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- W1994878647 abstract "Research Article| June 01, 2001 Notes on geochronologic and chronostratigraphic units Stephen L. Walsh Stephen L. Walsh 1Department of Paleontology, San Diego Natural History Museum, P.O. Box 121390, San Diego, California 92112, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Stephen L. Walsh 1Department of Paleontology, San Diego Natural History Museum, P.O. Box 121390, San Diego, California 92112, USA Publisher: Geological Society of America Received: 03 Feb 1999 Revision Received: 19 Jun 2000 Accepted: 05 Jul 2000 First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2001) 113 (6): 704–713. https://doi.org/10.1130/0016-7606(2001)113<0704:NOGACU>2.0.CO;2 Article history Received: 03 Feb 1999 Revision Received: 19 Jun 2000 Accepted: 05 Jul 2000 First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Stephen L. Walsh; Notes on geochronologic and chronostratigraphic units. GSA Bulletin 2001;; 113 (6): 704–713. doi: https://doi.org/10.1130/0016-7606(2001)113<0704:NOGACU>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 There is no need to regard the term “geochronology” as a redundant synonym of either “geologic time scale” or “radiometric dating.” This term may reasonably be used in reference to all principles and methods employed in geology to determine the relative and numerical ages of all kinds of rocks. The term “chronostratigraphy” would best be restricted to the process of defining the formal subdivisions of the geologic time scale.“Geochronologic unit” is best used as a general category term. It includes aurichronologic units (spans of time defined operationally by golden spikes), geochronometric units (spans of time defined theoretically in terms of absolute numerical age before present), and biochronologic units (spans of time defined theoretically by paleobiological events). A chronostratigraphic unit is a set of material, existing, stratified rock that was formed during a given span of time (geochronologic unit). Therefore, a geochronologic unit must be defined before the corresponding chronostratigraphic unit can even be conceptualized.Chronostratigraphic units are generally not isochronous bodies of rock, because owing to the unconformities that exist over any appreciable geographic area, their upper and lower material boundaries are not everywhere synchronous. Thus, particular systems, series, and stages are material stratigraphic units of geographically variable time value within the maximum temporal limits of the corresponding periods, epochs, and ages.Geochronologic boundaries that have been formally ratified serve a conventional function, and will rarely if ever need to be redefined. We can continue to discover and debate important events in Earth history without insisting that such events must be used to constantly redefine the boundaries of our global temporal pigeonholes. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W1994878647 title "Notes on geochronologic and chronostratigraphic units" @default.
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