. Bulletin of the Geological Society of America. Geology. BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA Vol. 19, pp. 315-338 October 28, i908 GEOLOGIC EECONNAISSAi^CE OP THE PORCUPINE VALLEY, ALASKA" BY E. M. KINDLE {Presented by title before tlie Society December 31, 1907) CONTENTS I'age Topography and drainage 315 Structure 317 Folds 317 Faults 318 Stratigraphj"^ and faunas 320 Pre-Ordovician series 320 Ordovician limestone 322 Ordovician fauna 823 Silurian dolomites 324 Middle Silurian fauna 325 Graptolite fauna 325 Devonian limestone 327 Devonian fauna 327 Devonian shale aud igne
. Bulletin of the Geological Society of America. Geology. BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA Vol. 19, pp. 315-338 October 28, i908 GEOLOGIC EECONNAISSAi^CE OP THE PORCUPINE VALLEY, ALASKA" BY E. M. KINDLE {Presented by title before tlie Society December 31, 1907) CONTENTS I'age Topography and drainage 315 Structure 317 Folds 317 Faults 318 Stratigraphj"^ and faunas 320 Pre-Ordovician series 320 Ordovician limestone 322 Ordovician fauna 823 Silurian dolomites 324 Middle Silurian fauna 325 Graptolite fauna 325 Devonian limestone 327 Devonian fauna 327 Devonian shale aud igneous series 329 Carboniferous shales and limestones 330 Carboniferous faunas 332 Extent of the Carboniferous in northern Alaslia 335 Tertiary beds 336 Lavas 337 TOPOGEAPHY AND DRAINAGE Topographically the country traversed by the Porcupine river between the International boundary and the Yukon falls into two distinct prov- inces. The most easterly of these includes the low mountain and hill country extending westward irom the boundary about 100 miles. The Yukon flats comprise the westerly belt. A little more than 100 miles of the lower course of Porcupine river lie in the extensive alluvial plain known as the Yukon flats. Along this (J Manuscript received by the Secretary of the Society July 4, 1908. XXXI—Bull. Geol. Soc. Am., Vol. 10, 1"J07 (315). 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 Geological Society of America. [New York : The Society]
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