. Carnegie Institution of Washington publication. STRATIGRAPHIC AND GEOGRAPHIC DISTRIBUTION. Class AMPHIBIA Linne, 1758—Continued. Subclass Lepospondylia Zittel, 1887. Order Microsauria Dawson, 1863. Family Amphibamide Cope, 1875. AinpliihtiniHs grandiccps Cope, 1865. Amphibamus thoracatits Moodie, 1911. Cephalerpeton 'centriarmatum Moodie, 1912. Family Molgophida Cope, 1875. Erpetobrachium mazonensis Moodie, 1912. Subclass Stegocephala Cope, 1868. Order Temnospondylia Zittel, 1887. Suborder Embolomcri Cope, 1885. Family Cricotidce Cope, 1884. Spondyler-peton spinatum Moodie, 1912. It will be
. Carnegie Institution of Washington publication. STRATIGRAPHIC AND GEOGRAPHIC DISTRIBUTION. Class AMPHIBIA Linne, 1758—Continued. Subclass Lepospondylia Zittel, 1887. Order Microsauria Dawson, 1863. Family Amphibamide Cope, 1875. AinpliihtiniHs grandiccps Cope, 1865. Amphibamus thoracatits Moodie, 1911. Cephalerpeton 'centriarmatum Moodie, 1912. Family Molgophida Cope, 1875. Erpetobrachium mazonensis Moodie, 1912. Subclass Stegocephala Cope, 1868. Order Temnospondylia Zittel, 1887. Suborder Embolomcri Cope, 1885. Family Cricotidce Cope, 1884. Spondyler-peton spinatum Moodie, 1912. It will be seen from the above arrangement that nearly all of the orders of Amphibia are represented in the Mazon Creek fauna. These animals are the oldest known land vertebrates of North Contour interval sofeet FIG. 3.—Portion of the "Morris sheet" of the U. S. Geological Survey, to show topography and situations of the exposures of fossil-bearing shales at Mazon River, a, the "Bartlett place," the so-called "upper beds"; b, "lower ; The writer was able, during July 1911, to spend a week studying the fossil beds (479) at Mazon Creek. The object of the visit was primarily to collect Amphibia, but although several thousand nodules were examined, not one contained an amphibian nor a fragment of one. Mr. J. C. Carr, of Morris, Illinois, who has collected at Mazon Creek for more than 30 years, has never collected an amphibian. These facts interested me in making the following comparison: If we take 100,000 nodules as a basis for computation of the rarity of the various forms, something like the following will be the approximate result of the investigation:. 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 Carnegie Institution of Washington. Washington, Carnegie Inst
Size: 1777px × 1406px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1902
