Sedimentary Geology Geos 240 – Chapter 6 Facies Analysis

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