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Geologic and taphonomic context of El Bosque Petrificado Piedra Chamana (Cajamarca, Peru)

2009; Geological Society of America; Volume: 121; Issue: 7-8 Linguagem: Inglês

10.1130/b26359.1

1943-2674

D.W. Woodcock, Herbert W. Meyer, Nelia Dunbar, William C. McIntosh, Isabel Prado, Guillermo Morales,

Pleistocene-Era Hominins and Archaeology

Research Article| July 01, 2009 Geologic and taphonomic context of El Bosque Petrificado Piedra Chamana (Cajamarca, Peru) Deborah Woodcock; Deborah Woodcock † 1Marsh Institute of Clark University, 950 Main Street, Worcester, Massachusetts 01610, USA †E-mail: dwoodcock@clarku.edu Search for other works by this author on: GSW Google Scholar Herbert Meyer; Herbert Meyer 2U.S. National Park Service, Florissant Fossil Beds National Monument, P.O. Box 185, Florissant, Colorado 80816, USA Search for other works by this author on: GSW Google Scholar Nelia Dunbar; Nelia Dunbar 3New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, New Mexico 87801, USA Search for other works by this author on: GSW Google Scholar William McIntosh; William McIntosh 3New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, New Mexico 87801, USA Search for other works by this author on: GSW Google Scholar Isabel Prado; Isabel Prado 4Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Av. Arenales 1256, Lima 14 Peru Search for other works by this author on: GSW Google Scholar Guillermo Morales Guillermo Morales 4Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Av. Arenales 1256, Lima 14 Peru Search for other works by this author on: GSW Google Scholar Author and Article Information Deborah Woodcock † 1Marsh Institute of Clark University, 950 Main Street, Worcester, Massachusetts 01610, USA Herbert Meyer 2U.S. National Park Service, Florissant Fossil Beds National Monument, P.O. Box 185, Florissant, Colorado 80816, USA Nelia Dunbar 3New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, New Mexico 87801, USA William McIntosh 3New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, New Mexico 87801, USA Isabel Prado 4Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Av. Arenales 1256, Lima 14 Peru Guillermo Morales 4Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Av. Arenales 1256, Lima 14 Peru †E-mail: dwoodcock@clarku.edu Publisher: Geological Society of America Received: 05 Nov 2007 Revision Received: 17 Sep 2008 Accepted: 02 Oct 2008 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2009 Geological Society of America GSA Bulletin (2009) 121 (7-8): 1172–1178. https://doi.org/10.1130/B26359.1 Article history Received: 05 Nov 2007 Revision Received: 17 Sep 2008 Accepted: 02 Oct 2008 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Deborah Woodcock, Herbert Meyer, Nelia Dunbar, William McIntosh, Isabel Prado, Guillermo Morales; Geologic and taphonomic context of El Bosque Petrificado Piedra Chamana (Cajamarca, Peru). GSA Bulletin 2009;; 121 (7-8): 1172–1178. doi: https://doi.org/10.1130/B26359.1 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 Volcanic and volcaniclastic rocks in the northern Peruvian Andes (central Cajamarca, 79°10′W, 6°35′S) contain a diverse assemblage of permineralized woods known as El Bosque Petrificado Piedra Chamana. The fossil forest and associated paleosol are preserved in ash-fall and lahar deposits of the Huambos Formation. Dating of plagioclase from the ash-fall deposit using 40Ar/39Ar methods yields a middle Eocene age of 39.35 ± 0.21 Ma. Accuracy of this age determination is supported by a more robust sanidine age of 39.52 ± 0.11 Ma from an underlying welded ignimbrite. Fossil wood and leaves associated with the ash-fall deposit include vertical trees rooted in the paleosol and buried in situ by the ash. Fossil wood is also present in high abundance and diversity in the overlying lahar. The fossils are significant as a low-latitude assemblage including a diversity of both monocots and dicots and in having fossil leaves occurring in close proximity to fossil woods. Preliminary analyses of wood and leaf characters suggest a megathermal climate with some limitations on plant growth associated with limited (seasonal) moisture availability. The assemblage represents lowland tropical forest that was probably growing near sea level and subsequently uplifted to the current elevation at the site (~2400–2600 m). You do not have access to this content, please speak to your institutional administrator if you feel you should have access.