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Excerpt from The Montana Group of Northwestern Montana Recent field work has shown that the formations Of the Montana group in and near the Blackfeet Indian Reservation Of northwestern Montana are very different from those Of the type area of the Judith River and associated formations on Missouri and Musselshell rivers, in the central part Of the State, but similar to the formations in southern Alberta as described by Dawson. They seem to deserve special description not only because they present new evidence regarding the relations Of the Belly River formation of Canada to the Judith River formation, but also because they indicate the varying geographic conditions that prevailed during Cretaceous time in this region. Furthermore, the stratigraphy as interpreted affords an excellent example Of variation in sedimentation from the seaward to the landward side of a zone Of deposition. The Montana group, as here described, was first studied by the writer in the summer of 1911, along Cut Bank Creek and Two Medicine River on the Blackfeet Indian Reservation, in company with Mr. T. W. Stanton, who has already briefly described some Of the features Of this region 1 and to whom the writer is much indebted for paleontologic determinations which, especially those for the marine formations encountered, were of great assistance in interpreting the stratigraphy. During the'next two seasons these formations were traced northward into' the type area Of the Belly River beds, described by G. M. Dawson 2 in 1885, and eastward into an area of the Judith River formation, as definitely determined by Stanton and Hatcher 3 in 1903. The interpretation of the field relations presented is therefore based primarily on the areal tracing Of the formations, although every conclusion was substantiated by paleontologic evidence. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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