sedimentary geology geos 240 – chapter 6 facies analysis
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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 - PowerPoint PPT PresentationTRANSCRIPT
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Sedimentary Sedimentary GeologyGeology
Geos 240 – Chapter Geos 240 – Chapter 66
Facies AnalysisFacies Analysis Dr. Tark HamiltonDr. Tark Hamilton
Readings from the Holy Book of Tark: (6:1-26)Readings from the Holy Book of Tark: (6:1-26) Camosun CollegeCamosun College
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Navajo Sandstone, Jurassic Navajo Sandstone, Jurassic DesertDesert
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Facies interpretation of Successive units in
Non-Marine SandstonesA&B: trough X-bedsE: Asymmetric scourF: Rippled SS & MS
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Facies interpretation of Successive units in
Non-Marine Sandstones(Left)
Planar X-bedstrough X-beds
Asymmetric scourMS
Ripple x-stratified&
Carbonates (right)Encrinal grainstonesOolite Calcarenites
Mudstones
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Transect: Permian Reef Transect: Permian Reef MarginMargin
El Capitan, New MexicoEl Capitan, New MexicoSonnenfeld, 1993, AAPG Memoir 57Sonnenfeld, 1993, AAPG Memoir 57
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Heirarchy ofDepositional Units& Hiatus/Diastem1)Migrating dunes2)Change inHydraulic Regime3) Lag accumulation4) Bar Migration(autogenic, 1 event)5)Channel erosion(new flood cycle)6) Allogenic:New cycle, tectonic,Eustatic, climatic
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Nonmarine Gething FmE.K. Cadomin SandstoneBlairmore equivalent AB
(Bluesky, NEBC)
Marine Fernie Fm ShalesJurassic
Jurassic/Lower CretaceousHiatus marks regional
Tectonic Uplift across WCB
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Adjacent environments make vertical successions
Mud Drape
RipplesLaminated silt
Planar X-beds
Trough X-beds
Erosional scour
Expansion on Gressley’s verticalSequences representing changing
Environments
Vert
ical
Lateral
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Fining upwardsPrograding Delta
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Waning Floods Rising Sea Level
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1 episode infilling
Serrated, variable hydraulics Bouma C & D or E
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Modern Point BarsOn a meander bendIn the Milk RiverAlberta
“The present is theKey to the Past!”
Carboniferous (Penn.)Channel cut and fillWith Point Bar SandsAlabama
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Temple of Serapis, NaplesAfter Lyell’s (1830) Geology
Marine boringslow on columns markVolcano-tectonic subsidenceFrom Vesuvio!
Re-uplift,despite rising sea levels!
A new corollary for Walther:
The Past isThe Key to the Future.Boom!
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Destruction of SeawallVero Beach FloridaHurricane JeanneSeptember 2004
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Bioturbated Ordovician Bioturbated Ordovician DolostonesDolostones
2400 km apart!2400 km apart!
a) Boothia Peninsula & b) a) Boothia Peninsula & b) Garrison QuarryGarrison Quarry
Arctic Islands versus Arctic Islands versus WinnipegWinnipeg