Abstract

Disarticulated skeletal elements of American? toad (Bufo sp., ?B. americanus), grouse (Canachites canadensis or Bonasa umbellus), varying hare (Lepus americanus), cottontail rabbit (Sylvilagus floridanus), large pika (Ochotona sp.), woodland deer mouse (Peromyscus maniculatus), muskrat (Ondatra zibethicus), little brown bat (Myotis lucifugus), and striped skunk (Mephitis mephitis) have been identified from a travertine cemented dolomite breccia from a demolished cave in the Lockport Formation of the Niagara Escarpment west of Milton, Ontario. Pollen grains recovered from the matrix show that spruce (Picea sp.), pine (Pinus sp.), birch (Betula sp.), oak (Quercus sp.), elm (Ulmus sp.), lime (Tilia sp.), and black walnut (Juglans nigra) coexisted with the fauna. The flora resembles that radiocarbon dated to between 10 500 and 9500 years BC from nearby Crawford Lake. However, the presence of Ochotona sp. suggests a possible Illinoian age for the deposit on the known occurrences of Illinoian Ochotona in Maryland and West Virginia, and the record of Illinoian giant pikas in Alaska and eastern Asia.

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