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• W2077254493 abstract "Research Article| February 01, 1972 Stratigraphy of the Carbonate, Black Shale, and Phosphate of the Pucará Group (Upper Triassic—Lower Jurassic), Central Andes, Peru THOMAS S SZEKELY; THOMAS S SZEKELY 801 Grant Street, Denver, Colorado 80203 Search for other works by this author on: GSW Google Scholar L. TROWBRIDGE GROSE L. TROWBRIDGE GROSE Department of Geology, Colorado School of Mines, Golden, Colorado 80401 Search for other works by this author on: GSW Google Scholar Author and Article Information THOMAS S SZEKELY 801 Grant Street, Denver, Colorado 80203 L. TROWBRIDGE GROSE Department of Geology, Colorado School of Mines, Golden, Colorado 80401 Publisher: Geological Society of America Received: 21 May 1971 Revision Received: 18 Aug 1971 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1972, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1972) 83 (2): 407–428. https://doi.org/10.1130/0016-7606(1972)83[407:SOTCBS]2.0.CO;2 Article history Received: 21 May 1971 Revision Received: 18 Aug 1971 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation THOMAS S SZEKELY, L. TROWBRIDGE GROSE; Stratigraphy of the Carbonate, Black Shale, and Phosphate of the Pucará Group (Upper Triassic—Lower Jurassic), Central Andes, Peru. GSA Bulletin 1972;; 83 (2): 407–428. doi: https://doi.org/10.1130/0016-7606(1972)83[407:SOTCBS]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 SocietyGSA Bulletin Search Advanced Search Abstract Within the Mesozoic fold-and-fault belt of west-central Peru between Lake Junín and Huancayo, the Pucará Group is subdivided into three formations. The rocks were originally described by Harrison (1944) and the formations were named from near Huancayo by Mégard (1968). They are: (1) Condorsinga Formation (top): limestones, shaly, sandy, bioclastic, and cherty; thickness is as much as 2900 m; (2) Aramachay Formation: bituminous shales and sandstones, cherts, and phosphatic rocks; thickness is as much as 600 m; (3) Chambara Formation: limestones, shaly, bituminous, and cherty; thickness is up to 1500 m.Although relatively lacking in fossils diagnostic of age, the Chambara Formation is assigned a late Triassic age (Norian-Rhaetian); it is probably correlative with most of the Pucará Group of Cerro de Pasco area (Jenks, 1951; Haas, 1953). The other two formations are Early Jurassic in age (Aramachay: Hettangian in part to middle Sinemurian; Condorsinga: upper Sinemurian to upper Toarcian).The Pucará Group represents a miogeosynclinal sequence, unconformably underlain by red clastic and volcanic rocks of the Permian Mitu Group, and disconformably overlain by clastic rocks of the Lower Cretaceous Goyllarisquisga Group or by red beds of the Middle Jurassic Cercapuquio Formation.The Chambara Formation indicates a regionally uniform and relatively deep environment of deposition. The Aramachay represents predominantly an accumulation of fine clastics and much organic material in a deep marine basin, which was followed by, and was probably preceded by, deposition of diverse sedimentary facies revealing shifting and laterally variable marine environments. The limestone beds of the Condorsinga Formation show relatively uniform and shallower marine sea-floor conditions. Rates of deposition for the three formations individually, and for the group as a whole, in cm/1,000 yrs are: Chambara: 15; Aramachay: 5.7; Condorsinga: 12.5; Pucará Group, cumulative rate: 9.7. 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." @default.
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• W2077254493 title "Stratigraphy of the Carbonate, Black Shale, and Phosphate of the Pucará Group (Upper Triassic—Lower Jurassic), Central Andes, Peru" @default.
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