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Sedimentary Geology Geos 240 – Chapter 4 The Stratigraphic-Sedimentological Database

Sedimentary Geology Geos 240 – Chapter 4 The Stratigraphic-Sedimentological Database. Dr. Tark Hamilton Camosun College. Hoodoos: Late Cretaceous Clastics Edmonton Group: Drumheller, Alberta. uK Edmonton Group. “Pierre”. Skip to 13. uK Edmonton Group (Drumheller).

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Sedimentary Geology Geos 240 – Chapter 4 The Stratigraphic-Sedimentological Database

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  1. Sedimentary GeologyGeos 240 – Chapter 4The Stratigraphic-Sedimentological Database Dr. Tark Hamilton Camosun College

  2. Hoodoos: Late Cretaceous ClasticsEdmonton Group: Drumheller, Alberta

  3. uK Edmonton Group “Pierre” Skip to 13

  4. uK Edmonton Group (Drumheller)

  5. uK Edmonton Group (Drumheller)

  6. uK Edmonton Group (Drumheller)

  7. uK Edmonton Group(Drumheller)

  8. uK Edmonton Group (Drumheller)

  9. uK Edmonton Group (Drumheller) Stratigraphy is interpreted from, lithology, sedimentary structures, fossils to obtain facies and the reasons behind stratigraphic breaks and changes.

  10. uK Edmonton Group (Drumheller)

  11. uK Edmonton Group (Drumheller)

  12. Field Descripton Chart:Lamination, Grain Size, Shape, Sorting

  13. Sorting &Gradingin Sandstones & Conglomerates

  14. Table 4.2: Stratification Thicknesses • Bedding Description Range Symbol • Very Thickly B edded > 1 m VTK • Thickly Bedded 30-100 cm THK • Medium Bedded 10-30 cm M • Thinly Bedded 3-10 cm THN • Very Thinly Bedded 1-3 cm VTN • Thickly Laminated 0.3-1 cm TKL • Thinly Laminated <0.3 cm TNL

  15. Bedding & Lamination

  16. THN ?

  17. M ? X-beds

  18. Cross- Stratification in Outcrop & Drill Core

  19. Downwards concave crossbeds Truncated at their base (overturned drag fold beneath thrust)

  20. Soft Sediment Deformation of Crossbedding

  21. Bounding Surfaces, Channels, Scour & Second Order Cyclesin Outcrop

  22. Tippecanoe Sauk

  23. Scour by turbidity currentserodes shelf edges &forms submarine canyons

  24. Stromatoporoids exposed on a

  25. Soft Sediment Deformation Lode Casts & Fluting Occurs when denser coarser Sands or turbidites load Soft superhydrous Muds Intraformational Breccias Require post depositional Dissolution & Collapse

  26. Vortex erosion in a turbidity canyonB)Underside of bed showing flutes & scour around pebbleC)Flutes at the base of a fluvial channel sandstone

  27. Tool Markings:Groove Casts below a turbidity current

  28. Load Structures: Ball & Pillow

  29. Soft Sediment Deformation StructuresfromSyndepositional Collapse, Gravity Sliding or Earthquakes

  30. ClasticDykes

  31. Dessication Cracks inPlan view & Cross Section Mudcracks often infill with sands or even gravels as sedimentation resumes. The Bishop Tuff has compactional gas cracks filled by glacial till!

  32. Fossils • Body Fossils: molds, permineralization • Macrofossils: petrified wood, cephalopods, coral, clams, archeopterix, leaf impressions… • Microfossils: algal spores, palynomorphs, dinoflagellates, foraminifera, diatoms, coccoliths • Trace Fossils: grazing trails, footprints, burrows, ophiomorpha, beaver dams!

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