Home | Session 3 | Sedimentary Rock Pg 1, 2, 3, 4, 5, 6, 7, 8, 9

What's in a Sedimentary Rock?

Presented by Carol Tang
California Academy of Sciences

 

	Modern ripples. The ripples are formed in a stream when the water moves over fine grained materials and builds these structures.
	Cambrian-age ripplemarks. These ripples are about 500-million years old, yet they look the same as modern ones, and thus are interpreted to represent the same depositional conditions.
	Triassic-age ripplemarks in cross-section (northern Arizona). Seeing the layers in the ripples allows one to reconstruct the direction of water flow.
	Modern sand dunes (Coral Pink Sand Dunes State Park, Utah).

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updated February 11, 2002

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