Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Том 69American Philosophical Society, 1930 |
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Сторінка 143
... beds are older than the Lance . The Judith River invertebrates are brackish - water , and fresh - water , mollusks of the Pierre fauna , and on the basis of the strati- graphic position between the Claggett and Bearpaw forma- tions ...
... beds are older than the Lance . The Judith River invertebrates are brackish - water , and fresh - water , mollusks of the Pierre fauna , and on the basis of the strati- graphic position between the Claggett and Bearpaw forma- tions ...
Сторінка 152
... beds , which are composed of light - colored , clayey , sandstones . When present these beds form a conspicuous horizon , but unfortunately they are often absent , presumably as a result of an interval of erosion . Furthermore , the ...
... beds , which are composed of light - colored , clayey , sandstones . When present these beds form a conspicuous horizon , but unfortunately they are often absent , presumably as a result of an interval of erosion . Furthermore , the ...
Сторінка 153
American Philosophical Society. Basal sandstone . The Ravenscrag beds are coal - bearing , and may be divided into lower and upper portions at the level of the lowest seam . The lower Ravenscrag beds have yielded a number of dinosaurian ...
American Philosophical Society. Basal sandstone . The Ravenscrag beds are coal - bearing , and may be divided into lower and upper portions at the level of the lowest seam . The lower Ravenscrag beds have yielded a number of dinosaurian ...
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