Geologist Wanted
Category: Issues | Date: Apr 26 2009 | By: tumaren
Here are a series of Rocks that I photographed on a recent trip down the Ewaso Nyiro River. I would appreciate any ideas anyone might have about any of these structures as well as some clue as to how they were formed. I know that our area has experienced a great deal of interesting geologic activity associated with the the movement and spread of the rift valley but i dont know enough about it. Thanks for any ideas. Cheers, James
Tags: Kenyan Geology, Rift Valley Geology
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4 Responses to “Geologist Wanted”
paula, on 27 Apr 2009
Wow, looks intresting ….almost like it’s formed by water - dissolving and redepositing minerals. I’m going to put it on twitter and see if we get any response..
pat, on 04 May 2009
Caused by a common form of erosion and redeposition of limestone
Luca, on 01 Jun 2009
Hello - that looks like travertine to me.
Travertine is a carbonatic sedimentary rock that forms around hot springs; hot water with dissolved carbonates emerges on the surface and rapidly cools, this determines the precipitation of the carbonates that form the travertines.
To confirm what they are you should take a hammer and crack some pieces of the rock and observe very carefully for the presence of small fossils (eg small mollusks, parts of plants), these are almost always present in travertines. Moreover, the rock is carbonatic, so if you crush it and add a few drops of a strong acid (eg muriatic acid HCl) it will produce lots of small bubbles.
In any case, most likely there was a hot spring there some million years ago and that is the place where you should look for fossils - you are in the Rift Valley!
Mohan Doss, on 19 Jun 2009
actually it formed in calc rich rock areas due to capillary movement. it is a secondary sedimetary deposit.The main reason is evaporation.
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