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Published byCierra Flaxman Modified over 9 years ago
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Structures and other features within sedimentary rocks - clues to the past environments Paleoenvironments Environment of deposition Direction of water or wind Strength or energy of transport agent The “up” side of a sedimentary bed Life that existed and the environment they lived in Climate conditions
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Facies Set of conditions that lead to a particular rock type or group of rocks.
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Chemical Sedimentary Environments –Shallow marine (salt water) areas (usually carbonates and evaporites form) –For example – Limestone, Halite, Gypsum
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Clastic Sedimentary Environments Marine –Beaches, tidal flats, deltas, deep seas, lagoons. Continental –Rivers, deserts, alluvial fans, playa lakes, glacial areas.
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Transgression – ocean advancing over areas that were once dry land (happening today) Regression – opposite, land migrates further out into ocean. (or ocean level dropping)
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Typical ocean sediments beach sand mud carbonate sediments sandmud Dissolved ions
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Typical ocean sediments beach sand mud carbonate sediments Process of transgression sandmud carbonate
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Typical ocean sediments beach sand mud carbonate sediments Process of transgression sandmud carbonate sandmudcarbonate Typical sediment sequence would show Carbonate Mud sand
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