 ... (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 feet in thickness, and is...  Bulletin of the United States Geological Survey - Seite 435von Geological Survey (U.S.) - 1904Vollansicht - Über dieses Buch
 | 1904 - 924 Seiten
...susceptible of classification into four divisions. These are, in ascending order: (1) The Tuscaloosa, a formation of fresh-water origin, made up in the...less argillaceous limestone. In a general way it may be said that the lower and upper thirds of the formation contain 25 per cent or more of clayey matters... | |
 | 1903 - 534 Seiten
...Tuscaloosa, a formation of fresh-water origin, made up in the main of sands and clays in many alterations. In places the clays occur in deposits of sufficient...less argillaceous limestone. In a general way it may be said that the lower and upper thirds of the formation contain 25 per cent, and upward of clayey... | |
 | Samuel Franklin Emmons, Geological Survey (U.S.) - 1904 - 550 Seiten
...alternations. In places the clays occur in deposits of sufficient size and of such a degree of purity us to make them of commercial value. (2) The Eutaw, which...less argillaceous limestone. In a general way it may be said that the lower and upper thirds of the formation contain 25 per cent or more of clayey matters... | |
 | Edwin Clarence Eckel - 1904 - 148 Seiten
...of marine origin and composed of sands and clays more or less calcareous, but nowhere showing bed's of limestone properly so called. 3, the Selma chalk,...less argillaceous limestone. In a general way it may be said that the lower and upper thirds of the formation contain 25 per cent. and upward of clayey... | |
 | 1904 - 1040 Seiten
...calcareous sands and clajTs, but nowhere shows beds of limestone properly so called. The Selma chalk is of marine origin and is composed, in part at least,...less argillaceous limestone. In a general way it may be said that the lower and upper thirds of the formation contain 25 per cent or more of clayey matters... | |
 | 1904 - 768 Seiten
...calcareous sands and cla3's, but nowhere shows beds of limestone properly so called. The Selma chalk is of marine origin and is composed, in part at least,...less argillaceous limestone. In a general way it may be said that the lower and upper thirds of the formation contain 25 per cent or more of clayey matters... | |
 | George Ferdinand Becker - 1904 - 732 Seiten
...calcareous sands and clays, but nowhere shows beds of limestone properly so called. The Selma chalk is of marine origin and is composed, in part at least,...less argillaceous limestone. In a general way it may be said that the lower and upper thirds of the formation contain 25 per cent or more of clayey matters... | |
 | Edwin Clarence Eckel - 1913 - 458 Seiten
...calcareous sands anil clays, but nowhere shows beds of limestone properly so called. The Selma chalk is of marine origin and is composed, in part at least, of the microscopic shells of Foraminifera. The Ripley, like the Selma, is a marine formation and is generally predominantly calcareous but contains... | |
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