1. Readings from Sediments & Basins: (8:1-67)
Sedimentary Geology Geos 240 – Chapter 8 Depositional Environments Part 1 Introduction, Fluvial & Coastal
Dr. Tark Hamilton
Readings from Sediments & Basins: (8:1-67)
Camosun College

2. Great Barrier Back Reef, Queensland
Branching Corals & Carbonate Sand

3. Depositional Environments

4. The Peace River, Ft. St. John, NE B.C.

5. Gravel-Sand-Silt-Clay
Four
Decreasing
Gradient:
1>2>3>4 2 3 4
Gravel-Sand-Silt-Clay 1

6. Sandy Braided River Model Based on South Saskatchewan
Bars Persist for decades
Flow & Aggradation
Lateral Aggradation

7. Anastomosed River Model Based on Cumberland Marshes, East Central Saskatchewan-Manitoba
Stable Vegetated Marsh
Flow Direction, Channel Sands
Crevasse Splay Deposit

8. Cutbank, Upwards Fining, Cenozoic

9. Narrow Sand Body, Permian Anastomosed River, NM

10. Point Bar Sand with Lateral Accretion & Mud Fill

11. Cutbank, Arid Fluvial Sys. AZ

12. Cutbank, Arid Fluvial Sys. AZ

13. Cutbank, Carboniferous Channel Sand, KY
Collapsed & Rotated Block
Of Sandstone that fell
Into the Channel

14. Cutbank, Sand on Sand, Jurassic AZ

15. Box Canyon Cut into Basal Triassic Unconformity AZ

16. Box Canyon Cut into Basal Triassic Unconformity AZ

17. Caliche Paleosol, Triassic Redbeds, Spain

18. Caliche Paleosol, Triassic Redbeds, Spain

19. Interbedded Floodplain Siltstones & Musdtones w/Channel

20. Thin Floodplain Muds over Sheet Sand, Devonian, Arctic Canada
Upwards
Fining

21. Modern Ergs: Eolian Deserts Tropic of Cancer & Capricorn ~25°N & S (Why Here?) Continental Interiors & Rainshadows (Find 2)

22. Facies Model for an Erg (Desert)

23. Cyclic Stratigraphy of Dunes
Climate, Sea Level, WT Change
MBS: Deflation, Lags, Ventifacts, Desert Varnish, Blow Outs, Downlap

24. Stream (WT) Cutting Dunes, Colorado

25. Interdune Pond: Mudcracks w/Silt, Gobi

26. Slumped Bed on Face of Dune, Navajo Sandstone, Arizona

27. The Barchan Dune that ate the Truck, Gobi

28. Deflation Surface Ventifacts w/Desert Varnish Gobi

29. Deflation Surface Comet Marks: Sand in Lee, Gobi

30. The Ventifact: Wind Faceted Stone

31. Deflation Surface w/Ventifacts, Triassic Spain

32. Deflation Surface w/Ventifacts, Permian Scotland

33. Lacustrine Deposits

34. Lacustrine Oil Shales Green River Fm, Eocene WY

35. Varved Glacio-lacustrine Clay/Silt, Pleistocene, ON
Dropstone
(see notes)
Compression and piercing of beds beneath the dropstone, drape above it.

37. Hypothetical Coastal Depositional System Facies

39. South Carolina Barrier Islands Spit Bars, Tide Flats

40. South Carolina Barrier Islands Estuary

41. Galveston Island & Matagordia Bay, Texas What are the green curves?
What is this feature?

42. Dune & Beach, South Padre Island (Galveston, Texas)

43. Turbulent Dispersion of Shelf Muds after Hurricane Ida MODIS 10/10/09
Hurricane Ida came ashore to the east making landfall in Alabama and Florida a few hours earlier. This sediment dispersion and re-suspension is due to wind and waves outside of the main storm area! Secondary sediment sources are the brown muds from the Mississippi (middle right edge) and coastal erosion of mud and sand near shore. The green colour is due to phytoplankton blooms enhanced by fertilizer runoff: nitrates, iron etc.
Ida’s
Path
See Notes

44. The End of Part 1!