. Smithsonian miscellaneous collections . (Publication 4313) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION AUGUST 8, 1958 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 119, NUMBER 3(End of Volume) CfjarleS 2i. anlr jWarp ^nux SllaltottS^ejieartf) Jf unlr MISSISSIPPIAN FAUNA IN NORTHWESTERN SONORA MEXICO (With Nine Plates) By W. H. Easton John E. Sanders J. Brookes Knight Arthur K. Miller. (Publication 4313) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION AUGUST 8, 1958 THE LORD BALTIMORE PRESS, , MD., U. S. A. FOREWORD This is the third of a series of desc
. Smithsonian miscellaneous collections . (Publication 4313) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION AUGUST 8, 1958 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 119, NUMBER 3(End of Volume) CfjarleS 2i. anlr jWarp ^nux SllaltottS^ejieartf) Jf unlr MISSISSIPPIAN FAUNA IN NORTHWESTERN SONORA MEXICO (With Nine Plates) By W. H. Easton John E. Sanders J. Brookes Knight Arthur K. Miller. (Publication 4313) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION AUGUST 8, 1958 THE LORD BALTIMORE PRESS, , MD., U. S. A. FOREWORD This is the third of a series of descriptive papers on the paleontologyof the rocks exposed in the vicinity of Caborca, Sonora, The faunasof the Cambrian and Permian sediments have already been published.^This description of the Mississippian fossils is the last extensive paperin the series. Pre-Cambrian algae and a few Devonian species are theonly other fossils collected by the expeditions of 1943 and 1944. The work in Sonora was undertaken to establish a Paleozoic se-quence in that region. Some excitement resulted from the early reportof Cambrian in an area that had hitherto been thought to containmostly Mesozoic rocks. The work of A. R. V. Arellano of the Insti-tuto Geologico de Mexico and G. A. Cooper of the Smithsonian Insti-tution resulted in the discovery of Lower Cambrian and Devonian aswell as confirmation of the presenc
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