Unit Name: Outram Formation
Unit Type: Lithostratigraphic
Usage: Currently in use
Age Interval: Early Ordovician (488.3 - 471.8 ma)
Age Justification: Trilobites, brachiopods, conodonts, gastropods, sponges, pelecypods, cephalopods, echinoderm fragments and extremely rare graptolites allow recognition of the trilobite zones G and H and the Hesperonomia and Orthidiella brachiopod zones.
Province/Territory: Alberta; British Columbia
Originator: Aitken and Norford, 1967
Mount Wilson (52 deg 00'N, 116 deg 45'W), southwestern Alberta.
Observed thickness range from 170 to 443 m (559 to 1452 ft) within the shelf carbonate facies of the southern Rocky Mountains [Kananaskis Lakes, Calgary, Golden, Brazeau map-areas (82J, K, N, O; 83E)], with the easterly sections being the thinnest and containing virtually no shales. Shales increase westward towards equivalent beds of the Glenogle shales of the graptolitic facies.
Thickness(m): Minimum 170, Maximum 443.
Calcareous siltstones, dark limy shales and siliceous shales, calcisiltites, clotted, nodular and laminated limestones, biocalcarenites, limestone-pebble conglomerates. Grey chert present as nodules, irregular masses and tracery.
Trilobites, brachiopods, conodonts, gastropods, sponges, pelecypods, cephalopods, echinoderm fragments and extremely rare graptolites
Gradational contact with the underlying Survey Peak formation, but regionally apparently virtually synchronous and probably coeval with the McKay-Glenogle contact further west. Gradational and diachronous contact with overlying Skoki Formation. Near the outboard rim of the carbonate shelf the uppermost Outram is younger than elsewhere and is the facies equivalent of the lower part of the Skoki Formation.
Aitken, J.D. and Norford, B.S., 1967. Lower Ordovician Survey Peak and Outram formations, southern Rocky Mountains of Alberta; Canadian Society of Petroleum Geologists, Bulletin of Canadian Petroleum Geology, vol. 15, no. 2 (June), pp. 150-207.
Source: CSPG Lexicon of Canadian Stratigraphy, Volume 4, western Canada, including eastern British Columbia, Alberta, Saskatchewan and southern Manitoba; D.J. Glass (editor)
Contributor: B.S. Norford
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 28 Mar 2014