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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 57 (1973)

Issue: 3. (March)

First Page: 591

Last Page: 595

Title: Environmental Interpretation by Electron Microscopy: Dunvegan Formation, British Columbia: GEOLOGICAL NOTES

Author(s): Monzer S. Shawa (2)

Abstract:

Quartz grains from the Dunvegan Formation in the Liard basin exhibit surface textures such as straight grooves, V-shaped patterns, graded arcs, meandering ridges, and oriented fractures. Straight grooves suggest littoral environments as do V-shaped patterns, but in certain climates the latter may reflect fluvial environments. The remaining features are suggestive of eolian environments. These features, the tabular crossbeds seen in 3-ft sedimentary units which have foresets dipping at an average angle of 25°, and grain-size distribution curves all suggest that the Dunvegan Formation is a continental deposit reworked from a nearshore marine deposit in a regressive cycle.

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