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
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
Navajo Sandstone, Jurassic Navajo Sandstone, Jurassic DesertDesert
Facies interpretation of Successive units in
Non-Marine SandstonesA&B: trough X-bedsE: Asymmetric scourF: Rippled SS & MS
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
Transect: Permian Reef Transect: Permian Reef MarginMargin
El Capitan, New MexicoEl Capitan, New MexicoSonnenfeld, 1993, AAPG Memoir 57Sonnenfeld, 1993, AAPG Memoir 57
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
Nonmarine Gething FmE.K. Cadomin SandstoneBlairmore equivalent AB
(Bluesky, NEBC)
Marine Fernie Fm ShalesJurassic
Jurassic/Lower CretaceousHiatus marks regional
Tectonic Uplift across WCB
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
Fining upwardsPrograding Delta
Waning Floods Rising Sea Level
1 episode infilling
Serrated, variable hydraulics Bouma C & D or E
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
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!
Destruction of SeawallVero Beach FloridaHurricane JeanneSeptember 2004
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