Ostracodes of the Middle Devonian Onondaga beds of central Pennsylvania

Abstract

Research Article| March 01, 1941 Ostracodes of the Middle Devonian Onondaga beds of central Pennsylvania FRANK M. SWARTZ; FRANK M. SWARTZ Search for other works by this author on: GSW Google Scholar FREDERICK M. SWAIN FREDERICK M. SWAIN Search for other works by this author on: GSW Google Scholar GSA Bulletin (1941) 52 (3): 381–457. https://doi.org/10.1130/GSAB-52-381 Article history received: 30 Jul 1940 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation FRANK M. SWARTZ, FREDERICK M. SWAIN; Ostracodes of the Middle Devonian Onondaga beds of central Pennsylvania. GSA Bulletin 1941;; 52 (3): 381–457. doi: https://doi.org/10.1130/GSAB-52-381 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 Collections from the Middle Devonian Onondaga shale and limestone of central Pennsylvania and northeastern West Virginia have provided an abundance of Ostracoda, and the field work has also yielded much information concerning the lithologic features and the relationships of the Onondaga deposits. Descriptions are given of the Onondaga beds observed at 12 localities in Pennsylvania and 2 in West Virginia, and the stratigraphy as seen at these places is discussed.A total of 40 ostracode species has been recognized in the area. Of these, 3 were previously described, 35 are new. and 2 are represented by material too poor for specific description. The species are distributed through 11 families and 22 genera, 3 of the latter being new. For comparisons with members of this fauna, new figures and descriptions are given of 3 species from the Jeffersonville limestone of Kentucky, and of 1 from the Hamilton shale of Ontario.Four ostracode zones are recognized in the Onondaga beds near New Bloomfield, Pennsylvania. One of these is widespread; further work is needed to indicate the geographic distribution of the other three. The assemblage as a whole is not close to the known ostracodes of the Onondaga of New York, but further study of the latter will be needed before trustworthy conclusions can be drawn. The ostracodes of the Onondaga of Pennsylvania are clearly distinct from those of the Jeffersonville limestone of Kentucky, suggesting an appreciable difference in age. There are important affinities with ostracodes of the Camden chert of western Tennessee as recently studied by Bassler, but the latter assemblage includes numerous Oriskany elements and is clearly older. 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.