Geologist Wanted

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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, Jamesimg_3205.jpgimg_3206.jpgimg_3181.jpgimg_3180.jpgimg_3180.jpg  

Karisia Walking Safaris