Research Article| May 01, 1994 Carbon isotope signature of environmental change found in fossil ratite eggshells from a South Asian Neogene sequence Libby A. Stern; Libby A. Stern 1Department of Earth Sciences, 6105 Sherman Fairchild Science Center, Dartmouth College, Hanover, New Hampshire 03755-3571 Search for other works by this author on: GSW Google Scholar Gary D. Johnson; Gary D. Johnson 1Department of Earth Sciences, 6105 Sherman Fairchild Science Center, Dartmouth College, Hanover, New Hampshire 03755-3571 Search for other works by this author on: GSW Google Scholar C. Page Chamberlain C. Page Chamberlain 1Department of Earth Sciences, 6105 Sherman Fairchild Science Center, Dartmouth College, Hanover, New Hampshire 03755-3571 Search for other works by this author on: GSW Google Scholar Author and Article Information Libby A. Stern 1Department of Earth Sciences, 6105 Sherman Fairchild Science Center, Dartmouth College, Hanover, New Hampshire 03755-3571 Gary D. Johnson 1Department of Earth Sciences, 6105 Sherman Fairchild Science Center, Dartmouth College, Hanover, New Hampshire 03755-3571 C. Page Chamberlain 1Department of Earth Sciences, 6105 Sherman Fairchild Science Center, Dartmouth College, Hanover, New Hampshire 03755-3571 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1994) 22 (5): 419–422. https://doi.org/10.1130/0091-7613(1994)022<0419:CISOEC>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 Libby A. Stern, Gary D. Johnson, C. Page Chamberlain; Carbon isotope signature of environmental change found in fossil ratite eggshells from a South Asian Neogene sequence. Geology 1994;; 22 (5): 419–422. doi: https://doi.org/10.1130/0091-7613(1994)022<0419:CISOEC>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 >10-m.y.-long sequence of ratite (e.g., ostrich) eggshells from Siwalik Group sedimentary deposits of northern Pakistan and India shows a dramatic (∼8‰) increase in the δ13C in biomineralogic calcite by ∼4 Ma. Values of δ13C from ratite eggshell carbonate older than 7 Ma are about the same as those from carbonate from contemporaneous fossil mammal tooth enamel and paleosols. However, after 4 Ma, the ratite eggshell carbonate δ13C values are ∼5‰ less than these coexisting materials. These findings are evidence of the development of a C3-C4 vegetative mosaic probably mirroring the sedimentologic-edaphic mosaic of the aggrading alluvial plain of the Siwalik depositional system. 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.