CONTENTS 



Page. 



Note of Maj. J. W. Powell, Director of the Geological Survey — iii 



Letter of Dr. P. V. Hayden to the Secretary of the Interior v 



Letter of transmittal xi 



Introduction 1 



I. — The Flora of the Dakota Group 2 



General remarks 2 



Description and enumeration of species of the American Dakota Group formation 25 



Table of distribution of the plants of the Cretaceous Cenomanian formation 93 



The relationship of the flora of the Dakota Group 105 



II. — The Flora of the Laramie Group 109 



Table of distribution of the species of the Laramie Group 115 



Description of species added to the flora of the Laramie Group 121 



III.— The Flora of the Green River Group 127 



Geological distribution of the measures 127 



Enumeration and description of the species of fossil plants known from the Green River Group 135 



General remarks 205 



Table of distribution of the plants of the Green River and White River Groups 206 



Relationship of the local groups indicated by correlation of species 213 



IV. — The Miocene Flora 219 



Description of the Miocene species from specimens obtained in the so-called Bad Lands of Dakota. 221 



Description of Miocene species of California and Oregon 239 



Contribution to the Miocene flora of Alaska 257 



Species of plants from the Chalk Bluffs of California 265 



Table of distribution of the North American Miocene fossil plants 266 



Remarks on the species of Miocene plants 273 



Index 279 



Descriptions of plates follow page 283 



LIST OF ILLUSTRATIONS. 



Plates I-XVIII. — Fossil Plants from the Dakota Group — Cretaceous. 



Plates XIX-XX. — Fossil Plants from the Laramie Group. 



Plates XXI-XLV (A). — Fossil Plants from the Green River Group. 



Plate XLV ( B).— Fossil Plants from the Chalk Bluffs of Nevada County, California. 



Plates XLVI-XLIX— Fossil Plauts from the Bad Lands of Dakota. 



Plates L-LIX. — Fossil Plants from the Miocene of California and Oregon. 



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