Sedimentary Rocks. What is a sedimentary rock?. Sedimentary rocks are products of mechanical and chemical weathering They account for about 5 percent (by volume) of Earth’s outer 10 kilometers Contain evidence of past environments Provide information about sediment transport
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These fish tell us the Wyoming climate
50 million years ago.
Sedimentary Rock made of fine-grained mudstone.
Organic—remains of plants and animals are deposited in thick layers
Mineral crystals are made as the shallow water that has flooded the bottom of Death Valley evaporates. Click on image for full size (66K JPG)Courtesy of Martin Miller, University of Oregon
Sorting depends on properties of the depositing agent
Glacier deposit – poorly sorted
Sand dune – well sorted
Evaporites (Halite and Gypsum)
Narracoorte Caves, southeastern SA
The Queen’s Throne- Utah
Stalactites (of mineral calcite). Biochemical and inorganic sedimentary limestone rocks.
Dipping sedimentary layers of rock, Rocky Mountains, Canada.