Punctuations in the Pennsylvanian evolutionary history of Glabrocingulum (Mollusca: Archaeogastropoda)

Research Article| May 01, 1982 Punctuations in the Pennsylvanian evolutionary history of Glabrocingulum (Mollusca: Archaeogastropoda) DAVID E. SCHINDEL DAVID E. SCHINDEL 1Peabody Museum of Natural History, and Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06520 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1982) 93 (5): 400–408. https://doi.org/10.1130/0016-7606(1982)93<400:PITPEH>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation DAVID E. SCHINDEL; Punctuations in the Pennsylvanian evolutionary history of Glabrocingulum (Mollusca: Archaeogastropoda). GSA Bulletin 1982;; 93 (5): 400–408. doi: https://doi.org/10.1130/0016-7606(1982)93<400:PITPEH>2.0.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 The Pennsylvanian System of north-central Texas records oscillating positions of deltas prograding out over muddy marine shelves, adjacent to more distal clear-water marine areas. Invertebrate faunas in the muddy marine habitat migrated in response to these oscillations. The shell of Glabrocingulum, a common gastropod in mud-bottom faunas, shows no morphological response within a cycle to the change in physical conditions during the approach of a prograding delta over the period of tens of thousands of years. An evolutionary split in the genus is seen at the base of Missourian strata; both species continue together through the Upper Pennsylvanian in this area. This split can only be seen among different cycles of sedimentation, which are separated from each other in time by hundreds of thousands of years represented in the stratigraphic record only by unconformities. The longer-term among-cycle history may not be the result of gradually accumulating change in large parent populations. Divergences may be associated with the abrupt habitat changes that punctuate the fossil record. 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.