A knowledge of the vertebrate assemblage of a past geologic period based solely on footprint records would be very meager. However, footprint records add to the picture to the extent of emphasizing the variety of air-breathing vertebrates, and such records are particularly welcome when they come from periods in which the skeletal record is scanty. In the paleontological collections of the University of Missouri are several foot‐print records that are of value from this standpoint. They furnish additional data on the variety of life in the Pennsylvanian, the Triassic, and a part of the Cretaceous from which few vertebrates are known.
TENSLEEP SANDSTONE OF WESTERN WYOMING
Two slabs of footprints were quarried from large blocks of the Tensleep sandstone of western Wyoming by the 1929 geological field party of the University of Missouri. The first slab, which has been selected as the type, was found by Donald . . .