Paleocene crayfish burrows are present locally in great abundance in the Greater Green River, Hanna, Wind River, and Piceance basins of Wyoming and Colorado. The burrows, which represent crayfish activity in proximal to distal floodplain settings, are assigned to Camborygma symplokonomos , C. eumekenomos , and C. litonomos on the basis of their architectural morphologies. C. araioklados is not present.
Crayfish burrows are part of pedogenically modified channel and overbank deposits.
Swampy conditions prevailed in areas where carbonaceous shales and coals formed, and thus crayfish did not construct deep burrows. The crayfish burrows and associated lithologies suggest a warm, humid, wet-seasonal climate. In the eastern Washakie Basin, the vertical and lateral distribution of burrows and their abundance reflect changes in the paleohydrologic regime over space and time. Burrow depth and overall abundance decreases towards local basin lowlands, where they are rare. In an otherwise lithologically homogeneous, non-variegated deposits, stratigraphically significant surfaces may be indicated only by the tops of burrowed intervals and by other types of paleosols.