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The AAPG/Datapages Combined Publications Database

CSPG Special Publications

Abstract


Modern and Ancient Examples of Clastic Tidal Deposits: A Core and Peel Workshop, 1989
Pages 60-65

Comparative Sedimentology of Mesotidal (2 to 4 m) Estuarine Channel Point Bar Deposits from Modern Examples and Ancient Athabasca Oil Sands (Lower Cretaceous), McMurray Formation

Derald G. Smith

Abstract

A frequent problem facing clastic sedimentologists is the uncertainty surrounding identification of depositional environments characterized by ancient rocks that display lateral accretion bedding. Are they fluvial, low-energy fluvial-deltaic, or tidal estuarine in origin? Three point bar facies models have been proposed by Smith (1988a) to aid in recognition (Fig. 1). One model shows repetitious sand-mud units in vertical profile and is indicative of mesotidally-influenced (2–4 m tidal range) estuarine channels. This display of core together with block-sized specimens of oil sand from the McMurray Formation serves to illustrate some of the sedimentary features found in mesotidal, estuarine channel, point bar deposits.


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