FIGURE 2. Location of the Spence Shale A. Location in the western United States. B. Topographic relief showing the main mountain ranges and collecting localities. The Wasatch Range contains the High Creek and Blacksmith Fork localities, and the Bear River Range contains Emigration Canyon, Oneida and the type locality Spence Gulch. C. Enlargement of the Wellsville Mountain Range (MH=Miners Hollow, CFC=Calls Fort Canyon, DC=Donation Canyon, CC=Cataract Canyon, AC=Antimony Canyon, HC=Hansen Canyon). Modified from Whitaker et al., 2020.
FIGURE 5. Composition of the Spence Shale fauna by number of genera, comparing the most recent faunal list based on Kimmig et al., 2019; and results from the PBDB. Genera in the PBDB not present on the most recent list are colored in red. The proportion of genera from each taxonomic group is expressed as a percentage above each count.