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Geological Survey DEPARTMENT OF THE INTERIOR BULLETIN OF THE UNITED STATES GEOLOGICAL SURVEY No. 106 WASHINGTON GOVERNMENT PRINTING OFFICE 1 898 metadc9578 4 2 UNITED STATES GEOLOGICAL L SURVEY J. W. POWELL, DIRECTOR T HE COLORADO FORMATION A ND ITS INVERTEBRATE FAUNA BY TIMOTHY W. STANTON WASHINGTON GOVERNMENT PRINTING OFFICE 1893 CONTENTS. Page. Letter of transmittal............................................. ...... 9 Preface.............................................. .............. 11 Introduction................................................................ 13 History and definition of the Colorado formation........................ 13 Geologic description... .............................................. 20 The eastern border.......................................-................ 20 The Upper Missouri region............ ...... .................. 23 Colorado and New Mexico.............................................. 25 Utah................................. ...................... ... .34 The relations of the Colorado fauna to other Cretaceous faunas.............. 47 Description of species .................. ............................... 52 Echinodermata....... _............................................ 52 Vermes............................................................. 53 Mollusca ................................. .............................. 54 Pelecypoda........................................................ 54 Gastropoda......................................................... 127 Cephalopoda........................................................ 163 Arthropoda................................................... 189 Crustacea......................................................... 189 Plates................................191 Index.. ............................................................ 283 5 I L LU ST R A T I 0 N S. Page. PLATE I. Serpulidae and Ostreida.......................................... 194 II. Ostreidae........................................................196 III. Ostreidt ........................................................ 198 IV. Ostreidan....................................................... 200 V. Ostreidae ..................................................... 202 VI. Ostreida ....................................................... 204 VII. Ostreidae........................................................ 206 VIII. Ostreidae and Anomiidt ...................................... 208 IX. Spondylidae, Limidae, Pectinidae, Aviculdao ...................... 210 X. Aviculida.................................................. 212 XI. Aviculidae....................................................... 214 XII. Aviculidae ....... .... .... ............. ......... ...... .......... 216 XIII. Aviculidae.......................-.... ..................... 218 XIV. Aviculid.............. .................................... 220 XV. Aviculide.................................................... 222 XVI. Aviculid.a .......... .............. ............................ 224 XVII. Aviculida....... ........................................... 226 XVIII. Aviculidae..... ...... .......... .............................. 228 XIX. Mytilidae, Pinnidae, Arcidn....................................230 XX. Pinnidae, Arcida................................................. 232 XXI. Arcidte, Nuculidae, Solemyidae, Crassatellidae..................... 234 XXII. Unionidae, Lucinide, Cardiida3, Cyrenida.........................236 XXIII. Cyrenide, Cyprinida ......................................... 238 XXIV. Venerid................... ............................. 240 XXV. Donacidae, Tellinidae, Solenida ................................... 242 XXVI. Pholadomyidae, Analinidae....................................... 244 XXVII. Mactrido, Myida, Pholadida........ ........................... 246 XXVIII. Neritidie. Turritellida..... .................................. 248 XXIX. Turritellidae, Xenophorid'e, Naticid -...-................-.......... 250 XXX. Naticido, Pyramidellide, Rissoidm............................... 252 XXXI. Aporrhaido, Strombida3, Tritonidve, Fusida....................... 254 XXXII. Fusidae.......................................................... 256 XXXIII. Cancellariide,Volutidae.......................................... 258 XXXIV. Volutidae, Pleurotomidie, Actaeonidae, Bullidoe..................... 260 XXXV. Nautiloidea, Ammonoidea.....................................262 XXXVI. Ammonoidea..................................................... 264 XXXVII. Ammonoidea..................................................... 266 XXXVIII. Ammonoidea..................................................... 268 XXXIX. Ammonoidea..................................................... 270 XL. Ammonoidea..................................................... 272 XLI. Ammonoidea..................................................... 274 XLII. Ammonoidea..................................................... 276 XLIII. Ammonoidea..................................................... 278 XLIV. Ammonoidea.................................................... 280 XLV. Ammonoidea............................................... 282 7 LIETER oi: TR1' ANSMIITTAL. DEPARTMENT OF THE INTERIOR, UNITED STATES GEOLOGICAL SURVEY, DIVISION OF MESOZOIC INVERTEBRATES, Washington, D. C., July 30, 1892. SIR: I have the honor to transmit herewith a memoir by Mr. T. W. Stanton on the Colorado Formation and its Invertebrate Fauna, pre- pared for publication as a bulletin. The work was begun by him at lily suggestion, and I have, as chief of the division with which he is connected, been constantly cognizant of its progress. Very respectfully, C. A. WHITE, Geologist in Charge. Hon. J. W. POWELL, Director of the U. S. Geological Survey. 9J PREFACE. The following review of one of the Upper Cretaceous faunas as developed in the interior region of the United States has grown out of the study of a collection of fossils found by me in Huerfano park and adjacent localities in southern Colorado. This collection, the greater part of which was obtained during the summer of 1890, proved to be especially interesting because it afforded data for the closer cor- relation of certain Cretaceous strata in Utah with those east of the mountains, besides adding a considerable number of new species to the fauna of the Colorado formation. Dr. C. A. White, under whose direc- tion the field work was done, generously assigned these fossils to me for study with a view to publishing the results, and I am greatly in- debted to his sympathetic aid in every phase of the work. The stratigraphic position of the Huerfano park fossils had been fully established in the field to be beneath the Niobrara division of the Colorado formation. In making the preliminary comparisons of spe- cies it soon became evident that the fauna of this horizon vas much richer than had been supposed. Only about twenty-five or thirty species of invertebrates had been definitely assigned to the strata that are now included in the Colorado formation. Many had been described simply as Cretaceous without assignment to more definite horizons and a considerable number of other species had been erro- neously referred to the overlying Montana formation. It therefore became necessary to study as far as practicable the vertical range and the faunal associates of these doubtful species, especially those re- ported from Utah and New Mexico, making use of the collections of the U. S. National Museum and of the Geological Survey, as well as the published reports and my own observations in the field. This investi- gation added a large number of species to the fauna of the Colorado formation and showed the desirability of bringing together in one pub- lication the scattered descriptions and illustrations of all the species that can now be assigned to the fauna. While making this compila- tion the nomenclature and descriptions of the species have been re- vised in all cases in which better collections or other additional facts seemed to make it necessary. Thirty-nine species are described that are believed to he new to science. The purely paleontologic portion of the work is supplemented by a 11 12 PREFACE. geologic introduction in which the Colorado formation is defined, many local sections are described, and faunal lists are given that show the vertical range and areal distribution of the most of the species. Inci- dentally, some new evidence concerning the position of the Bear River formation is given, and large areas of Cretaceous strata in Utah are correlated with the formations east of the Rocky mountains more accu- rately than has heretofore been possible. In addition to the aid received from Dr. C. A. White and the free use of the collections under his curatorship in the U. S. National Museum, I am under many obligations to Dr. W. H. Dall and to Mr. Charles T. Simpson, of the National Museum, for assistance in compar- ing fossils with recent species, and for valued opinions concerning the generic relations of doubtful forms; also to Prof. Alpheus Hyatt, who has examined several of the species of Ammonitinu at my request, and has given me the benefit of his authoritative opinion as to their rela- tionships. T. W. S. THE COLORADO FORMATION AND ITS INVERTE- BRATE FAUNA. By T. W. STANTON. INTRODUCTION. HISTORY AND DEFINITION OF THE COLORADO FORMATION. For many years the well-known upper Missouri section has served as the basis for all studies in the Cretaceous formations of the great in- terior region of the United States. As first
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