 ... the collecting of tracks a problem requiring special tools and trained personnel. Schuchert's ' description of the Supai as exposed on the Hermit Trail is as follows : The lower Supai formation [Supai of modern nomenclature] begins with a thick-bedded...  The American Journal of Science - Page 3231918Affichage du livre entier - À propos de ce livre
 | Charles Whitney Gilmore - 1918 - 528 pages
...exposed on the Hermit Trail is as follows : The lower Supai formation [Supai of modern nomenclature] begins with a thick-bedded and cross-bedded cliff-making...mammillary kind, interpreted as having been made by long continued rain. Midribs of either ferns or cycadofilices were seen and probably also indistinct... | |
 | Robert E. Snodgrass - 1928 - 678 pages
...modern nomenclature] begins with a thick-bedded and cross-bedded cliff-making sandstone of about ISO feet in thickness. Beneath it are red sandy shales...mammillary kind, interpreted as having been made by long continued rain. Midribs of either ferns or cycadofiliccs were seen and probably also indistinct... | |
 | 1928 - 726 pages
...exposed on the Hermit Trail is as follows : The lower Supai formation [Supai of modern nomenclature] begins with a thick-bedded and cross-bedded cliff-making...mammillary kind, interpreted as having been made by long continued rain. Midribs of either ferns or cycadofilices were seen and probably also indistinct... | |
 | 1928 - 692 pages
...exposed on the Hermit Trail is as follows : The lower Supai formation [Supai of modern nomenclature] begins with a thick-bedded and cross-bedded cliff-making...another horizon of thin flaggy beds with some sun-crack filling's and an abundance of rain-prints of the mammillary kind, interpreted as having been made by... | |
 | 1920 - 780 pages
...exposed on the Hermit Trail is as follows : The lower Supai formation [Supai of modern nomenclaturel begins with a thick-bedded and cross-bedded cliff-making...mammillary kind, interpreted as having been made by long continued rain. Midribs of either ferns or cycadofilices were seen and probably also indistinct... | |
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