Earth Sciences 1022A/B Study Guide - Chalcedony, Chert, Clay Minerals

• School: Western University
• Department: Earth Sciences
• Course: Earth Sciences 1022A/B
• Professor: Stephen R Hicock

Document Summary

For sed rocks i could ask for environment of deposition, name a mineral in it, texture, or name the rock. Alluvial fans: stream deposits near the base of mountains; usually poorly sorted and angular (breccia, arkose) Fluvial environment: river deposits of well sorted, rounded sediments (sandstone, shale) Eolian environment: wind deposits which are well rounded, very well sorted, and normally cross-bedded (sandstone) Glacial environment: sediments are very poorly sorted with subangular to subrounded grains. Deltas: complex environment where thick accumulations of siltstone, sandstone, and shale may be deposited. Karst environment: carbonates (calcite, dolomite) extracted from groundwater in limestone caves to form new carbonate deposits (travertine) Restricted basin: evaporites (rock salt, gypsum, potash) Shoreline environment: sediment deposited in beaches, bars, spits, lagoons are clean (well sorted; siltstone, sandstone, shale) Organic reefs: solid structures composed of shells and secretions of marine organisms (highly fossiliferous limestone) Shallow marine environment: cyclic sequences including shale, sandstone, and limestone layers representing changes in sea level.