. Osteology of Haplocanthosaurus : with description of a new species, and remarks on the probable habits of the Sauropoda and the age and origin of the Atlantosaurus beds. bersof their bones in these deposits would indicate. An hypothesis, which it appears torae is far more reasonable and more nearly in accordance with the facts as we nowknow them, is to consider this region as presenting in late Jurassic and early Creta- 62 MEMOIRS OF THE CARNEGIE MUSEUM ceous times the appearance of a low and comparatively level plain, with numerous,lakes, both large and small, connected by an interlacing sy
. Osteology of Haplocanthosaurus : with description of a new species, and remarks on the probable habits of the Sauropoda and the age and origin of the Atlantosaurus beds. bersof their bones in these deposits would indicate. An hypothesis, which it appears torae is far more reasonable and more nearly in accordance with the facts as we nowknow them, is to consider this region as presenting in late Jurassic and early Creta- 62 MEMOIRS OF THE CARNEGIE MUSEUM ceous times the appearance of a low and comparatively level plain, with numerous,lakes, both large and small, connected by an interlacing system of river whole, when covered over with luxuriant forests and broad savannas, madepossible by the supposedly tropical climate of those times, would form an idealhabitat not alone for the large Dinosauria, but for the smaller reptiles and diminu-tive mammals of those days and for the fishes, mollusca and other aquatic life as Figs. 23 and 24 respectively, are reproductions of photographs of a footprintfrom the dinosaur beds near Canyon (ity, Colorado, and ripple marks from thesame deposits along the base of the Big Horn Mountains in Fig. 24. Photograph of ripple marks on surface of siuuistoDe, Big Horn Mountains, Wyoming. In Fig. 25 there is given the reproduction of a photograph by Dr. E. H. Barbourof the locality near Canyon City, Colorado, where were located the quarries so longworked by Professors Marsh and Cope. The dark area in the middle foregroundjust back of the tent is the quarry so long and successful!} worked by ProfessorMarsh and recently worked with equal success by Mr. Utterbacic for the CarnegieMuseum. At A directly across the cafion and on about the same horizon waslocated another quarry also worked with some success by ]\Iarsh. At B a littleab )ve and on the same side of the small canon, but in a slightly different horizon, HATCHER : OSTEOLOGY OF HAPLOCANTHOSAURUS H3 in a layer of arenaceous shales there occurs a bed
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