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Books Bücher 1 - 3 von 3 in consists of a series of large and small lenses of iron-ore bearing clays which occupy...
" consists of a series of large and small lenses of iron-ore bearing clays which occupy ancient depressions in the surface of the Patuxent formation. . . . The clays are highly carbonaceous, lignitized trunks of trees being often encountered in an upright... "
Report - Seite 214
von William Bullock Clark, Edward Bennett Mathews - 1918
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The Journal of Geology

Thomas Chrowder Chamberlin - 1897
...are encountered in an upright position, with their larger roots still intact. Scattered through the dark clays are vast quantities of nodules of iron...reaching many tons in weight, and known to the miners as "white ore," "hone ore" or "steel ore." In the upper portions of the formation which have been exposed...
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Economic Geology: 1909

1909
...unconformably ancient depressions in the surface of the underlying Patuxent formation. Scattered through these clays are vast quantities of nodules of iron carbonate, at times reaching many tons in weight. In the upper portion the carbonates have weathered to limonite. These ores occur along the western...
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Geological Survey Water-supply Paper, Ausgaben 1776-1778

1964
...highly carbonaceous, lignltized trunks of trees being often encountered in an upright position with the larger roots still intact. Scattered through the tough,...miners under the name of "white ore." In the upper portions of the formation the carbonate ores have changed to hydrous oxides of iron, which the miners...
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