Chalk made up of plankton shells White cliffs of Dover cliffs along the

Chalk made up of plankton shells white cliffs of

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Chalk- made up of plankton shells White cliffs of Dover (cliffs along the coastside of England ) Chert- rock made of cryptocrystalline quars; Can be found at the bottom of the ocean “In some oceans and shallow seas, large numbers of diatoms and radiolarians live in the water.
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Depositional environments : 1. Terrestrial environments-deposited above sea-level a. Mountain stream environments i. Coarse conglomerate is characteristic of this setting b. Alluvial fan- sediments that pile up at a moutain front i. Sediments become conglomerate and arkose c. Sand-dune environments i. Sandstones d. River environments- channelized sediment transport i. Sand and gravel fill concave up channels ii. Fine sand, silt and clay deposited on nearby flood plains e. Lake-large ponded bodies of water i. Gravel and sands trapped near shore ii. Well-sorted muds deposited in deeper water 2. Marine delta environments- deposited at sea-level a. Delta-sediment accumulates where a river enters the sea i. Sediment carried by the river is dumped when velocity drops 3. Marine delta environments -deposited at or below sea level a. Coastal beach sands b. Shallow marine clastic deposits-finer sands, silts ,muds i. Finer silts and mud turned into siltstone and mudstones c. Shallow water carbonate environments i. Most sediments are carbonates (shell of organisms) ii. Warm, clear, marine water relatively free of clastic sediments iii. Protected lagoons accumulate mud iv. Source of limestones d. Deep marine deposits- fines settle out far from land i. Skeletons and planktonics organisms make chalk or chert ii. Fine silt and clay lithifies into shale (maybe the question where would Slate or Shale form)
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