Geology ii

Another indication of the depositional environment for the Old Red Sandstone can be seen on some of the stones in the form of mud cracks and worm burrows.  The mud cracks formed as the finer, muddy sediment dried out in the shallow water at the edge of the lake or near to where rivers fed into the lake.  Often these layers of mud are sandwiched between the sandier layers which themselves show small ripple marks with a distinct asymmetry.  This shows us that there was moving water, most likely in the form of a river, depositing these sediments.

Cross-bedding showing section through a ripple.

Cross-bedding showing section through a ripple.

Mud crack on the stones.

Mud crack on the stones.

 

 

 

 

 

 

 

 

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