 Wialchia, and probably of Callipteris, if my tentative generic identification of the latter is correct, points to lower Permian age of the flora. * * * In any event, it appears probable that the flora, when it is better known, will be found to indicate...  The American Journal of Science - Page 3201918Affichage du livre entier - À propos de ce livre
 | 1922 - 170 pages
...the material submitted. However, the presence of GvfatHoplerit, Waldiia, and probably of CaUipterit, if my tentative generic identification of the latter...indicate a level not below the highest stage of the Pennsyl\anian." In 1916 I made a small collection of plant material from beds at the base of the Hermit... | |
 | 1902 - 286 pages
...conclusions of any kind on the material submitted. However, the presence of Giganlopteris, Wakliia, and probably of Callipteris, if my tentative generic...probable that the flora, when it is better known, will bo found to indicate a level not below the highest stage of the Pennsyhanian." In 1916 I made a small... | |
 | 1919 - 294 pages
...conclusions of any kind on the material submitted. However, the presence of Gigantopteris, Walchia, and probably of Callipteris, if my tentative generic...identification of the latter is correct, points to the Lowe.r Permian age of the flora. * * * In any event, it appears probable that the flora, when it... | |
 | Geological Survey (U.S.) - 1922 - 732 pages
...conclusions of any kind on the material submitted. However, the presence of Gigantopteris, Wialchia, and probably of Callipteris, if my tentative generic...indicate a level not below the highest stage of the Pennsylvanian." In 1916 I made a small collection of plant material from beds at the base of the Hermit... | |
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