This sedimentary structure formed when sediments were exposed to air.

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Mudcracks form when wet sediment is exposed to air and dries out, causing shrinkage and cracking patterns. Graded beds form when sediments of different sizes settle out at different rates, often due to a sudden event like a storm. Cross-bedding forms when sediments are deposited at an angle to the underlying surface, such as in a sand dune or river channel. Ripples form as a result of wave or current activity and can be seen in both water and wind deposits.

This Sedimentary Structure Formed When Sediments Were Exposed to Air