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Books Bücher 1 - 8 von 8 in ... the individual bands of which vary from a fraction of an inch to several feet,...
" ... the individual bands of which vary from a fraction of an inch to several feet, the average thickness, however, being quite slight. Some of these bands are highly quartzose, resembling a micaceous quartzite; others are rich in biotite or hornblende,... "
Report - Seite 107
von William Bullock Clark, Edward Bennett Mathews - 1906
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The American Journal of Science, Bände 167-168

1904
...a fraction of an inch upward, the average thickness, however, being quite small. Some of these beds are highly quartzose resembling a micaceous quartzite,...others are rich in biotite or hornblende producing dark to black bands indistinguishable in a hand specimen from mica and hornblende schists and gneisses derived...
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Bulletin of the Geological Society of America, Band 16

1905
...of these beds are highly quartzose, resembling a micaceous quartzite; others are rich in biotiteor hornblende, producing dark schists, which in a hand...indistinguishable from metamorphosed igneous masses. Within the area of Baltimore gneiss are numerous small bodies of metamorphosed granites and more basic igneous...
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Bulletin - United States Geological Survey, Ausgabe 360

Geological Survey (U.S.) - 1909
...vary from a fraction of an inch upward, the average breadth, however, being small. Some of these beds are highly quartzose, resembling a micaceous quartzite;...igneous masses. Within the areas of Baltimore gneiss are numerous small bodies of metamorphosed granites and more basic igneous rocks which have been intruded...
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Pre-Cambrian Geology of North America

Charles Richard Van Hise, Charles Kenneth Leith - 1909 - 939 Seiten
...breadth, however, being small. Some of these beds are highly quartzose, resembling a micaceous quartzitc: others are rich in biotite or hornblende, producing...igneous masses. Within the areas of Baltimore gneiss are numerous small bodies of metamorphosed granites and more basic igneous rocks which have been intruded...
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The Explosibility of Coal Dust

George Samuel Rice, Joseph Christie Whitney Frazer, Axel Larsen, Frank Haas, Carl Scholz - 1910 - 186 Seiten
...with accessory minerals, which are so distributed as to produce well-marked, gray-banded gneisses, the individual bands of which vary from a fraction...until they are practically indistinguishable from it. Extensive quarries have been opened in the Baltimore gneiss and worked for very many years on the north...
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Bulletin - United States Geological Survey, Ausgabe 426

Geological Survey (U.S.) - 1910
...Some of these bands are highly quartzose, resembling a micaceous quartzite; others are rich in biotitc or hornblende, producing dark schists, which in a...metamorphosed igneous masses. Within the areas of Baitimore gneiss are also numerous small bodies of metamorphosed granites and more basic igneous rocks,...
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Report

William Bullock Clark, Edward Bennett Mathews - 1918
...feet, the average thickness, however, being quite slight. Some of these bands are highly quartzosc, resembling a micaceous quartzite; others are rich...indistinguishable from metamorphosed igneous masses. Sometimes separated by an appreciable unconformity and at other times separated by no apparent line,...
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Bulletin of the Geological Society of America, Band 16

1905
...a fraction of an inch upward, the average thickness, however, being quite thin. Some of these beds are highly quartzose, resembling a micaceous quartzite;...indistinguishable from metamorphosed igneous masses. Within the area of Baltimore gneiss are numerous small bodies of metamorphosed granites and more basic igneous...
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