Freeman, Tom

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Journal of the Arkansas Academy of ScienceVolume 19 Article 161965Paleozoic Analogues of Recent CarbonatesTom FreemanUniversity of MissouriFollow this and additional works at: http://scholarworks.uark.edu/jaasPart of the Paleontology Commons, and the Sedimentology CommonsThis article is available for use under the Creative Commons license: Attribution-NoDerivatives 4.0 International (CC BY-ND 4.0). Users are able toread, download, copy, print, distribute, search, link to the full texts of these articles, or use them for any other lawful purpose, without asking priorpermission from the publisher or the author.This Article is brought to you for free and open access by ScholarWorks@UARK. It has been accepted for inclusion in Journal of the Arkansas Academyof Science by an authorized editor of ScholarWorks@UARK. For more information, please contact scholar@uark.edu, ccmiddle@uark.edu.Recommended CitationFreeman, Tom (1965) "Paleozoic Analogues of Recent Carbonates," Journal of the Arkansas Academy of Science: Vol. 19 , Article 16.Available at: http://scholarworks.uark.edu/jaas/vol19/iss1/1679Arkansas Academy of Science Proceedings, Vol. 19, 1965PALEOZOIC ANALOGUES OF RECENT CARBONATESTom FreemanUniversity of MissouriAnalogues of carbonate sediments accumulating today can bebund in Paleozoic limestones of northern Arkansas. Examples aredrawn from the Joachim Limestone (Ordovician), the Pitkin LimestoneMississippian), the Plattin Limestone (Ordovician), and the FayettevilleShale (Mississippian).Logan, et a\. (1964) proposed a classification based on the ar-rangement of the basic geometric units (hemispheroids and spheroids)Tom which common stromatolites and oncolites are built. Their type.LH-C/LLH-C, exemplified by algal mats in Western Australian salinas,occurs in the Joachim Limestone. More commonly however, Joachimstromatolites are of the SH-V/LLH-C variety, and reflect interarea scour3y tidal currents. Both types attest to an intertidal environment ofgrowth.iSS-l/LLH-Cstructures occur in the Pitkin Limestone. These onco-es are analogous to recent ones in south Florida (Ginsburg, 1960),id suggest water depths on the order of 0-8'. The particular mode,", reflects infrequent movement of the oncolites in moderately agi-ted water.Shinn and Ginsburg (1964) described the environment of Recentlolomite formation in the Bahamas and Florida Keys. The sites oformation are inches above mean high tide level and are characterized>y (1) laminated sediment, (2) mud cracks, (3) stromatolites, and (4)Durrows. "Partly dolomitized gastropod shells and pellets show thatie dolomite is a penecontemporaneous replacement of calcium car-)onate" (Shinn and Ginsburg, 1964). The Plattin Limestone of northernArkansas is replete with (1) laminated rock, and (2) mud cracks, andocally displays (3) stromatolites and (4) burrows. Dolomite in the'lattin has been discovered through X-ray, petrographic, and stainingechniques. Though not volumetrically important, except within localaeds, this dolomite is believed to reflect conditions analogous to thoseescribed from the Recent by Shinn and Ginsburg (1964).Illing (1954) described a variety of sand-size grains from theahamas which have acquired the all-inclusive term "Bahamite". Sev-ral of these grain types occur in limestone in the upper part of the:ayetteville Shale near Oxley, Arkansas. These include (1) ooids,2) pellets, (3) grapestones, and (4) encrusted lumps. All these sug-est waters supersaturated with respect to CaCO 3, and the lime "mud"f the upper Fayetteville is probably a direct precipitate from seawater. In addition to the "Bahamite", crinoids and a variety of fora-minifers occur in this limestone, and they serve as nucleii for the ooids.ne foraminifers include Endothyra sp., Apterrinella sp., Globivalvulinap., Calcitornella sp., and Paleotextularia sp.79Journal of the Arkansas Academy of Science, Vol. 19 [1965], Art. 16Published by Arkansas Academy of Science, 196580Arkansas Academy of Science ProceedingsREFERENCESrinsburg, R. N. 1960. Ancient analogues of Recent stromatolites:International Geol. Congress, Report of the 21st session, Norden,Proc. International Paleontological Union, p. 26-35.Fling, L. V. 1954. Bahaman calcareous sands: Amer. Assoc. Petrol.Geol. Bull., v. 38, p. 1-95.ran, B. W., Rezak, R., and Ginsburg, R. N. 1964. Classificationand environmental significance of algal stromatolites: Jour. Geol.,v. 72, p. 68-83.Shinn, Eugene A. and Ginsburg, R. N. 1964. Formation of Recentdolomite in Florida and the Bahamas: Bui. Amer. Assoc. Petrol.Geologists, No. 4, 48:547.80Journal of the Arkansas Academy of Science, Vol. 19 [1965], Art. 16http://scholarworks.uark.edu/jaas/vol19/iss1/16

Paleozoic Analogues of Recent Carbonates

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Journal of the Arkansas Academy of Science Volume 19 Article 16 1965 Paleozoic Analogues of Recent Carbonates Tom Freeman University of Missouri Follow this and additional works at: https://scholarworks.uark.edu/jaas  Part of the Paleontology Commons, and the Sedimentology Commons Recommended Citation Freeman, Tom (1965) "Paleozoic Analogues of Recent Carbonates," Journal of the Arkansas Academy of Science: Vol. 19 , Article 16. Available at: https://scholarworks.uark.edu/jaas/vol19/iss1/16 This article is available for use under the Creative Commons license: Attribution-NoDerivatives 4.0 International (CC BY-ND 4.0). Users are able to read, download, copy, print, distribute, search, link to the full texts of these articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author. This Article is brought to you for free and open access by ScholarWorks@UARK. It has been accepted for inclusion in Journal of the Arkansas Academy of Science by an authorized editor of ScholarWorks@UARK. For more information, please contact scholar@uark.edu. 79Arkansas Academy of Science Proceedings, Vol. 19, 1965PALEOZOIC ANALOGUES OF RECENT CARBONATESTom FreemanUniversity of MissouriAnalogues of carbonate sediments accumulating today can bebund in Paleozoic limestones of northern Arkansas. Examples aredrawn from the Joachim Limestone (Ordovician), the Pitkin LimestoneMississippian), the Plattin Limestone (Ordovician), and the FayettevilleShale (Mississippian).Logan, et a\. (1964) proposed a classification based on the ar-rangement of the basic geometric units (hemispheroids and spheroids)Tom which common stromatolites and oncolites are built. Their type.LH-C/LLH-C, exemplified by algal mats in Western Australian salinas,occurs in the Joachim Limestone. More commonly however, Joachimstromatolites are of the SH-V/LLH-C variety, and reflect interarea scour3y tidal currents. Both types attest to an intertidal environment ofgrowth.iSS-l/LLH-Cstructures occur in the Pitkin Limestone. These onco-es are analogous to recent ones in south Florida (Ginsburg, 1960),id suggest water depths on the order of 0-8'. The particular mode,", reflects infrequent movement of the oncolites in moderately agi-ted water.Shinn and Ginsburg (1964) described the environment of Recentlolomite formation in the Bahamas and Florida Keys. The sites oformation are inches above mean high tide level and are characterized>y (1) laminated sediment, (2) mud cracks, (3) stromatolites, and (4)Durrows. "Partly dolomitized gastropod shells and pellets show thatie dolomite is a penecontemporaneous replacement of calcium car-)onate" (Shinn and Ginsburg, 1964). The Plattin Limestone of northernArkansas is replete with (1) laminated rock, and (2) mud cracks, andocally displays (3) stromatolites and (4) burrows. Dolomite in the'lattin has been discovered through X-ray, petrographic, and stainingechniques. Though not volumetrically important, except within localaeds, this dolomite is believed to reflect conditions analogous to thoseescribed from the Recent by Shinn and Ginsburg (1964).Illing (1954) described a variety of sand-size grains from theahamas which have acquired the all-inclusive term "Bahamite". Sev-ral of these grain types occur in limestone in the upper part of the:ayetteville Shale near Oxley, Arkansas. These include (1) ooids,2) pellets, (3) grapestones, and (4) encrusted lumps. All these sug-est waters supersaturated with respect to CaCO 3, and the lime "mud"f the upper Fayetteville is probably a direct precipitate from seawater. In addition to the "Bahamite", crinoids and a variety of fora-minifers occur in this limestone, and they serve as nucleii for the ooids.ne foraminifers include Endothyra sp., Apterrinella sp., Globivalvulinap., Calcitornella sp., and Paleotextularia sp.79Journal of the Arkansas Academy of Science, Vol. 19 [1965], Art. 16Published by Arkansas Academy of Science, 196580Arkansas Academy of Science ProceedingsREFERENCESrinsburg, R. N. 1960. Ancient analogues of Recent stromatolites:International Geol. Congress, Report of the 21st session, Norden,Proc. International Paleontological Union, p. 26-35.Fling, L. V. 1954. Bahaman calcareous sands: Amer. Assoc. Petrol.Geol. Bull., v. 38, p. 1-95.ran, B. W., Rezak, R., and Ginsburg, R. N. 1964. Classificationand environmental significance of algal stromatolites: Jour. Geol.,v. 72, p. 68-83.Shinn, Eugene A. and Ginsburg, R. N. 1964. Formation of Recentdolomite in Florida and the Bahamas: Bui. Amer. Assoc. Petrol.Geologists, No. 4, 48:547.80Journal of the Arkansas Academy of Science, Vol. 19 [1965], Art. 16https://scholarworks.uark.edu/jaas/vol19/iss1/16

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Paleozoic Analogues of Recent Carbonates

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