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6. Miscellaneous rocks from Minnesota

South Dakota

Wyoming...

Yellowstone National Park and the Absaroka Range..

1. Electric Peak...

2. Sepulchre Mountain

3. Absaroka Range

First. Crandall Basin..

Second. Sunlight intrusives.

Third. Ishawooa intrusives

Fourth. Dikes in breccia....

4. Absarokite-shoshonite-banakite series

5. Miscellaneous rocks.

Montana

1. Madison and Gallatin valleys.

2. Butte and Boulder districts.

3. Crazy Mountains

4. Little Belt Mountains.

5. Castle Mountain district..

6. Highwood Mountains.

7. Little Rocky Mountains.

8. Bearpaw Mountains...

Idaho

Colorado

1. Denver Basin..

2. Pikes Peak district..

3. Silver Cliff and Rosita..

4. Buffalo Peaks

5. Leadville region.

6. Tenmile district

7. Elk Mountains

8. West Elk Mountains.

9. San Juan region

10. Miscellaneous rocks.

Utah

1. Rocks from the Tintic district

2. Rocks from the Henry Mountains

3. Miscellaneous rocks.

New Mexico ...

1. Basalts from the Rio Grande ('anyon.

2. Mount Taylor region..

3. Colfax County.

4. Miscellaneous rocks..

Arizona...

Nevada

1. Rocks from Washoe.

2. Rocks from Eureka.

California...

1. Mount Shasta

73

76

81

S4

85

87

87

90

92

92

95

96

97

99

104

111

111

116

120

124

129

131

134

135

137

1-10

110

141

147

153

154

157

159

160

161

1 164

166

166

167

168

169

169

170

171

172

173

174

174

175

176

176

Page.

Analyses—Continued.
Carbonate rocks—Continued.

Georgia.
Florida

1. Coral and shell rocks

2. Miscellaneous rocks..
Tennessee, Alabama, Louisiana
Texas
Ohio
Indiana.
Missouri
Kansas
Michigan, Wisconsin, Minnesota, Canada
The Yellowstone National Park
Montana....
Colorado

1. Denver Basin..
2. Leadville district
3. Fairplay, Park County.
4. Pitkin County....
5. Glenwood Springs

6. Tenmile district.
Utah
Nevada and California.

Hawaiian Islands.
Slates and shales

Vermont
New York..
Kentucky, Georgia, Alabama.
Ohio
Michigan
Wisconsin
Colorado

California...
Clays, soils, etc.

Massachusetts..
New York, Pennsylvania, Delaware.
Maryland....
Virginia, North Carolina..
South Carolina, Georgia
Florida...
Alabama, Mississippi
Illinois, Iowa, Minnesota
Wisconsin
Missouri, Arkansas
Colorado
Wyoming, Utah, New Mexico.
Nevada...

California, Washington, Hawaiian Islands
Index to rocks

255 255 255 257 258 259 259 262 263 263 264 268 269 270 270 271 272 272 273 274 275 276 277 278 278 281 283 284 284 285 286 287 289 289 290 291 292 293 293 295 296 297 298 299 302 303 301 305

LETTER OF TRANSMITTAL.'

DEPARTMENT OF THE INTERIOR,
UNITED STATES GEOLOGICAL SURVEY,

Washington, D. C., February 27, 1900. Sir: I submit herewith the manuscript for a revised and enlarged edition of Bulletin No. 148, entitled Analyses of Rocks, etc. Dr. Hillebrand's portion of the former bulletin is so much extended, and represents so distinct a demand, that it will be presented by him as a separate bulletin. Very respectfully,

F. W. CLARKE,

Chief Chemist. Hon. CHARLES D. WALCOTT,

Director United States Geological Survey.

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