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

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Presentation transcript:

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

Navajo Sandstone, Jurassic Desert

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

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

Transect: Permian Reef Margin El Capitan, New Mexico Sonnenfeld, 1993, AAPG Memoir 57

Heirarchy of Depositional Units & Hiatus/Diastem 1)Migrating dunes 2)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

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

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

Fining upwards Prograding Delta

Waning Floods Rising Sea Level

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

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

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!

Destruction of Seawall Vero Beach Florida Hurricane Jeanne September 2004

Bioturbated Ordovician Dolostones 2400 km apart! a) Boothia Peninsula & b) Garrison Quarry Arctic Islands versus Winnipeg