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Stratigraphy-sedimentology

An introduction to common stratigraphic and sedimentological tasks, and some basic theory

 

Stratigraphy and Sedimentology

                  

Posts here present an introduction to common stratigraphic and sedimentological tasks, such as recognizing and measuring sedimentary structures and stratigraphic sections in the field, describing sediments and sedimentary rocks, and the basic principles of sedimentation.

See also the companion page  structural geology and mapping

 

Beds and bedding planes

Determining stratigraphic tops

Measuring a stratigraphic section

Identifying paleocurrent indicators

Measuring and representing paleocurrents

Crossbedding – some common terminology

The hydraulics of sedimentation: Flow Regime

How do we identify a basin margin?

Sediment transport: Bedload and suspension load

Fluid flow: Froude and Reynolds numbers

Fluid flow: Shields and Hjulström diagrams

Fluid flow: Stokes Law and particle settling

Beach microcosms as fan delta analogues

 

 

Invertebrate morphology for sedimentologists

Bivalve morphology for sedimentologists

Trilobite morphology for sedimentologists

Gastropod shell morphology for sedimentologists

Cephalopod morphology for sedimentologists

Brachiopod morphology for sedimentologists

Echinoderm morphology for sedimentologists

Coral morphology for sedimentologists

Graptolite morphology for sedimentologists

 

Sandstone lithofacies

Sedimentary lithofacies – An introduction

Ripple lithofacies: Ubiquitous bedforms

Climbing ripple lithofacies

Ripple lithofacies influenced by tides

Tabular and trough crossbed lithofacies

Laminated sandstone lithofacies

Low-angle crossbedded sandstone

Hummocky and swaley cross-stratification

Antidune lithofacies

Lithofacies beyond supercritical antidunes

Subaqueous dunes influenced by tides

The three pycnals: Hypo-, homo-, and hyper

Storms and storm surges: Forces at play

Evolving tempestite lithofacies models

Graded-bedding lithofacies

 

Gravel lithofacies

Introducing coarse-grained lithofacies

Crossbedded gravel lithofacies

Beach and shoreface gravels

Debris flow lithofacies

The lithofacies of mountain streams

 

Three posts on tempestites:

3 Evolving tempestite lithofacies models

2 Storm surges and tempestites

1 Storms and storm surges: Forces at play

 

Seagrass, mangrove, and salt marsh lithofacies

Seagrass meadows and ecosystems

Seagrass lithofacies in the rock record

Mangrove ecosystems

Mangrove lithofacies

Salt marsh lithofacies

Geological models

Geological models: An introduction

Model dimensions and dimensional analysis

Analogue models

Analogue models of faults: scaling the materials

Strike-slip analogue models

Self-organization, autocyclicity, and the rock record

You might also want to check out …

A time-line for the first 4.6 billion years

The age of the Earth

Interpreting the ancient Earth

Uniformity and James Hutton

Trace fossils

Unconformities

Fossils, isotopes and geological time

A submarine channel complex

Archives
Categories
dip and strike compass
Measuring dip and strike
sandstone classification header
Classification of sandstones
Calcite cemented subarkose, Proterozoic Altyn Fm. southern Alberta
Sandstones in thin section
poles to bedding great circles
Stereographic projection – poles to planes
froude-reynolds-antidunes-header-768x439-1
Fluid flow: Froude and Reynolds numbers
Stokes Law for particle settling in a schematic context of other fluid flow functions
Fluid flow: Stokes Law and particle settling
sedimentary-basins-distribution-1-768x711
Classification of sedimentary basins
Model are representational descriptions are written in different languages - diagrammatic, descriptive, mathematical, and conceptual. They commonly contain variables and dimensionless quantities that permit quantitative analysis of the physical systems the models represent.
Geological models
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