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Will not display until map scale is 1:577,793 or as the user continues to zoom in. Use the BLM_Natl_PFYC_GeologicFormation_Cache map service to view at scales zoomed out from 1:577,793. Geologic Formations coverage: Contains values for the Potential Fossil Yield Classification (PFYC) for ranking the potential of a geologic unit to produce scientifically significant fossils. It contains polygon boundaries between mappable geologic units and polygon codes for the mappable geologic units. It also contains fields for geologic ages and sort codes for sorting the units by time. Additional fields were added to the source data including earliest geologic age, latest geologic age, PFYC justification, PFYC rank (1-5), and a coded representation for the standardized BLM coloring scheme for PFYC maps. |