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

 

	Jurassic-age sand dunes (Navajo Sandstone, Zion National Park, Utah). These layers reflect ancient sand dune surfaces.
	Sedimentary rocks can tell us a lot about ancient climates. The white layer of rocks are salt deposits, which suggests a hot, dry environment. The red color of the layers beneath it suggests a terrestrial depositional environment. (Sundance Formation, Wyoming).
	Jurassic Kimmerige Clay Formation in southern England. The dark color suggests high organic content, possibly deposited in deeper, more stagnant environments.
	Layers of sedimentary rocks (Sundance Formation, Wyoming). The different colors suggest different environments. The green is marine environment, the white is marginal marine sands, the red is terrestrial. And so in this outcrop, you can see several changes in the sea level and environments.

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updated February 11, 2002

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