The amphibian footprints here described were found by members of the geological faculties of Harvard and Brown universities and are preserved in the paleontological collections of those institutions. The Narragansett Basin (figure 1) in which the tracks were discovered, occupies much of the northern and central parts of Rhode Island and extends northward and northeastward into Massachusetts. Most of the sedimentary reeks of the basin are fresh-water, Carboniferous deposits. They are conspicuously conglomeratic and include much interbedded arkose, sandstone, black shale, and graphitic coal. Although much distorted, the beds contain recognizable fossils. Small amounts of Cambrian sediment underlying the Carboniferous rocks constitute the only other sedimentary deposits older than the Pleistocene that have been recognized in the basin. The fossiliferous Carboniferous rocks are of Pennsylvanian age, and may be Alleghenian.
The following geologic column, after Woodworth,2 shows the Carboniferous formations in the northern part of the basin.