Subaerial Laminated Crusts of the Florida Keys

Research Article| February 01, 1968 Subaerial Laminated Crusts of the Florida Keys H. G MULTER; H. G MULTER College of Wooster, Wooster, Ohio Search for other works by this author on: GSW Google Scholar J. E HOFFMEISTER J. E HOFFMEISTER Institute of Marine Science, University of Miami, Florida Search for other works by this author on: GSW Google Scholar Author and Article Information H. G MULTER College of Wooster, Wooster, Ohio J. E HOFFMEISTER Institute of Marine Science, University of Miami, Florida Publisher: Geological Society of America Received: 19 Sep 1966 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1968, 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 (1968) 79 (2): 183–192. https://doi.org/10.1130/0016-7606(1968)79[183:SLCOTF]2.0.CO;2 Article history Received: 19 Sep 1966 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 H. G MULTER, J. E HOFFMEISTER; Subaerial Laminated Crusts of the Florida Keys. GSA Bulletin 1968;; 79 (2): 183–192. doi: https://doi.org/10.1130/0016-7606(1968)79[183:SLCOTF]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 Exposed Pleistocene marine limestones of the Florida Keys are often coated by laminated 1-to-6-cm-thick calcitic crusts. Heretofore these crusts have locally been identified as indurated marine algal stromatolites similar to the soft, marine, living algal stromatolitic mats of the Florida Keys, which border and occasionally even coat the encrusted bedrock; such juxtaposition is now considered merely coincidental.C14 dating of five different crust samples reveals a time of formation (within the last 4395 ± 90 years) during which the land surface was above sea level. Field relationships and laboratory evidence also indicate subaerial origin. Three general types of crusts are: (1) microcrystalline rind, (2) dense laminated, and (3) porous laminated.Similar laminated crusts found in subsurface cores suggest emergence followed by submergence of the Key Largo reef in late Pleistocene time.Proper identification of such subaerially formed laminated crusts, to distinguish them from similar-appearing crusts formed in marine environments, is necessary for correct interpretation of paleoenvironments and former sea level fluctuations. Thin crusts may be the only evidence for recognizing some ancient unconformities. 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.