Tag Archives: sinuous ridge

HiRISE image: sinuous ridges and meanders

Posted on January 30, 2014 by rburnham

These ridges are thought to be old river channels, but wind erosion has created inverted topography. What was low (the channel bottoms) was more resistant to erosion, so now it is relatively high. In a closeup image, we see a … Continue reading →

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Aeolis Serpens, Mars’ longest sinuous ridge, is an ancient riverbed

Posted on May 17, 2013 by rburnham

A linear ridge that winds for more than 200 kilometers (120 miles) through part of South Australia was a river channel roughly 10 million years ago. After the paleoriver stopped flowing, silica-rich groundwater seeped into the riverbed, cementing its sediments.

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