The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 96
... deposits are rock salt and potash salts , coal , oil , and gas . Economically important evaporites ( salts formed by chemical precipita- tion under generally arid conditions ) of Permian age are found in the United States , especially ...
... deposits are rock salt and potash salts , coal , oil , and gas . Economically important evaporites ( salts formed by chemical precipita- tion under generally arid conditions ) of Permian age are found in the United States , especially ...
Page 289
... deposits . Mineral depos- its of phosphate are of six principal types , listed in ap- proximate order of size and world importance : ( 1 ) ma- rine phosphorites ; ( 2 ) igneous apatite deposits ; ( 3 ) re- sidual phosphorites ; ( 4 ) ...
... deposits . Mineral depos- its of phosphate are of six principal types , listed in ap- proximate order of size and world importance : ( 1 ) ma- rine phosphorites ; ( 2 ) igneous apatite deposits ; ( 3 ) re- sidual phosphorites ; ( 4 ) ...
Page 290
... deposits in southwestern Tennessee are residual deposits from the weathering of phosphatic lime- stones of the Hermitage , Bigby , and Leipers formations , all of Ordovician age . The deposits conform to the out- crop pattern of the ...
... deposits in southwestern Tennessee are residual deposits from the weathering of phosphatic lime- stones of the Hermitage , Bigby , and Leipers formations , all of Ordovician age . The deposits conform to the out- crop pattern of the ...
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