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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