. The coal measures Amphibia of North America. Amphibians, Fossil; Paleontology; Paleontology. STRATIGRAIMIIt \\h GEOGRAPHIC His i KIBUTION. [3 Class Amphibia Linn6, 1758 Continued. Subclass Lepospondytta Zittel, 1887. 1 >rder Microsauria I lawson, 1863. Family AmphibamidcB Cope, Amphibamus grandiceps Cope, 1865. Amphibamus thoracatus Moodie, 1911. < 'ephalerpeton ventriamaHtm Moodie, 1912. Family Molgophidw Cope, 1875. Erpetobrachium mazonensis Moodie, 1912. Subclass Stegocephala Cope, 1868. Order Temnospondylia Zittel, 1887. Suborder Embolomeri Cope, 1885. Family Cricotidw Cope, 1884.
. The coal measures Amphibia of North America. Amphibians, Fossil; Paleontology; Paleontology. STRATIGRAIMIIt \\h GEOGRAPHIC His i KIBUTION. [3 Class Amphibia Linn6, 1758 Continued. Subclass Lepospondytta Zittel, 1887. 1 >rder Microsauria I lawson, 1863. Family AmphibamidcB Cope, Amphibamus grandiceps Cope, 1865. Amphibamus thoracatus Moodie, 1911. < 'ephalerpeton ventriamaHtm Moodie, 1912. Family Molgophidw Cope, 1875. Erpetobrachium mazonensis Moodie, 1912. Subclass Stegocephala Cope, 1868. Order Temnospondylia Zittel, 1887. Suborder Embolomeri Cope, 1885. Family Cricotidw Cope, 1884. Spotidylerpeton 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 "Bartlelt place," the so-called "upper hols"; />, "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. , of Morris, Illinois, who has collected at Mazon Creek for mure than 30 years, lias never collected an amphibian. These facts interested me in making the following comparison: It" 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 Moo
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Keywords: ., bookcentury1900, bookdecade1910, booksub, booksubjectpaleontology
