Monday, 12 August 2013

Fossil triassic sand ripples

My Daughters found these pieces at the weekend, ime sure there Triassic sand ripples.



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 7 - The larger piece has been discoloured by the river and weathering, and may even have a secondary mineral coating,  but after breaking an under layer free I can say it is certainly Mercia mudstone.
 
 
 8 - The examples  in images 8 - 10 show Triassic fossil sand ripple marks from North America, I have not yet viewed a Triassic example from the UK.


10 

 11- This image shows how the earth looked at the approximate time the sand ripples were made.