GEOL 1001 Chapter : Chapter 7
Document Summary
Midterm 1: 9/27, 44 questions-multiple choice, bring a large scantron sheet and pencil, come on time, 50 minute test. About sedimentation: sediments are produced on the earth"s surface as a result of weathering, sediments are transported and become sedimentary rocks after they come to rest, sedimentary rocks give evidence of ancient sedimentary environments where they formed. In the crust: 95% igneous rock, 5% sedimentary rock, on the surface, 25% igneous rock, 75% sedimentary rock. Inorganic processes: organic processes (biochemical origin, common chemical sedimentary rocks. Limestone: most abundant chemical rock, composed chiefly of the mineral calcite, marine biochemical limestones form as coral reefs, coquina (broken shells), and chalk (microscopic organisms). Otherwise organisms such as corals buried by sediment. Precipitation of caco3 aided by photosynthetic bacteria and algae: carbonate shelf, carbonates are well developed in the bahamas banks, transitional (shoreline, beaches-well-sorted sand or gravels, tidal flats, deltas- have a well defined structure (bottomset, topset and foreset beds).
