Abstract
Research Article| January 01, 1915 Paleobotanic evidence of the age of the Morrison Formation1 EDWARD WILBER BERRY EDWARD WILBER BERRY Search for other works by this author on: GSW Google Scholar GSA Bulletin (1915) 26 (1): 335–342. https://doi.org/10.1130/GSAB-26-335 Article history received: 03 Apr 1915 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation EDWARD WILBER BERRY; Paleobotanic evidence of the age of the Morrison Formation. GSA Bulletin 1915;; 26 (1): 335–342. doi: https://doi.org/10.1130/GSAB-26-335 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract IntroductoryThe only fossil plants that have been recorded from the Morrison formation are the silicified fragments of cycad stumps which occur in such abundance in the Freezeout Hills of Carbon County and at one or two other localities in Wyoming. These were described by Ward2 and referred to the genus Cycadella. About a score of so-called species which were based on external appearance were described. Neither the genus (Cycadella) nor any of the species have ever been found outside the Morrison formation, so that they furnish no direct evidence regarding the age of the deposits. They are, however, very close to the similarly silicified trunks of Cycadeoidea in their habit and general plan of organization. The Cycadeoidea remains are common in the Lakota formation of the Black Hills rim and in the Patuxent formation of Maryland. In the absence of studies of the internal structure of the Morrison genus . . . This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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