Figure 3 | Scientific Reports

Figure 3

From: Impact-related microspherules in Late Pleistocene Alaskan and Yukon “muck” deposits signify recurrent episodes of catastrophic emplacement

Figure 3

Photographs taken in 1941 at the Cripple Creek mine located just west of Fairbanks, Alaska. (a) Frank C. Hibben on August 3, at right, holding a broken mammoth’s humerus (Mammuthus primigenius) and an unidentified person holding bison skull fragments (Bison priscus) at one of Otto Geist’s fossil discard piles (see Supplementary Information, “Historical note”). Maxwell catalog no.: Hibben_Ak41_neg15bw. (b) Otto Geist on August 4 standing next to a runoff stream from hydraulic jets (monitors) used to thaw and wash away the muck overburden (background), and expose the gold-bearing gravels (see Fig. 2). Note the logs, branches, and other plant material protruding from the fined-grained frozen mucks. Maxwell catalog no.: Hibben_Ak41_neg16bw. Both photographs are from the Frank C. Hibben Photograph Collection, courtesy of the Maxwell Museum of Anthropology, University of New Mexico.

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