70 Ma nonmarine diatoms from northern Mexico

Abstract

Research Article| March 01, 2002 70 Ma nonmarine diatoms from northern Mexico Elizabeth Chacón-Baca; Elizabeth Chacón-Baca 1Instituto de Geología, Universidad Autónoma de México, Circuito de la Investigación Científica, México D.F. 04510, México Search for other works by this author on: GSW Google Scholar H. Beraldi-Campesi; H. Beraldi-Campesi 1Instituto de Geología, Universidad Autónoma de México, Circuito de la Investigación Científica, México D.F. 04510, México Search for other works by this author on: GSW Google Scholar S.R.S. Cevallos-Ferriz; S.R.S. Cevallos-Ferriz 1Instituto de Geología, Universidad Autónoma de México, Circuito de la Investigación Científica, México D.F. 04510, México Search for other works by this author on: GSW Google Scholar A.H. Knoll; A.H. Knoll 2Botanical Museum, Harvard University, Cambridge, Massachusetts 02138, USA Search for other works by this author on: GSW Google Scholar S. Golubic S. Golubic 3Department of Biology, Boston University, Boston, Massachusetts 02215, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Elizabeth Chacón-Baca 1Instituto de Geología, Universidad Autónoma de México, Circuito de la Investigación Científica, México D.F. 04510, México H. Beraldi-Campesi 1Instituto de Geología, Universidad Autónoma de México, Circuito de la Investigación Científica, México D.F. 04510, México S.R.S. Cevallos-Ferriz 1Instituto de Geología, Universidad Autónoma de México, Circuito de la Investigación Científica, México D.F. 04510, México A.H. Knoll 2Botanical Museum, Harvard University, Cambridge, Massachusetts 02138, USA S. Golubic 3Department of Biology, Boston University, Boston, Massachusetts 02215, USA Publisher: Geological Society of America Received: 12 Jul 2001 Revision Received: 01 Nov 2001 Accepted: 19 Nov 2001 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2002) 30 (3): 279–281. https://doi.org/10.1130/0091-7613(2002)030<0279:MNDFNM>2.0.CO;2 Article history Received: 12 Jul 2001 Revision Received: 01 Nov 2001 Accepted: 19 Nov 2001 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 Elizabeth Chacón-Baca, H. Beraldi-Campesi, S.R.S. Cevallos-Ferriz, A.H. Knoll, S. Golubic; 70 Ma nonmarine diatoms from northern Mexico. Geology 2002;; 30 (3): 279–281. doi: https://doi.org/10.1130/0091-7613(2002)030<0279:MNDFNM>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 Carbonaceous cherts of the Tarahumara Formation, exposed near Huepac, Sonora, Mexico, contain abundant diatom frustules occurring as benthic filamentous colonies. Stratigraphic and paleontological observations indicate that Tarahumara sediments accumulated in a nonmarine setting; radiometric ages on encompassing volcanic rocks delimit their depositional age to ca. 70 Ma. Tarahumara fossils therefore extend the paleontological record of nonmarine diatoms from middle Eocene to Late Cretaceous. Preserved populations include forms similar to species of the extant genera Amphora and Melosira, as well as filament-forming araphid pennates comparable to species of Fragilaria and Tabellaria. Tarahumara fossils indicate that by 70 Ma, nonmarine diatoms had achieved considerable environmental as well as taxonomic diversity. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.