 Mackintosh as proof that a period of not more than 6000 years has elapsed since the boulders were left in their positions. The vertical extent of this denudation, averaging about six inches, is nearly the same with that observed in the southwest part...  The American Naturalist - Página 9881894Vista completa - Acerca de este libro
 | 1894 - 900 páginas
...Mackintosh as proof that a period of not more than six thousand years has elapsed since the bowlders were left in their positions. The vertical extent...exceeding one foot above the weathered surface of the inclosing limestone. From, this wide range of concurrent but independent testimonies we may accept... | |
 | 1893 - 1088 páginas
...Mr. D. Mackintosh as proof that a period of not more than 6,000 years has elapsed since the bowlders were left in their positions. The vertical extent...the weathered surface of the enclosing limestone. Another indication that the final melting of the ice-sheet npou British America was separated by only... | |
 | Henry Woodward - 1890 - 642 páginas
...period of not more than 6000 years has elapsed since the boulders were left in their present positions.7 The vertical extent of this denudation, averaging...Robert Bell, where veins of quartz marked with glacial striae stand out to various heights not exceeding one foot above the weathered surface of the enclosing... | |
 | Newton Horace Winchell - 1890 - 446 páginas
...period of not more than (3,00(1 years has elapsed since the boulders were left in their positions. M The vertical extent of this denudation, averaging...Robert Bell where veins of quartz marked with glacial striae stand out to various bights not exceeding one foot above the weathered surface of the enclosing... | |
 | Henry Woodward - 1890 - 636 páginas
...period of not more than 6000 years has elapsed since the boulders were left in their present positions.1 The vertical extent of this denudation, averaging...Robert Bell, where veins of quartz marked with glacial striae stand out to various heights not exceeding one foot above the weathered surface of the enclosing... | |
 | 1893 - 764 páginas
...which boulders lie has been regarded by Mr. D. Mackintosh as proof that a period of not more than 6,000 years has elapsed since the boulders were left in...Robert Bell, where veins of quartz marked with glacial striae stand out to various heights not exceeding one foot above the weathered surface of the enclosing... | |
 | 1893 - 1194 páginas
...Mr. D. Mackintosh as proof that a period of not more than 6,000 years has elapsed since the bowlders were left in their positions. The vertical extent...Robert Bell, where veins of quartz marked with glacial striae stand out to various heights not exceeding one foot above the weathered surface of the enclosing... | |
 | 1894 - 896 páginas
...Mackintosh as proof that a period of not more than six thousand years has elapsed since the bowlders were left in their positions. The vertical extent...Robert Bell, where veins of quartz marked with glacial stria; stand out to various heights not exceeding one foot above the weathered surface of the inclosing... | |
 | George Frederick Wright, Warren Upham - 1896 - 454 páginas
...drift boulders lie has been regarded by Mr. D. Mackintosh as proof that a period of not more than 6,000 years has elapsed since the boulders were left in...Robert Bell, where veins of quartz, marked with glacial strias, stand out to various heights not exceeding one foot above the weathered surface of the inclosing... | |
 | 1897 - 766 páginas
...with the great extension of ice-sheets upon the northern part of the North American continent. Prof. James Geikie maintains that the use of paleolithic...Robert Bell, where veins of quartz marked with glacial striastand out to various heights not exceeding one foot above the weathered surface of the enclosing... | |
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