EARTH333 Study Guide - Final Guide: Ostracod, Halimeda, Ooid

• School: University of Waterloo
• Department: Earth Sciences
• Course: EARTH333
• Professor: Martin Ross

Document Summary

Inorganic (physical) structures: organic (biogenic) structures, primary (physical) structures: during or shortly after accumulation syn-depositional, secondary (physical/chemical) structures: post depoitional (e. g. form after lithification, bedding structures. Current generated (lower flow regime): cross bedding, ripples. Dish structures: dewatering, convolute bedding: biogenic structures, chemical. Water in phase with bedform, low angle, subtle laminae. Rhythmites: layers of sediment which are laid down with obvious periodicity and regularity; annual processes or seasonal sediment variations. Lamination: small scale sequence of fine layers (<1cm); cyclical changes in sediment supply. Lenticular: alternating mud and sand; during periods of slack water, mud suspended and deposited when water velocity it at zero. *high energy environment, intertidal and supratidal zones (indicates tidal rhythm) Flute marks: tapering end points towards flow; steep end up current. Bed plane: when flow velocities are sufficiently high (fr>1), erosion overwhelms deposition and sediment is transported at bed planes. Antidune: supercritical flow (fr>1), sediments deposited on the upstream side, and eroded on the downstream side.