Geologic significance of coiling direction in the planktonic foraminifera Pulleniatina

Research Article| May 01, 1976 Geologic significance of coiling direction in the planktonic foraminifera Pulleniatina Tsunemasa Saito Tsunemasa Saito 1CLIMAP, Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar Author and Article Information Tsunemasa Saito 1CLIMAP, Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1976) 4 (5): 305–309. https://doi.org/10.1130/0091-7613(1976)42.0.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Tsunemasa Saito; Geologic significance of coiling direction in the planktonic foraminifera Pulleniatina. Geology 1976;; 4 (5): 305–309. doi: https://doi.org/10.1130/0091-7613(1976)42.0.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 Systematic changes with time in the coiling direction of the planktonic fora-miniferal genus Pulleniatina provide useful datum levels for interregional correlation of Pliocene-Quaternary marine sediments. The pattern of coiling-direction changes was concordant throughout the world oceans from about 6 to 3.5 m.y. B.P. From about 3.5 to 2.3 m.y. B.P., this genus disappeared from the Atlantic and its adjacent seas. After the re-establishment of Pulleniatina in the greater Atlantic about 2.3 m.y. ago, the Atlantic coiling patterns were no longer correlative with the Indo-Pacific patterns. I consider the primary cause of the discordant coiling-direction patterns between the Atlantic and Indo-Pacific Oceans to be the severance of the tropical marine connection across Central America about 3.5 m.y. ago and the subsequent development of two independent faunal provinces. 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.