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Sedimentary Geology Geos 240 – Chapter 6 Facies Analysis

Sedimentary Geology Geos 240 – Chapter 6 Facies Analysis. Dr. Tark Hamilton Readings from the Holy Book of Tark: (6:1-26) Camosun College. Navajo Sandstone, Jurassic Desert. Facies interpretation of Successive units in Non-Marine Sandstones A&B: trough X-beds E: Asymmetric scour

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Sedimentary Geology Geos 240 – Chapter 6 Facies Analysis

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  1. Sedimentary GeologyGeos 240 – Chapter 6Facies Analysis Dr. Tark Hamilton Readings from the Holy Book of Tark: (6:1-26) Camosun College

  2. Navajo Sandstone, Jurassic Desert

  3. Facies interpretation of Successive units in Non-Marine Sandstones A&B: trough X-beds E: Asymmetric scour F: Rippled SS & MS

  4. Facies interpretation of Successive units in Non-Marine Sandstones (Left) Planar X-beds trough X-beds Asymmetric scour MS Ripple x-stratified & Carbonates (right) Encrinal grainstones Oolite Calcarenites Mudstones

  5. Transect: Permian Reef MarginEl Capitan, New MexicoSonnenfeld, 1993, AAPG Memoir 57

  6. Heirarchy of • Depositional Units • & Hiatus/Diastem • Migrating dunes • Change in • Hydraulic Regime • 3) Lag accumulation • 4) Bar Migration • (autogenic, 1 event) • 5)Channel erosion • (new flood cycle) • 6) Allogenic: • New cycle, tectonic, • Eustatic, climatic

  7. Nonmarine Gething Fm E.K. Cadomin Sandstone Blairmore equivalent AB (Bluesky, NEBC) Jurassic/Lower Cretaceous Hiatus marks regional Tectonic Uplift across WCB Marine Fernie Fm Shales Jurassic

  8. Expansion on Gressley’s vertical Sequences representing changing Environments Mud Drape Ripples Laminated silt Planar X-beds Trough X-beds Erosional scour Vertical Lateral Adjacent environments make vertical successions

  9. Fining upwards Prograding Delta

  10. Waning Floods Rising Sea Level

  11. 1 episode infilling Serrated, variable hydraulics Bouma C & D or E

  12. Modern Point Bars On a meander bend In the Milk River Alberta “The present is the Key to the Past!” Carboniferous (Penn.) Channel cut and fill With Point Bar Sands Alabama

  13. Temple of Serapis, Naples After Lyell’s (1830) Geology Marine borings low on columns mark Volcano-tectonic subsidence From Vesuvio! Re-uplift, despite rising sea levels! A new corollary for Walther: The Past is The Key to the Future. Boom!

  14. Destruction of Seawall Vero Beach Florida Hurricane Jeanne September 2004

  15. Bioturbated Ordovician Dolostones2400 km apart! a) Boothia Peninsula & b) Garrison QuarryArctic Islands versus Winnipeg

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