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Alaska amount analyses andesite anticline average basin Beaver County belt Bluff carbonate Carboniferous cassiterite cement cent clay coal beds coal field coke Company contains copper country rock County Creek dacite Demopolis deposits depth dikes distance district east extends feet thick fold formation Freeport Freeport coal Geological Survey gold granite gravels gypsum Hill horizon igneous inches intrusive iron known lignite lime limestone localities located lode Lower Kittanning material Meadow Branch miles Mineral Resources U. S. mines Mountain occur outcrop oxide Pittsburg coal places portion present probably production prospecting pyrite quarry quartz quartzite railroad region Rept rhyolite ridge River Salt sample sand sandstone schists seam Seward Peninsula shaft shale siliceous silver slate slope stream structure sulphides sulphur surface syncline Third Hill Mountain tion Tonopah Upper Freeport Valley veins vicinity workable zinc
Page 151 - Reconnaissances in the Cape Nome and Norton Bay regions, Alaska, in 1900,
Page 425 - Trenton limestones would normally outcrop as two parallel bands in each valley — between the middle of the valley and the foothills of the plateaus. Faulting has, however, been so common that only one of these bands is usually present, the other being cut out by a fault.
Page 152 - The gold and silver veins of Silver City, De Lamar, and other mining districts in Idaho. In Twentieth Ann.
Page 423 - The geology of the road-building stones of Massachusetts, with some consideration of similar materials from other parts of the United States.
Page 238 - 24. List of Marine Mollusca, comprising the Quaternary fossils and recent forms from American Localities between Cape Hatteras and Cape Roque.
Page 456 - Pa., passing near the towns of Lebanon, Harrisburg, Carlisle, and Chambersburg. In Maryland the Trenton rocks occur in Washington County, while in West Virginia and Virginia they are extensively developed. The distribution of these rocks in Virginia is discussed in the following paper.
Page 529 - Willis. 1885. 16 pp., 5 pis. (Out of stock.) B 46. Nature and origin of deposits of phosphate of lime, by RAP Penrose, jr., with introduction by NS Shaler.
Page 435 - In places the clays occur in deposits of sufficient size and of such a degree of purity as to make them of commercial value. 2, the Eutaw, which is of marine origin and composed of sands and clays more or less calcareous, but nowhere showing beds of limestone properly so called. 3, the Selma chalk, which is of marine origin, and is composed, in part at least, of the microscopic shells of Foraminifera. This formation, throughout the western part of the belt covered by it in Alabama, is about 1,000...
Page 443 - At Perdue Hill the St. Stephens rock outcrops near the base of the hills which descend to the terrace on which the town of Claiborne stands. The bluff at Claiborne Landing shows .near the summit the calcareous clays or clayey limestone which lies at the base of the St. Stephens formation, and which is generally thought to be the equivalent of the Jackson group of the Mississippi geologists. It is possible that this rock, where it occurs in sufficient...
Page 440 - THE ST. STEPHENS LIMESTONE. General description. — The St. Stephens or White limestone formation of the Alabama Tertiary, which includes the uppermost of the Eocene strata, is in general equivalent to the Vicksburg limestone of the Mississippi geologists. In Alabama it exhibits three rather •well-defined phases, which, in descending order, are (1) the Upper or Salt Mountain division, observed at one locality only in Clarke County; (2) the Middle or St. Stephens division; and (3) the Lower or...