Smithsonian miscellaneous collections . in 162 Millardia in 164 Saratogia in I95 Upper Cambrian locality 78a 163, 167, 192, 198, 209 locality 79 167, 199, 217 localities 79c, looa 165 locality 79d 214 locality 79e 214, 217 locality 79X 167, 193, 209 localities 80, 82, 82a, 84, 134 192 localities 838, 99a I99 locality 83a 163, 192, 209 locality 83* 163, 209 locality 98 163, 192, 209 locality 98X 167, 192, 209 locality 100 163, 167, 209 locality lOOa 192, 209 Wolsey shale, limestone in, Meagher County, Montana, Middle Cambrian locality 5^ 185 Middle Cambrian locality 4% • ^^° locality 159* ^^6 W
Smithsonian miscellaneous collections . in 162 Millardia in 164 Saratogia in I95 Upper Cambrian locality 78a 163, 167, 192, 198, 209 locality 79 167, 199, 217 localities 79c, looa 165 locality 79d 214 locality 79e 214, 217 locality 79X 167, 193, 209 localities 80, 82, 82a, 84, 134 192 localities 838, 99a I99 locality 83a 163, 192, 209 locality 83* 163, 209 locality 98 163, 192, 209 locality 98X 167, 192, 209 locality 100 163, 167, 209 locality lOOa 192, 209 Wolsey shale, limestone in, Meagher County, Montana, Middle Cambrian locality 5^ 185 Middle Cambrian locality 4% • ^^° locality 159* ^^6 Wyoming, Crcpicephalus in 203 Upper Cambrian locaHty 151b 213 locaHty isie I99 locality 340C I79 Yellowstone National Park, Wyoming, Upper Cambrian locality 151b. ... 213Upper Cambrian locality I5ie I99 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 6 NUMBER 4 CAMBRIANGEOLOGY AND PALEONTOLOGY No. 4-RELATIONS BETWEEN THE CAMBRIAN AND PRE-CAMBRIAN FORMATIONS IN THE VICINITY OF HELENA, MONTANA (With Plates 39 to 44) BY CHARLES D. WALCOTT. (Publication 2416) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION JUNE 24, 1916 ZU £or5 (gaitimove (pxeee BALTIMORE, MD., U. S. A. CAMBRIAN GEOLOGY AND PALEONTOLOGY III No. 4.—RELATIONS BETWEEN THE CAMBRIAN AND PRE-CAAIBRIAN FORMATIONS IN THE ATCINITY OF HELENA, MONTANA By CHARLES D. WALCOTT(With Plates 39 to 44) CONTENTS PAGE Introduction 260 Walcotts diagrammatic section of 1809 262 Algonkian and Cambrian sections at Helena and vicinity 265 Pre-Cambrian Algonkian formations 265 Spokane shale 265 Empire shale 265 Helena limestone 266 Marsh shale 267 Cambrian formations 267 Flathead quartzite 267 Wolsey shale 268 Meagher limestone 268 Park shale 268 Pilgrim limestone 269 Dry Creek shale 269 Yogo limestone 269 Summit of the Cambrian 269 Cambrian section to the northeast of Helena on Beaver Creek 270 Cambrian section of the Little Belt Mountains 273 Stratigraphic section of the Big Snowy Mountains 273 Rothpletz section of Mount Hele
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Keywords: ., bookcentury1800, bookdecade1860, bookidsmiths, booksubjectscience
