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

106 views12 pages
Published on 16 Apr 2013
School
University of Waterloo
Department
Earth Sciences
Course
EARTH333
Professor
1. Inorganic (physical) Structures
2. Organic (biogenic) structures
1. Primary (physical) structures: during or shortly after accumulation syn-depositional
2. Secondary (physical/chemical) structures: Post depoitional (e.g. form after
lithification)
1. Bedding structures
-Laminations (<1cm) or horizontal bedding
-Rhythmites
-Bedforms
-Current generated (lower flow regime): cross bedding, ripples
-Current generated (upper flow regime)
-Wave generate structures
-Flaser and lenticular bedding
-Graded bedding
-Imbrication
2. Bedding Plane Structures
-Bottom marks
-Flutes or flute casts, scour marks
-Tool marks
-Surface marks
-current generated
-climate generated
3. Deformation structures
-Load Structures: load casts, flame structures
-Dish Structures: dewatering, convolute bedding
4. Biogenic structures
1. Chemical
-Mineral Segregations
-Solution structures (Stylolite)
2. Physical
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 12 pages and 3 million more documents.

Already have an account? Log in
Lamination: Small scale sequence of fine layers
(<1cm); cyclical changes in sediment supply
Rhythmites: layers of sediment which are laid
down with obvious periodicity and regularity;
annual processes or seasonal sediment variations.
Lenticular: Alternating mud and sand; during
periods of slack water, mud suspended and
deposited when water velocity it at zero.
Lenticular = Mud >> Sand
Flaser = Sand >> Mud
*High energy environment, intertidal and
supratidal zones (indicates tidal rhythm)
Flow Regime
Bedform
Preservation
Potention
Identification
Lower
Lower Plane bed
High
Flat laminae, lack of
current
Lower
Ripple marks
High
Small, cm-scale
Lower
Sand Waves
Medium-Low
Rare, longer wavelength
than ripples
Lower
Dunes
High
Large; meter scale
Lower
Upper Plane bed
High
Flat laminae, aligned
grains
Upper
Antidunes
Low
Water in phase with
bedform, low angle,
subtle laminae
Upper
Pool and Chute
Very low
Mostly erosional features
Cross Bedding
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 12 pages and 3 million more documents.

Already have an account? Log in
Flute Marks: tapering end points towards flow; steep
end up current
Tool marks
Bed Plane: When flow velocities are sufficiently high
(Fr>1), erosion overwhelms deposition and sediment is
Antidune: supercritical flow (Fr>1), sediments deposited
on the upstream side, and eroded on the downstream
side
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 12 pages and 3 million more documents.

Already have an account? Log in

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.

Get OneClass Grade+

Unlimited access to all notes and study guides.

YearlyMost Popular
75% OFF
$9.98/m
Monthly
$39.98/m
Single doc
$39.98

or

You will be charged $119.76 upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.