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Logging Clastics

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:

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Logging Clastics

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  1. 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

  2. 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.

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

  4. Logging Clastics

  5. Logging Clastics

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

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

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

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

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

  11. Grain Size Weathering Profile

  12. 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

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

  14. Rock Type (Manual, p. 92)

  15. Bioturbation • Determine extent of bioturbation

  16. 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

  17. 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

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

  19. Fossils and Sedimentary Structures

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

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

  22. Examples

  23. Examples

  24. Examples

  25. Examples

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