Abstract
Research Article| January 01, 1944 Structure and petrology of Specimen Mountain, Colorado ERNEST E. WAHLSTROM ERNEST E. WAHLSTROM Search for other works by this author on: GSW Google Scholar GSA Bulletin (1944) 55 (1): 77–90. https://doi.org/10.1130/GSAB-55-77 Article history received: 13 Apr 1943 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 ERNEST E. WAHLSTROM; Structure and petrology of Specimen Mountain, Colorado. GSA Bulletin 1944;; 55 (1): 77–90. doi: https://doi.org/10.1130/GSAB-55-77 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Specimen Mountain, an eroded Cenozoic volcano in the northwestern corner of Rocky Mountain National Park, Colorado, is flanked on the south and west by an extensive series of faulted and folded lava flows and pyroclastics. Regional studies indicate that the erupted materials spread laterally for several miles in all directions from a single central conduit and buried a prevolcanic surface of considerable relief.The volcanic rocks, as shown by analyses, are quartz latite and silicic rhyolite. Quartz latite flows are chilled samples of a magma which by gravitative differentiation gave rise to silicic rhyolite occurring as flows and plug rocks. Thick beds of ash, agglomerate, and breccia attest to intermittent explosions of great magnitude.Inconclusive evidence suggests a Miocene or Pliocene age for the volcanics. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.
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