When the ice of the last glacial epoch had retreated so far that its front border lay on a northward slope, belonging to the drainage area of the Great Lakes, bodies of water accumulated in front of the ice margin, forming glacio-marginal lakes.
12.
A relict population of great basin sagebrush ( " Artemisia tridentata " ) is visible along Highway 33 at the Bear Canyon trailhead; several populations of this species are left over from the last glacial epoch, when it was more widespread due to the cooler climate then.
13.
The peninsula was not deglaciated until 6, 500 years ago ( 11, 500 years after the Last Glacial Maximum ) and is believed to have been the prehistoric centre from which the vast Laurentide Ice Sheet spread over most of North America during the last glacial epoch.
14.
It is noteworthy that the Clay-with-Flints is developed over an area which is just beyond the limits of the ice sheets of the Glacial epoch, and the peculiar conditions of late Pliocene and Pleistocene times; involving heavy rain, snow and frost, may have had much to do with the mingling of the Tertiary and Chalky material.
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