments for a global flood from the ICR.
I bet I'm not the only geologist who always wants to list "time machine" in the b
I made a promise to myself that every month, I would at least look through the abstracts on my RSS feeds and note interesting articles that I wanted to find time to read. So now it's May 30, and I'd better do it before the June issues come out.