GEOL 1001 : Geol 1001 Exam 2 Notes
Document Summary
Larger grain size> higher energy (river flowing faster is able to carry large rocks, the river is usually thin at this point) Smaller grain size> lower energy (river flowing very slow will only be able to carry very small grains like sand, the river is usually very wide at this point) Chemical sedimentary rocks: consist of precipitated material that was once in a solution, precipitation of material occurs by: 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) Carbonates (limestone: product of biological reactions, mineral= calcite, muds, sands, reefs, only develop, 1. In warm (tropical, 30 degrees n or s) water: 2. Otherwise organisms such as corals buried by sediment: 3. Precipitation of ca2co3 aided by photosynthetic bacteria and algae: ex: very well developed in the bahamas, deep (seaward of continental shelves) banks.
