1 / 43

Sedimentary Rock Descriptions and Distractions

Sedimentary Rock Descriptions and Distractions. Description vs Interpretation Rock Descriptions Unit Descriptions Distractions . Text: Manual, p. 13-16, 77-90; Compton, p. 27-31. Rock Descriptions. stratigraphic name. rock type. Rock Descriptions. stratigraphic name

morgan
Download Presentation

Sedimentary Rock Descriptions and Distractions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Sedimentary Rock Descriptions and Distractions • Description vs Interpretation • Rock Descriptions • Unit Descriptions • Distractions Text: Manual, p. 13-16, 77-90; Compton, p. 27-31

  2. Rock Descriptions • stratigraphic name • rock type

  3. Rock Descriptions • stratigraphic name • rock type • color

  4. (Luis Garcia)

  5. Rock Descriptions • stratigraphic name • rock type • color • texture

  6. Rock Descriptions Texture: 1. Grain Size mm Phi () Wentworth Size Class 256 -8 boulder 64 -6 cobble gravel 4 -2 pebble 2 -1 granule _______ 1 0.0 very coarse sand 0.5 1.0 coarse sand 0.25 2.0 medium sand sand 0.125 3.0 fine sand 0.0625 4.0 very fine sand _______ 0.031 5.0 coarse silt 0.0156 6.0 medium silt mud 0.0078 7.0 fine silt 0.0039 8.0 very fine silt  clay

  7. Rock Descriptions Texture: 2. Grain Shape (Roundness) angular grains well rounded grains http://csmres.jmu.edu/geollab/Fichter/SedRx/

  8. Rock Descriptions Texture: 3. Sorting

  9. (AGI, 1999) Rock Descriptions Texture: 4. Arrangement imbrication

  10. Rock Descriptions Texture Interpretations • energy/environment of deposition • transport history

  11. Rock Descriptions • stratigraphic name • rock type • color • texture • grain composition

  12. Rock Descriptions • stratigraphic name • rock type • color • texture • grain composition • porosity • cements

  13. grain porosity cement matrix (M. Campbell) Rock Descriptions

  14. Rock Descriptions • name • rock type • color • texture • grain composition • porosity • cements • bedding

  15. Rock Descriptions Bedding: Types 10 cm laminations Castile Formation, NM (Anderson et al., 1972)

  16. Rock Descriptions Bedding: Types cross-bedding

  17. Rock Descriptions Bedding: Types (AGI, 1999) graded bedding

  18. Rock Descriptions Bedding: Thickness

  19. Rock Descriptions Bedding: Contacts

  20. Rock Descriptions • stratigraphic name • rock type • color • texture • grain composition • porosity • cements • bedding • sedimentary structures

  21. wave ripples Rock Descriptions Sedimentary Structures

  22. Rock Descriptions Sedimentary Structures burrows

  23. Rock Descriptions Sedimentary Structures (AGI, 1999) mudcracks

  24. Rock Descriptions • stratigraphic name • rock type • color • texture • grain composition • porosity • cements • bedding • sedimentary structures • bioturbation

  25. Rock Descriptions Bioturbation (E. McBride)

  26. Rock Descriptions • stratigraphic name • rock type • color • texture • grain composition • porosity • cements • bedding • sedimentary structures • bioturbation • fossils

  27. Rock Descriptions Fossils Trace Fossils Body Fossils

  28. Rock Descriptions Fossils Cretaceous fossils in central Texas http://www.cretaceousfossils.com

  29. UT AUSTIN Interpretation

  30. Rock Descriptions Additional Details for Sandstones: - FMCP:QFR - Clan Name

  31. Rock Descriptions Sandstone Clan Names

  32. Sedimentary Rock Descriptions and Distractions • Description vs Interpretation • Rock Descriptions • Unit Descriptions • Distractions Text: Manual, p. 13-16, 77-90; Compton, p. 27-31, 366-367

  33. Unit Descriptions • stratigraphic name • rock types • brief rock descriptions • - percentages • - thicknesses • - contacts • - interbedding • special features • - soil and vegetation • - topographic expression interbedding gradational sharp

  34. Unit Descriptions cliff slope bench

  35. Sedimentary Rock Descriptions and Distractions • Description vs Interpretation • Rock Descriptions • Unit Descriptions • Distractions Text: Manual, p. 13-16, 77-90; Compton, p. 27-31, 366-367

  36. Distractions Vegetation

  37. (Luis Garcia) Distractions Algae

  38. Distractions Lichen

  39. Distractions Travertine

  40. Distractions Weathering (E. McBride)

  41. Distractions Colluvium (E. McBride)

  42. Distractions Float (E. McBride)

  43. Distractions Dynamite (E. McBride)

More Related