. The origin and evolution of life, on the theory of action, reaction and interaction of energy. ch appeared simultaneously in South America,South Africa, Australia, Tasmania, and southern India. Thewidespread distribution of this flora in the southern hemispherefurnishes one of the arguments for the existence of the greatSouth Atlantic continent Goudwana, a transatlantic land bridgeof animal and plant migration, postulated by Suess and sup-ported by the palaeogeographic studies of Schuchert. InNorth America the glaciation of Permian time is believed to Fig. 6i. Skull and Vertebral Column of D
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. ch appeared simultaneously in South America,South Africa, Australia, Tasmania, and southern India. Thewidespread distribution of this flora in the southern hemispherefurnishes one of the arguments for the existence of the greatSouth Atlantic continent Goudwana, a transatlantic land bridgeof animal and plant migration, postulated by Suess and sup-ported by the palaeogeographic studies of Schuchert. InNorth America the glaciation of Permian time is believed to Fig. 6i. Skull and Vertebral Column of Diplocaidus. A typical solid-, broad-headed amphibian from thePermian of northern Texas. Specimen in theAmerican Museum of Natural History. (Com-pare Fig. 60.) EVOLUTION OF THE AMPHIBIANS i»i have been only local. The last of the great Palaeozoic seas dis-appeared from the surface of the continents, while the borderseas give evidence of the rise of the ammonite the close of Permian time the continent was com-pletely drained. Along the eastern seaboard the Appalachian ^^^:^. PALEOGEOGRAPHY. EARLIEST PERMIAN (LOWER ARTCNSKIAN-ROTLIEGENDE-AUTUNIAN). A GLACIAL TIMEAFTER SCMUCHERT, APRIL, 1916 E FIELDS t Fig. 62. Theoretic World En\tronment in Earliest Permian period of marked glacial conditions in the Antarctic region. Vanishing of the coalfloras and rise of the cycad-conifer floras, along with the rise of more modern insects andthe beginning of the dominance of reptiles. Modified after Schuchert, 1916. revolution occurred, and the mountains rose to heights esti-mated at from three to five miles. An opposite extreme, of slender body structure, is foundin the active predaceous types of water-loving amphibians suchas Cricotus, of rapid movements, propelled by a long tail fin,and with sharp teeth adapted to seizing an actively movingprey. This type retrogresses into the eel-like, bottom-lovingLysorophus with its slender skull, elongate body propelled by l82 T
Size: 2011px × 1243px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkcscribnerss
