July 9, 2012

Monday Geology Picture: Ripple Marks in Sandstone of the Cape Fold Belt, South Africa

Posted by Evelyn Mervine

Ripple marks, with hammer for scale.

This past Saturday my husband and I visited the Robertson area, which is about an hour and a half drive from Cape Town, South Africa. We went to visit my husband’s grandmother and also to meet up with a very nice woman named Francie, who emailed me several months ago about some rocks on her property outside of Robertson. Francie asked if she could send me some rock pictures, and I told her I’d do better and come look at her rocks. Saturday morning we finally met up with Francie as well as her husband and daughter at their property, which is delightfully called “Gnoem Gnoemskloof” (pronounced like “Noom Noomskloof”). Gnoem Gnoemskloof is located in the Cape Fold Belt, so the rocks we saw on the property were all sandstones. There were some beautiful sandstones on the property. I’ll be sharing some more pictures and geologic information from our visit to Gnoem Gnoemskloof in the future. For today, I thought I would share this neat picture of ripple marks which have been preserved in the sandstone.