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.
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11- This image shows how the earth looked at the approximate time the sand ripples were made.
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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.
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10 
11- This image shows how the earth looked at the approximate time the sand ripples were made. 
