Logging Clastics Depth Scale Contacts Grain Size Rock Type Bioturbation Color Fossils and Sedimentary Structures Comments Text: Manual, p. 21-27; Compton, Ch. 11; p. 376-378

Logging Clastics Goals To accurately and graphically represent: Thicknesses of rock types. Detailed, sequential descriptions. Exact stratigraphic position of rock types, sedimentary structures, and fossils.

Logging Clastics http://sealevel2.jpl.nasa.gov/

Logging Clastics

Logging Clastics

Logging Clastics Depth Scale Contacts Grain Size Rock Type Bioturbation Color Fossils and Sedimentary Structures Comments Text: Compton, Ch. 11; p. 376-378

Calculate total depth and appropriate scale / units Depth Scale Calculate total depth and appropriate scale / units Deepest (bottom)  Shallowest (top)

Contacts Mark major contacts Determine nature of contacts (sharp, gradational, erosional)

Contacts S Sharp G Gradational SI Sharp irregular B Gradational-interbedded SC Sharp conformable VS Visibly scoured SD Sharp disconformable BU Burrowed ST Stylolite

Grain Size Determine grain size between major contacts. Plot weathering profile of gravel:sand:mud.

Grain Size Weathering Profile

Logging Clastics Depth Scale Contacts Grain Size Rock Type Bioturbation Color Fossils and Sedimentary Structures Comments Text: Manual, p. 21-27; Compton, Ch. 11; p. 376-378

Rock Type Determine rock type(s) and fill in patterns (see Compton, p. 376-377)

Rock Type (Manual, p. 92)

Bioturbation Determine extent of bioturbation

Color Indicate color with letter symbols. L - Light G - Gray C - Cream M - Medium B - Brown W - White D - Dark R - Red Bk - Black m - Mottled O - Orange Cl - Clear Y - Yellow Gn - Green Bl – Blue Example: LBG = light brownish gray

Logging Clastics Depth Scale Contacts Grain Size Rock Type Bioturbation Color Fossils and Sedimentary Structures Comments Text: Manual, p. 21-27; Compton, Ch. 11; p. 376-378

Fossils and Sedimentary Structures Indicate fossils and sedimentary structures (Manual p. 21a)

Fossils and Sedimentary Structures

Sedimentary Structures Fossils and Sedimentary Structures Carbonate Structures (Manual, p. 94)

Comments Include comments of features not depicted graphically - soil horizons - organics - accessory minerals - cements - porosity

Examples

Examples

Examples

Examples