Outram Formation
Stratigraphic range: Early Ordovician ~485–470 Ma

PreЄ

Type| Formation
Underlies| Skoki Formation
Overlies| Survey Peak Formation
Thickness| Up to 443 metres (1453 ft)[1]
Lithology
Primary| Limestone, siltstone
Other| Shale, chert
Location
Coordinates|  [ ⚑ ] : 51°52′54″N 116°52′31″W﻿ / ﻿51.88167°N 116.87528°W﻿ / 51.88167; -116.87528﻿ (Outram Formation)
Region| Canadian Rockies
Country| Canada
Type section
Named for| Mount Outram
Named by| J.D. Aitken and B.S. Norford[2]

The Outram Formation is a stratigraphic unit of Early Ordovician age that is present on the western edge of the Western Canada Sedimentary Basin in the Canadian Rockies of Alberta and British Columbia.[3] It was named for Mount Outram in Banff National Park by J.D. Aitken and B.S. Norford in 1967.[2] The Outram Formation is fossiliferous and includes remains of trilobites and other marine invertebrates, as well as stromatolites and thrombolites.[1][2]

## Contents

* 1 Lithology and deposition
* 2 Distribution and stratigraphic relationships
* 3 Paleontology
* 4 References

## Lithology and deposition

The Outram Formation formed as a shallow and at times emergent marine shelf along the western shoreline of the North American Craton during Early Ordovician time.[2][3] It consists primarily of nodular limestone, calcareous quartzose siltstone, limestone pebble-conglomerate, and brown shale. Nodules of grey chert occur throughout the formation.[1][2]

## Distribution and stratigraphic relationships

The Outram is present in the Rocky Mountains of Alberta and British Columbia. Its thickness and shale content increase toward the west.[1][2] It overlies the Survey Peak Formation and underlies the Skoki Formation.[4] Both contacts are gradational.[1][2]

## Paleontology

The Outram Formation contains several genera of trilobites, as well as brachiopods, conodonts, gastropods, sponges, echinoderms, bivalves, gastropods, stromatolites, thrombolites, oncolites, rare graptolites, and others.[1][2]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Glass, D.J. (editor) 1997. Lexicon of Canadian Stratigraphy, vol. 4, Western Canada including eastern British Columbia, Alberta, Saskatchewan and southern Manitoba. Canadian Society of Petroleum Geologists, Calgary, 1423 p. on CD-ROM. ISBN 0-920230-23-7.
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Aitken, J.D. and Norford, B.S. 1967. Lower Ordovician Survey Peak and Outram formations, southern Rocky Mountains of Alberta. Bulletin of Canadian Petroleum Geology, vol. 15, p. 150-207.
3. ↑ 3.0 3.1 Slind, O.L., Andrews, G.D., Murray, D.L., Norford, B.S., Paterson, D.F., Salas, C.J., and Tawadros, E.E., Canadian Society of Petroleum Geologists and Alberta Geological Survey (1994). "The Geological Atlas of the Western Canada Sedimentary Basin (Mossop, G.D. and Shetsen, I., compilers), Chapter 8: Middle Cambrian and Early Ordovician Strata of the Western Canada Sedimentary Basin". http://ags.aer.ca/reports/atlas-of-the-western-canada-sedimentary-basin.htm. Retrieved 2018-07-13.
4. ↑ Alberta Geological Survey. "Alberta Table of Formations, May 2019". Alberta Energy Regulator. https://ags.aer.ca/document/INF/Table_of_Formations_2019.pdf. Retrieved 24 March 2020.

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