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Research Article| November 01, 1970 Surface Patterns on Selected Mississippian Conodonts R. W PIERCE; R. W PIERCE Department of Geology, University of Florida, Gainesville, Florida 32601 Search for other works by this author on: GSW Google Scholar R. L LANGENHEIM, JR. R. L LANGENHEIM, JR. Department of Geology, University of Illinois, Urbana, Illinois 61801 Search for other works by this author on: GSW Google Scholar Author and Article Information R. W PIERCE Department of Geology, University of Florida, Gainesville, Florida 32601 R. L LANGENHEIM, JR. Department of Geology, University of Illinois, Urbana, Illinois 61801 Publisher: Geological Society of America Received: 03 Jul 1969 Revision Received: 18 Jun 1970 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1970, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1970) 81 (11): 3225–3236. https://doi.org/10.1130/0016-7606(1970)813225:SPOSMC2.0.CO;2 Article history Received: 03 Jul 1969 Revision Received: 18 Jun 1970 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation R. W PIERCE, R. L LANGENHEIM; Surface Patterns on Selected Mississippian Conodonts. GSA Bulletin 1970;; 81 (11): 3225–3236. doi: https://doi.org/10.1130/0016-7606(1970)813225:SPOSMC2.0.CO;2 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 Four distinct surface patterns occur among Mississippian and some other Late Paleozoic conodonts; smooth surfaces, raised reticulate networks, parallel columns, and lamellar scarps. The bar surfaces of bar forms and platform surfaces of specimens of Gnathodus and Pseudopolygnathus appear smooth at magnifications of as much as 1300X. In contrast, specimens of other platform genera, such as Polygnathus, Siphonodella, and Palmatolepis, bear raised reticulate network on the oral surface. Reticulation appears to be an organic property of the conodont rather than an artifact of preservation, and closely resembles patterns resulting from ameloblastic secretion of mammalian dental enamel. Denticle sides are characterized by a pattern resembling the surface of irregularly bundled fibers. Similar patterns have been observed on fish teeth, but not on scolecodonts.The aboral surface possesses an attachment scar composed of concentrically arranged scarps and slopes. Each scarp is the edge of an individual conodont lamella and appears to be the point of juncture between the lamellae of the basal material and those of the conodont. The distinction between conodont lamellae and those of the basal material appears to be one of composition, crystal size, and durability within an otherwise continuous mass. This observation fails to support Gross' (1960) concept of a cycle of secretion of conodont lamellae, their partial resorption, and the subsequent independent secretion of basal-material lamellae. 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.
Pierce et al. (Thu,) studied this question.