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Mode of Formation of Marine Fossil Assemblages of the Pleistocene Millerton Formation of California

1962; Geological Society of America; Volume: 73; Issue: 1 Linguagem: Inglês

10.1130/0016-7606(1962)73[113

1943-2674

Ralph Gordon Johnson,

Geology and Paleoclimatology Research

Research Article| January 01, 1962 Mode of Formation of Marine Fossil Assemblages of the Pleistocene Millerton Formation of California RALPH GORDON JOHNSON RALPH GORDON JOHNSON Dept. Geophysical Sciences, The University of Chicago, Chicago, Ill Search for other works by this author on: GSW Google Scholar Author and Article Information RALPH GORDON JOHNSON Dept. Geophysical Sciences, The University of Chicago, Chicago, Ill Publisher: Geological Society of America Received: 26 Apr 1960 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1962, 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 (1962) 73 (1): 113–130. https://doi.org/10.1130/0016-7606(1962)73[113:MOFOMF]2.0.CO;2 Article history Received: 26 Apr 1960 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 RALPH GORDON JOHNSON; Mode of Formation of Marine Fossil Assemblages of the Pleistocene Millerton Formation of California. GSA Bulletin 1962;; 73 (1): 113–130. doi: https://doi.org/10.1130/0016-7606(1962)73[113:MOFOMF]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 writer studied 13 fossil assemblages from the Pleistocene Millerton Formation of Tomales Bay, California, to evaluate criteria involved in paleoecological analysis. He lists a fauna of 46 extant and 1 extinct species, including 18 not previously reported from the Millerton Formation. A modern fauna of the same species composition would be expected farther south.The writer used the modern environmental distributions of the species to infer the sources of the 13 fossil assemblages. Most of the Millerton fossil assemblages contain specimens exotic with respect to the majority of species, to the site of deposition, or both. Four assemblages are composed entirely of organisms that appear to have been transported to the site of deposition. Nine of the fossil assemblages include remains of organisms from two or more environments. Such hybrid accumulations were not derived solely from habitats adjacent to the site of deposition.The writer concludes that assemblages that were largely transported to the site of deposition can be recognized by their physical aspects without recourse to the bulk of the ecological data. The sources of foreign elements cannot be identified, however, on paleontological evidence alone. Ecological evaluation of a fossil assemblage is necessary, therefore, to reconstruct the mode of formation. The study of recurrent combinations of species in assemblages that underwent minimal disturbance should provide the basis for such an evaluation in ancient sediments. 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.