Portal de Periódicos da CAPES

MODELS AND METHODS FOR ANALYSIS OF THE MODE OF FORMATION OF FOSSIL ASSEMBLAGES

1960; Geological Society of America; Volume: 71; Issue: 7 Linguagem: Inglês

10.1130/0016-7606(1960)71[1075

1943-2674

Ralph Gordon Johnson,

Geological Studies and Exploration

Research Article| July 01, 1960 MODELS AND METHODS FOR ANALYSIS OF THE MODE OF FORMATION OF FOSSIL ASSEMBLAGES RALPH GORDON JOHNSON RALPH GORDON JOHNSON DEPARTMENT OF GEOLOGY, UNIVERSITY OF CHICAGO, CHICAGO, ILLINOIS Search for other works by this author on: GSW Google Scholar GSA Bulletin (1960) 71 (7): 1075–1086. https://doi.org/10.1130/0016-7606(1960)71[1075:MAMFAO]2.0.CO;2 Article history received: 09 Dec 1958 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; MODELS AND METHODS FOR ANALYSIS OF THE MODE OF FORMATION OF FOSSIL ASSEMBLAGES. GSA Bulletin 1960;; 71 (7): 1075–1086. doi: https://doi.org/10.1130/0016-7606(1960)71[1075:MAMFAO]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 Theoretical aspects of the formation of fossil assemblages are explored for the purpose of obtaining criteria and methods for the reconstruction of circumstances of preservation of shallow-water marine organisms. Models are developed which represent: (1) a death assemblage preserved under conditions of rapid burial; (2) an assemblage preserved in situ under conditions of gradual accumulation; and (3) an assemblage composed almost entirely of remains transported to the site of burial.The histories represented by the models influence the following features of fossil assemblages: faunal composition, morphologic composition, density, disassociation of hard parts, fragmentation, surface condition of fossils, chemical and mineralogical composition of fossils, orientation, dispersion, and the texture and structure of the sedimentary aggregate. The expressions of these features indicate that biological criteria are more indicative of the mode of accumulation than physical criteria.The stretched-line method of sampling provides a means of obtaining objective and repeatable measures of features of the fossil assemblages in place. It is restricted to sediments in which fossils can be recovered readily. A rank-correlation analysis of 11 samples from the Pleistocene Millerton formation of Tomales Bay, California, is given as an example of a means of evaluating the interrelations of variables measured by the line technique. 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.