New constraint on the division of Cambrian time

Research Article| June 01, 1994 New constraint on the division of Cambrian time Clark E. Isachsen; Clark E. Isachsen 1Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Search for other works by this author on: GSW Google Scholar Samuel A. Bowring; Samuel A. Bowring 1Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Search for other works by this author on: GSW Google Scholar Ed Landing; Ed Landing 2New York State Geological Survey, State Education Department, Albany, New York 12230 Search for other works by this author on: GSW Google Scholar Scott D. Samson Scott D. Samson 3Department of Geology, Syracuse University, Syracuse, New York 13210 Search for other works by this author on: GSW Google Scholar Geology (1994) 22 (6): 496–498. https://doi.org/10.1130/0091-7613(1994)022<0496:NCOTDO>2.3.CO;2 Article history first online: 02 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 Clark E. Isachsen, Samuel A. Bowring, Ed Landing, Scott D. Samson; New constraint on the division of Cambrian time. Geology 1994;; 22 (6): 496–498. doi: https://doi.org/10.1130/0091-7613(1994)022<0496:NCOTDO>2.3.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 A U-Pb zircon age of 530.7 ±0.9 Ma for a volcanic ash in the lower Placentian Series of the Avalonian terrane in southern New Brunswick provides a precise point for calibration of Early Cambrian biologic evolution. The ash is from the middle Rusophycus avalonensis Zone in Saint John, New Brunswick. This date is on subtrilobitic, Lower Cambrian strata that may be approximately correlative with the sub-Tommotian Manykaian Stage of Siberia and the lowest Meishucunian Stage of the South China platform. This age, when combined with published geochronologic data from the Cambrian, suggests that the Manykaian Stage may have lasted approximately 13 m.y. and that the Tommotian may have been considerably shorter. 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.