. Elements of geology : a text-book for colleges and for the general reader. Geology. FAUNA OF THE CARBONIFEROUS AGE. 401 " We thus learn," says Dana, " that there existed in the region about Pottsville, at that time, a mud-flat on the border of a body of water; that the flat was swept by wavelets, leaving ripple-marks; that the rip- ples were still fresh when a large amphibian walked across the place; that a brief show- er of rain follow- ed, dotting with its drops the half- dried mud; that the waters again flowed over the flat, making new deposits of detri- tus, and so buried
. Elements of geology : a text-book for colleges and for the general reader. Geology. FAUNA OF THE CARBONIFEROUS AGE. 401 " We thus learn," says Dana, " that there existed in the region about Pottsville, at that time, a mud-flat on the border of a body of water; that the flat was swept by wavelets, leaving ripple-marks; that the rip- ples were still fresh when a large amphibian walked across the place; that a brief show- er of rain follow- ed, dotting with its drops the half- dried mud; that the waters again flowed over the flat, making new deposits of detri- tus, and so buried the ; This the earliest is known land-ver- tebrate. Similar tracks have also been found in the Coal- measures of Penn- sylvania, on a slab affected with sun- cracks (Fig. 578)- The reptile had evidently walked on the cracked and half - dried mud at low tide. Tracks have also been found in the Coal-measures of Illinois, Indiana, Kansas, and Nova Scotia, and in the latter region beautiful specimens of rain-prints (Fig. 577). There can be little doubt that the reptiles making the tracks men- tioned above were Labyrinthodonts. 2. Dendrerpeton.—In the Coal-measures of Nova Scotia have been found quite a number of small reptiles, belonging to several genera. Among these one is especially interesting, on account of the conditions under which it seems to have been preserved. It is called the Den- drerpeton—tree-reptile (Fig. 579), because it was found by Dawson and Lyell in sand-stone, filling the hollow stump of a Sigillaria (Fig. 580), 26. Fig. 578. -S'ab of Sandstone with Keptilian Footprints, from Coal-meas- ures of Pennsylvania; x \.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
