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of the Princeton basins with many of the sites now considered the Okanagan Highlands. Modern collecting has centered on the areas around One Mile Creek, Pleasant Valley, and Thomas Ranch.

Age

The age estimates for the Allenby Formation have varied a number of times since the first explorations happened in the 1870s. Shaw (1952) dated the formation as Oligocene, an age followed by Arnold (1955). Half a decade later, the older age of was first suggested, with a younger age being suggested at

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