Carbonate concretions: An ideal sedimentary host for microfossils

Abstract

Research Article| March 01, 1985 Carbonate concretions: An ideal sedimentary host for microfossils Charles D. Blome; Charles D. Blome 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Nairn R. Albert Nairn R. Albert 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Geology (1985) 13 (3): 212–215. https://doi.org/10.1130/0091-7613(1985)13<212:CCAISH>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 Charles D. Blome, Nairn R. Albert; Carbonate concretions: An ideal sedimentary host for microfossils. Geology 1985;; 13 (3): 212–215. doi: https://doi.org/10.1130/0091-7613(1985)13<212:CCAISH>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 SocietyGeology Search Advanced Search Abstract Microfossils extracted from carbonate concretions tend to be better preserved, more abundant and diverse, and more likely to retain delicate and fragile structures than those extracted from the surrounding rocks. Enhanced preservation correlates with early diagenetic concretion formation at or near the sediment-water interface and with higher carbonate, organic material, and metallic cation content than in surrounding rocks. Early diagenetic growth is inferred by diverging sedimentary laminations and small-scale sedimentary structures in fossiliferous carbonate concretions. High initial concentrations of microorganisms or fecal pellets may commonly be responsible for incipient carbonate-concretion growth. Excellent preservation is demonstrated by radiolarians and palynomorphs extracted from a carbonate concretion from the Middle Jurassic Shelikof Formation, southern Alaska. 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.