. The American journal of science and arts . ly weather-worn, so closely resembles the printof a cloven foot as to be continually mistaken for it by the uninitiated. Hitchcock,misled by a report regarding fossil footsteps, undertook a journey of several hun-dred miles—to find nothing but accidental markings on the rock. Vol. xLiii, No. 1.—April-June, 1842, 3 18 Human Foot-Prints in Solid Limestone. portion into small hand specimens. I was thus enabled definitelyto determine the age of the rock. The fossils obtained, proved on examination to be the samespecies which I had often previously obser
. The American journal of science and arts . ly weather-worn, so closely resembles the printof a cloven foot as to be continually mistaken for it by the uninitiated. Hitchcock,misled by a report regarding fossil footsteps, undertook a journey of several hun-dred miles—to find nothing but accidental markings on the rock. Vol. xLiii, No. 1.—April-June, 1842, 3 18 Human Foot-Prints in Solid Limestone. portion into small hand specimens. I was thus enabled definitelyto determine the age of the rock. The fossils obtained, proved on examination to be the samespecies which I had often previously observed at Leavenworthin Indiana, on the Ohio river, and elsewhere, in a rock, the exactgeological position of which I had already satisfactorily ascer-tained. This stratum hes from ten to twenty feet below thelowest members of our true coal measures, and is considered theequivalent of the mountain limestone of Europe. Four species of Producta, the best preserved among those ob-tained from the slab, are here represented, (Fig. 1.) Fig. Producta found in the slab. In the above plate, a a are the under and npper valves of aspecies which I have not seen described; b b represent the exter-nal and internal view of the under valve of another species, also,I believe, undescribed ; nor have I seen d described; c resemblesthe Producta Martini of Soto., but its under valve is much flat-ter and less distinctly striated. I had long since felt assured, from the bearings of our geolo-gical formations, that the limestone of which these are character-istic fossils, formed the bed of the Mississippi at St. Louis ; but Ihad not had an opportunity, during extreme low water, of makinga thorough examination at that place. The discovery of theseProducta confirms in a satisfactory manner my previous views. Human Foot-Prints in Solid Limestone, 19 There is but one corroborative, though not essential evidence,desirable to add to that ah-eady given in proof of the age of thisrock. The uppermost bed
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