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Ordovician-Silurian relations in Pennsylvania

1939; Geological Society of America; Volume: 50; Issue: 7 Linguagem: Inglês

10.1130/gsab-50-1165

1943-2674

Beatrice E. Willard, Arthur B. Cleaves,

Geology and Paleoclimatology Research

Research Article| July 01, 1939 Ordovician-Silurian relations in Pennsylvania BRADFORD WILLARD; BRADFORD WILLARD Search for other works by this author on: GSW Google Scholar ARTHUR B. CLEAVES ARTHUR B. CLEAVES Search for other works by this author on: GSW Google Scholar Author and Article Information BRADFORD WILLARD ARTHUR B. CLEAVES Publisher: Geological Society of America Received: 03 Jan 1939 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 1939 Geological Society of America GSA Bulletin (1939) 50 (7): 1165–1198. https://doi.org/10.1130/GSAB-50-1165 Article history Received: 03 Jan 1939 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation BRADFORD WILLARD, ARTHUR B. CLEAVES; Ordovician-Silurian relations in Pennsylvania. GSA Bulletin 1939;; 50 (7): 1165–1198. doi: https://doi.org/10.1130/GSAB-50-1165 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 New data on the Ordovician-Silurian relations in Pennsylvania make possible reinterpretation of long-known facts. These data were obtained through the reopening of abandoned railway tunnels in south-central Pennsylvania and in highway construction elsewhere. It appears now that the term Oswego was misapplied in Pennsylvania. There is probably little or no true Oswego in the State. For beds commonly referred to by that name, the term Bald Eagle is revived and treated as basal Juniata. There is a disconformity between the Bald Eagle and the Tuscarora east of the Susquehanna River and either a disconformity or unconformity below the Bald Eagle or Tuscarora or Shawangunk from the Susquehanna River into southeastern New York. Either hiatus might be used as a convenient Ordovician-Silurian line of separation. If the lower is accepted, it puts the Juniata in the Silurian; if the upper be used, then the Juniata becomes Ordovician. The magnitude of the lower hiatus and the structural data associated with it indicate that the Taconic disturbance affected Pennsylvania probably as far west as the Susquehanna Valley. 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.