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The AAPG/Datapages Combined Publications Database
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Abstract
Symposium Abstracts
A Storm-Generated Sequence in the Glauconitic Sandstone, Mannville Group, Southern Alberta: Abstract
Abstract
Storm deposits, characterized by ‘turbidite’ conglomerates and (?) hummocky-bedded, fine-grained sandstone, have been recognized in a well (Jenner 12-32-20-8W4) in the subsurface Glauconitic sandstone unit of the Mannville Group, Southern Alberta.
Storm-generated sedimentation units occur above a bioturbated mudstone (offshore mud) and below a gravelly sandstone with parallel, cross- or low-angle bedding (foreshore sand). These units are of two types:
Type 1. Cyclical units, 30 to 40 cm thick, with the following divisions:
(iv) bioturbated mudstone (top);
(iii) cross-laminated, very fine-grained sandstone;
(ii) planar or (?) hummocky - stratified, fine-grained sandstone;
(i) conglomerate, lying on a scoured surface (base).
Type 2. Conglomerates, 10 to 15 cm thick, exhibiting a graded basal part and a parallel- or cross-laminated top part, alternating with parallel-bedded, coarse-grained sandstones (10-20 cm thick).
Type 1 deposits are believed to have been deposited by storm-ebb currents and storm waves and the type 2 by storm-generated turbidity currents.
Acknowledgments and Associated Footnotes
1 Institute of Sedimentary and Petroleum Geology, 3303 - 33rd Street N.W., Calgary, Alberta T2L 2A7
Copyright © 2009 by the Canadian Society of Petroleum Geologists