CONTENTS. 9 
Pennsylvania — Continued. Page. 
Portland-cement industry — Continued. 
Lehigh district — Continued. 
Manufacturing methods — Continued. 
Character and composition of the pure limestones 289 
Quarry practice 290 
Mill practice 290 
Character and composition of the product 291 
Future extensions 293 
Western Pennsylvania 294 
Rhode Island 294 
South Carolina 295 
South Dakota 296 
Portland-cement materials 296 
Limestones of the Black Hills district 296 
Niobrara (Cretaceous) chalk of eastern South Dakota 301 
Portland-cement industry 301 
Tennessee, by E. O. Ulrich 301 
Cambrian and lower Ordovician limestones of East Tennessee. 302 
Upper Ordovician limestones of eastern part of Great Valley. 302 
Upper Ordovician limestones of western part of Great Valley. 304 
Ordovician limestones of middle Tennessee 305 
Silurian limestones 306 
Mississippian limestones 306 
Texas, by J. A. Taff 307 
Portland-cement materials 307 
Austin chalk 308 
Goodland limestone 309 
Portland-cement industry 310 
Utah 310 
Vermont 311 
Virginia, by R. S. Bassler 312 
Portland-cement materials 312 
Shenandoah limestone 312 
Cambrian limestones 314 
Beekmanto wn limestone 314 
Trenton limestones 315 
Martinsburg shale 317 
Calcareous marls 318 
Details of localities 318 
Portland-cement industry 323 
Washington 323 
San Juan Islands 323 
Northeastern Washington 324 
West Virginia 325 
Portland-cement materials 325 
Ordovician limestones 325 
Lewiston (lower Helderberg) limestones 326 
Greenbrier limestone 327 
Coal Measures (Pennsylvanian) limestones 327 
Portland-cement industry 328 
Wisconsin S29 
Ordovician and Silurian limestones 329 
Quaternary shell marls 330 
Wyoming 331 
