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Subcommission on Permian Stratigraphy International
Number 30 June 1997 A NEWSLETTER OF THE SUBCOMMISSION ON PERMIAN STRATIGRAPHY SUBCOMMISSION ON PERMIAN STRATIGRAPHY INTERNATIONAL COMMISSION ON STRATIGRAPHY INTERNATIONAL UNION OF GEOLOGICAL SCIENCES (IUGS) Table of Contents Notes from the SPS Secretary...................................................................................................................-1- Claude Spinosa Note from the SPS Chairman....................................................................................................................-2- Bruce R. Wardlaw Proposed new chronostratigraphic units for the Upper Permian ..............................................................-3- Amos Salvador Comments on Subdivisions of the Permian and a Standard World Scale ................................................-4- Neil W. Archbold and J. Mac Dickins Permian chronostratigraphic subdivisions ................................................................................................-5- Jin Yugan, Bruce R. Wardlaw, Brian F. Glenister and Galina V. Kotlyar The Permian Time-scale ...........................................................................................................................-6- J. B. Waterhouse Sequence Stratigraphy along Aidaralash Creek and the Carboniferous/Permian GSSP ..........................-8- Walter S. Snyder and Dora M. Gallegos Upper Paleozoic Fusulinacean Biostratigraphy of the Southern Urals ...................................................-11- Vladimir I. Davydov, Walter S. Snyder and Claude Spinosa Cordaitalean -
Sedimentology and Biostratigraphy of Bart Reef: a New Mud-Mound Discovered in the Northern Sverdrup Basin, West-Central Ellesmere Island
Sedimentology and Biostratigraphy of Bart Reef: A New Mud-Mound Discovered in the Northern Sverdrup Basin, West-Central Ellesmere Island Michael Wamsteeker* University of Calgary, Calgary, AB [email protected] and Benoit Beauchamp and Charles Henderson University of Calgary, Calgary, AB Summary Lower Permian (Sakmarian-Kungurian) carbonate rocks of the Sverdrup Basin, Canadian Arctic Archipelago, record the initiation of a dramatic cooling of ocean temperature and regional climate.1 Asselian-Sakmarian tropical-like climate cooled episodically to subtropical, temperate and finally polar-like conditions by the Kungurian.2 Cooling is recognized by monitoring changes in fossils, lithology and sedimentary textures within Permian shallow marine strata. While initial cooling during the Sakmarian from tropical to subtropical conditions is undoubtably geologically rapid, the rate of change is currently unknown. Measurement of this rate is currently being investigated by monitoring habitation depth of temperature sensitive tropical fossils on the Asselian-Sakmarian carbonate shelf, while timing is determined using the conodont biostratigraphic zonation developed for the Sverdrup Basin in conjunction with absolute dates on the International Time Scale.3 Fieldwork carried out in Summer 2007 included the first description of a new tract of Asselian mud mounds on the northern margin of the Sverdrup Basin. Contained within the Nansen Formation, this tract has been informally named the Simpson reef tract. This study documents the sedimentology and conodont biostratigraphy of Bart reef; a member of this tract. Spectacular outcrop exposure of reef and off-reef strata has enabled a truely thorough characterization including the correlation of reef and off-reef facies. Conodont biostratigraphic dating of correlative off-reef facies indicate a middle to late Asselian age for Bart reef. -
Carbon and Strontium Isotope Stratigraphy of the Permian from Nevada and China: Implications from an Icehouse to Greenhouse Transition
Carbon and strontium isotope stratigraphy of the Permian from Nevada and China: Implications from an icehouse to greenhouse transition Dissertation Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By Kate E. Tierney, M.S. Graduate Program in the School of Earth Sciences The Ohio State University 2010 Dissertation Committee: Matthew R. Saltzman, Advisor William I. Ausich Loren Babcock Stig M. Bergström Ola Ahlqvist Copyright by Kate Elizabeth Tierney 2010 Abstract The Permian is one of the most important intervals of earth history to help us understand the way our climate system works. It is an analog to modern climate because during this interval climate transitioned from an icehouse state (when glaciers existed extending to middle latitudes), to a greenhouse state (when there were no glaciers). This climatic amelioration occurred under conditions very similar to those that exist in modern times, including atmospheric CO2 levels and the presence of plants thriving in the terrestrial system. This analog to the modern system allows us to investigate the mechanisms that cause global warming. Scientist have learned that the distribution of carbon between the oceans, atmosphere and lithosphere plays a large role in determining climate and changes in this distribution can be studied by chemical proxies preserved in the rock record. There are two main ways to change the distribution of carbon between these reservoirs. Organic carbon can be buried or silicate minerals in the terrestrial realm can be weathered. These two mechanisms account for the long term changes in carbon concentrations in the atmosphere, particularly important to climate. -
International Chronostratigraphic Chart
INTERNATIONAL CHRONOSTRATIGRAPHIC CHART www.stratigraphy.org International Commission on Stratigraphy v 2014/02 numerical numerical numerical Eonothem numerical Series / Epoch Stage / Age Series / Epoch Stage / Age Series / Epoch Stage / Age Erathem / Era System / Period GSSP GSSP age (Ma) GSSP GSSA EonothemErathem / Eon System / Era / Period EonothemErathem / Eon System/ Era / Period age (Ma) EonothemErathem / Eon System/ Era / Period age (Ma) / Eon GSSP age (Ma) present ~ 145.0 358.9 ± 0.4 ~ 541.0 ±1.0 Holocene Ediacaran 0.0117 Tithonian Upper 152.1 ±0.9 Famennian ~ 635 0.126 Upper Kimmeridgian Neo- Cryogenian Middle 157.3 ±1.0 Upper proterozoic Pleistocene 0.781 372.2 ±1.6 850 Calabrian Oxfordian Tonian 1.80 163.5 ±1.0 Frasnian 1000 Callovian 166.1 ±1.2 Quaternary Gelasian 2.58 382.7 ±1.6 Stenian Bathonian 168.3 ±1.3 Piacenzian Middle Bajocian Givetian 1200 Pliocene 3.600 170.3 ±1.4 Middle 387.7 ±0.8 Meso- Zanclean Aalenian proterozoic Ectasian 5.333 174.1 ±1.0 Eifelian 1400 Messinian Jurassic 393.3 ±1.2 7.246 Toarcian Calymmian Tortonian 182.7 ±0.7 Emsian 1600 11.62 Pliensbachian Statherian Lower 407.6 ±2.6 Serravallian 13.82 190.8 ±1.0 Lower 1800 Miocene Pragian 410.8 ±2.8 Langhian Sinemurian Proterozoic Neogene 15.97 Orosirian 199.3 ±0.3 Lochkovian Paleo- Hettangian 2050 Burdigalian 201.3 ±0.2 419.2 ±3.2 proterozoic 20.44 Mesozoic Rhaetian Pridoli Rhyacian Aquitanian 423.0 ±2.3 23.03 ~ 208.5 Ludfordian 2300 Cenozoic Chattian Ludlow 425.6 ±0.9 Siderian 28.1 Gorstian Oligocene Upper Norian 427.4 ±0.5 2500 Rupelian Wenlock Homerian -
Paleogeographic Maps Earth History
History of the Earth Age AGE Eon Era Period Period Epoch Stage Paleogeographic Maps Earth History (Ma) Era (Ma) Holocene Neogene Quaternary* Pleistocene Calabrian/Gelasian Piacenzian 2.6 Cenozoic Pliocene Zanclean Paleogene Messinian 5.3 L Tortonian 100 Cretaceous Serravallian Miocene M Langhian E Burdigalian Jurassic Neogene Aquitanian 200 23 L Chattian Triassic Oligocene E Rupelian Permian 34 Early Neogene 300 L Priabonian Bartonian Carboniferous Cenozoic M Eocene Lutetian 400 Phanerozoic Devonian E Ypresian Silurian Paleogene L Thanetian 56 PaleozoicOrdovician Mesozoic Paleocene M Selandian 500 E Danian Cambrian 66 Maastrichtian Ediacaran 600 Campanian Late Santonian 700 Coniacian Turonian Cenomanian Late Cretaceous 100 800 Cryogenian Albian 900 Neoproterozoic Tonian Cretaceous Aptian Early 1000 Barremian Hauterivian Valanginian 1100 Stenian Berriasian 146 Tithonian Early Cretaceous 1200 Late Kimmeridgian Oxfordian 161 Callovian Mesozoic 1300 Ectasian Bathonian Middle Bajocian Aalenian 176 1400 Toarcian Jurassic Mesoproterozoic Early Pliensbachian 1500 Sinemurian Hettangian Calymmian 200 Rhaetian 1600 Proterozoic Norian Late 1700 Statherian Carnian 228 1800 Ladinian Late Triassic Triassic Middle Anisian 1900 245 Olenekian Orosirian Early Induan Changhsingian 251 2000 Lopingian Wuchiapingian 260 Capitanian Guadalupian Wordian/Roadian 2100 271 Kungurian Paleoproterozoic Rhyacian Artinskian 2200 Permian Cisuralian Sakmarian Middle Permian 2300 Asselian 299 Late Gzhelian Kasimovian 2400 Siderian Middle Moscovian Penn- sylvanian Early Bashkirian -
2009 Geologic Time Scale Cenozoic Mesozoic Paleozoic Precambrian Magnetic Magnetic Bdy
2009 GEOLOGIC TIME SCALE CENOZOIC MESOZOIC PALEOZOIC PRECAMBRIAN MAGNETIC MAGNETIC BDY. AGE POLARITY PICKS AGE POLARITY PICKS AGE PICKS AGE . N PERIOD EPOCH AGE PERIOD EPOCH AGE PERIOD EPOCH AGE EON ERA PERIOD AGES (Ma) (Ma) (Ma) (Ma) (Ma) (Ma) (Ma) HIST. HIST. ANOM. ANOM. (Ma) CHRON. CHRO HOLOCENE 65.5 1 C1 QUATER- 0.01 30 C30 542 CALABRIAN MAASTRICHTIAN NARY PLEISTOCENE 1.8 31 C31 251 2 C2 GELASIAN 70 CHANGHSINGIAN EDIACARAN 2.6 70.6 254 2A PIACENZIAN 32 C32 L 630 C2A 3.6 WUCHIAPINGIAN PLIOCENE 260 260 3 ZANCLEAN 33 CAMPANIAN CAPITANIAN 5 C3 5.3 266 750 NEOPRO- CRYOGENIAN 80 C33 M WORDIAN MESSINIAN LATE 268 TEROZOIC 3A C3A 83.5 ROADIAN 7.2 SANTONIAN 271 85.8 KUNGURIAN 850 4 276 C4 CONIACIAN 280 4A 89.3 ARTINSKIAN TONIAN C4A L TORTONIAN 90 284 TURONIAN PERMIAN 10 5 93.5 E 1000 1000 C5 SAKMARIAN 11.6 CENOMANIAN 297 99.6 ASSELIAN STENIAN SERRAVALLIAN 34 C34 299.0 5A 100 300 GZELIAN C5A 13.8 M KASIMOVIAN 304 1200 PENNSYL- 306 1250 15 5B LANGHIAN ALBIAN MOSCOVIAN MESOPRO- C5B VANIAN 312 ECTASIAN 5C 16.0 110 BASHKIRIAN TEROZOIC C5C 112 5D C5D MIOCENE 320 318 1400 5E C5E NEOGENE BURDIGALIAN SERPUKHOVIAN 326 6 C6 APTIAN 20 120 1500 CALYMMIAN E 20.4 6A C6A EARLY MISSIS- M0r 125 VISEAN 1600 6B C6B AQUITANIAN M1 340 SIPPIAN M3 BARREMIAN C6C 23.0 345 6C CRETACEOUS 130 M5 130 STATHERIAN CARBONIFEROUS TOURNAISIAN 7 C7 HAUTERIVIAN 1750 25 7A M10 C7A 136 359 8 C8 L CHATTIAN M12 VALANGINIAN 360 L 1800 140 M14 140 9 C9 M16 FAMENNIAN BERRIASIAN M18 PROTEROZOIC OROSIRIAN 10 C10 28.4 145.5 M20 2000 30 11 C11 TITHONIAN 374 PALEOPRO- 150 M22 2050 12 E RUPELIAN -
INTERNATIONAL CHRONOSTRATIGRAPHIC CHART International Commission on Stratigraphy V 2020/03
INTERNATIONAL CHRONOSTRATIGRAPHIC CHART www.stratigraphy.org International Commission on Stratigraphy v 2020/03 numerical numerical numerical numerical Series / Epoch Stage / Age Series / Epoch Stage / Age Series / Epoch Stage / Age GSSP GSSP GSSP GSSP EonothemErathem / Eon System / Era / Period age (Ma) EonothemErathem / Eon System/ Era / Period age (Ma) EonothemErathem / Eon System/ Era / Period age (Ma) Eonothem / EonErathem / Era System / Period GSSA age (Ma) present ~ 145.0 358.9 ±0.4 541.0 ±1.0 U/L Meghalayan 0.0042 Holocene M Northgrippian 0.0082 Tithonian Ediacaran L/E Greenlandian 0.0117 152.1 ±0.9 ~ 635 U/L Upper Famennian Neo- 0.129 Upper Kimmeridgian Cryogenian M Chibanian 157.3 ±1.0 Upper proterozoic ~ 720 0.774 372.2 ±1.6 Pleistocene Calabrian Oxfordian Tonian 1.80 163.5 ±1.0 Frasnian 1000 L/E Callovian Quaternary 166.1 ±1.2 Gelasian 2.58 382.7 ±1.6 Stenian Bathonian 168.3 ±1.3 Piacenzian Middle Bajocian Givetian 1200 Pliocene 3.600 170.3 ±1.4 387.7 ±0.8 Meso- Zanclean Aalenian Middle proterozoic Ectasian 5.333 174.1 ±1.0 Eifelian 1400 Messinian Jurassic 393.3 ±1.2 Calymmian 7.246 Toarcian Devonian Tortonian 182.7 ±0.7 Emsian 1600 11.63 Pliensbachian Statherian Lower 407.6 ±2.6 Serravallian 13.82 190.8 ±1.0 Lower 1800 Miocene Pragian 410.8 ±2.8 Proterozoic Neogene Sinemurian Langhian 15.97 Orosirian 199.3 ±0.3 Lochkovian Paleo- Burdigalian Hettangian proterozoic 2050 20.44 201.3 ±0.2 419.2 ±3.2 Rhyacian Aquitanian Rhaetian Pridoli 23.03 ~ 208.5 423.0 ±2.3 2300 Ludfordian 425.6 ±0.9 Siderian Mesozoic Cenozoic Chattian Ludlow -
Subcommission on Permian Stratigraphy Annual Report 2012
SUBCOMMISSION ON PERMIAN STRATIGRAPHY ANNUAL REPORT 2012 1. TITLE OF CONSTITUENT BODY and NAME OF REPORTER International Subcommission on Permian Stratigraphy (SPS) Submitted by: Shuzhong Shen, SPS Chairman (Since Aug 9, 2012) and Charles M. Henderson, former SPS Chairman (to Aug 9, 2012) State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences 39 East Beijing Road, Nanjing, Jiangsu 210008, P.R. China E-mail: [email protected]; [email protected] 2. OVERALL OBJECTIVES, AND FIT WITHIN IUGS SCIENCE POLICY Subcommission Objectives: The Subcommission’s primary objective is to define the series and stages of the Permian, by means of internationally agreed GSSP’s, and to provide the international forum for scientific discussion and interchange on all aspects of the Permian, but specifically on refined regional correlations. Fit within IUGS Science Policy: The objectives of the Subcommission involve two main aspects of IUGS policy: 1. The development of an internationally agreed chronostratigraphic scale with units defined by GSSP’s where appropriate and related to a hierarchy of units to maximize relative time resolution within the Permian System; and 2. Establishment of framework and systems to encourage international collaboration in understanding the evolution of the Earth during the Permian Period. 3a. CHIEF ACCOMPLISHMENTS AND PRODUCTS IN 2012 Progress was made on the three remaining Lower Permian (Cisuralian) stage GSSPs including base-Sakmarian, base-Artinskian, and base-Kungurian, but none has been voted yet. An SPS business meeting on the candidates of the Kungurian-base GSSP was held on the 8th of June, 2012 at Wells, Nevada, USA under the support of ICS. -
Hyland Group Windermere Supergroup
Map # Sample # Fossil category Fossil type Map Unit NTS 50k Age Identified by Reference Hyland Windermere solitary rugose corals, bryozoans, brachiopods and cronoid 1 12-TOA-012-1 macrofossil ossicles DME 106C/02 Mississippian R. Blodgett Group Supergroup 12-TOA-012-2 microfossil (conodont) Mesogondolella bisselli, Sweetognathus anceps? DME 106C/02 Late Sakmarian (Early Permian) C. Henderson 4 Lochriea commutatus, Gnathodus cf texanus, Idiognathoides 2 12-TOA-047-1 microfossil (conodont) minutus declinatus, I. sulcatus DME 106C/02 Mississippian/Pennsylvanian C. Henderson rhynchonellid, smooth spirifiroid, and ?terebratuloid CAMBRIAN Narchilla Fm {`HNA Ingta Fm 3 12-MC-062-1 macrofossil brachiopods, bivalve DMEc 106C/01 Late Devonian (Fammenian) to Mississippian R. Blodgett Algae Fm {`HA 4 12-MC-157-1 macrofossil crinoids CPc 106C/02 Mississippian R. Blodgett Risky Fm 12-MC-157-2 microfossil (conodont) Gnathodus cf delicatus or pseudosemiglaber CPc 106C/02 Mississippian (M-U Tournaisian) C. Henderson 5 12-SI-015-1 macrofossil solitary rugose coral, crinoids CPc 106C/02 probably Mississippian R. Blodgett Blueower Fm 6 12-SI-018-1 macrofossil crinoids, spiriferoid brachiopod, bryozoans CPc 106C/02 Mississippian R. Blodgett u{B 12-SI-018-2 microfossil (conodont) Bispathodus sp. CPc 106C/02 Probably Early Mississippian C. Henderson Yusezyu Fm 7 12-TOA-010-1 macrofossil brachiopods, bryozoans CPc 106C/02 Carboniferous-Permian (?Mississippian) R. Blodgett (Gordey & u{G Gametrail Fm Hindeodus sp., Neognathodus symmetricus, Declinognathodus marginodosus, D. donetzianus, 2 Anderson, 8 12-TOA-017-1 microfossil (conodont) Idiognathodus delicatus, Streptognathodus ?parvus CPc 106C/02 Lower Moscovian (mid-Pennsylvanian) C. Henderson EDIACARAN 1993) {`HY Nadaleen fm 9 12-TOA-021-2 macrofossil crinoids, bivalve, brachipod CPc 106C/01 Late Paleozoic, probably Mississippian R. -
1999 Geologic Time Scale Cenozoic Mesozoic Paleozoic Precambrian Magnetic Magnetic Polarity Polarity Age Bdy
1999 GEOLOGIC TIME SCALE CENOZOIC MESOZOIC PALEOZOIC PRECAMBRIAN MAGNETIC MAGNETIC POLARITY POLARITY AGE BDY. AGE . PICKS AGE . PICKS UNCERT. AGE PICKS . N N PERIOD EPOCH AGE PERIOD EPOCH AGE EON ERA . PERIOD EPOCH AGE . AGES M M T T O O (m.y.) O (Ma) O (Ma) (Ma) S S R R (Ma) I (Ma) I (Ma) (Ma) N N H H H H (Ma) A A C C HOLOCENE 65 .2 1 C1 QUATER- 0.01 C30 NARY PLEISTOCENE CALABRIAN 30 248 543 1.8 31 MAASTRICHTIAN TATARIAN 2 C2 70 C31 L 252 L 71.3 1 N UFIMIAN-KAZANIAN 2A PIACENZIAN 256 C2A PLIOCENE 32 C32 KUNGURIAN 3.6 A 260 260 I 3 E ZANCLEAN 33 CAMPANIAN LATE 5 C3 5.3 ARTINSKIAN 750 C33 M 3A MESSINIAN 80 LATE C3A 269 7.1 83.5 1 R E S SANTONIAN SAKMARIAN 4 85.8 1 E C4 900 CONIACIAN 280 282 4A 89.0 P L TORTONIAN U 1 C4A 90 ASSELIAN 10 5 TURONIAN 1000 C5 E 93.5 4 290 E 11.2 N O . A N S GZELIAN CENOMANIAN I N S 296 C N U E 99.0 5A 1 I SERRAVALLIAN 34 C34 A KASIMOVIAN E 300 MIDDLE C5A 100 E V 303 L O C G M Y L 14.8 MOSCOVIAN . O 5B S 1250 W 15 C R O 311 C5B ALBIAN N O I LANGHIAN N 5C Z E C5C 16.4 E BASHKIRIAN 110 A E M P . 5D EARLY 112 2 320 F I C5D N 323 O T 5E N C5E BURDIGALIAN N SERPUKHOVIAN N A 327 APTIAN I 6 1500 R P 20 C6 E E O 20.5 120 M0 P 6A 121 3 I VISEAN S B M1 E E N 1600 C6A S 340 I AQUITANIAN M3 R BARREMIAN 342 R A 6B S T C6B M5 I 127 3 S I 6C C6C 23.8 A TOURNAISIAN M M 130 C HAUTERIVIAN M10 1750 O C 7 E 132 4 25 C7 O 7A M12 354 C7A N C Y 8 CHATTIAN M14 VALANGINIAN R C8 L 360 L FAMENNIAN E M16 O 137 4 9 C9 R 364 P 140 E C FRASNIAN EARLY 10 BERRIASIAN A C10 28.5 N 370 M18 N I O 144 5 2000 30 11 C11 M20 A GIVETIAN I T 12 G I TITHONIAN -
The Permian Timescale: an Introduction
Downloaded from http://sp.lyellcollection.org/ by guest on October 2, 2021 The Permian timescale: an introduction SPENCER G. LUCAS1* & SHU-ZHONG SHEN2 1New Mexico Museum of Natural History and Science, 1801 Mountain Road NW, Albuquerque, NM 87104-1375, USA 2State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, 39 East Beijing Road, Nanjing, Jiangsu 210008, China *Correspondence: [email protected] Abstract: The Permian timescale has developed over about two centuries of research to the current chronostratigraphic scale advocated by the Subcommission on Permian Stratigraphy of three series and nine stages: Cisuralian (lower Permian) – Asselian, Sakmarian, Artinskian, Kun- gurian; Guadalupian (middle Permian) – Roadian, Wordian, Capitanian; and Lopingian (upper Permian) – Wuchiapingian and Changhsingian. The boundaries of the Permian System are defined by global stratotype sections and points (GSSPs) and the numerical ages of those boundaries appear to be determined with a precision better than 1‰. Nevertheless, much work remains to be done to refine the Permian timescale. Precise numerical age control within the Permian is very uneven and a global polarity timescale for the Permian is far from established. Chronostratigraphic definitions of three of the nine Permian stages remain unfinished and various issues of marine biostratigraphy are still unresolved. In the non-marine Permian realm, much progress has been made in correlation, especially using palynomorphs, megafossil plants, conchostracans and both the footprints and bones of tetrapods (amphibians and reptiles), but many problems of correlation remain, especially the cross-correlation of non-marine and marine chronologies. The further development of a Perm- ian chronostratigraphic scale faces various problems, including those of stability and priority of nomenclature and concepts, disagreements over changing taxonomy, ammonoid v. -
Cephalopods of the Early Permian Shakh-Tau Reef
©Filodiritto Editore – Proceedings Cephalopods of the Early Permian Shakh-Tau reef LEONOVA Tatiana1, SHCHEDUKHIN Alexander2 1 Borissiak Paleontological Institute of RAS, Moscow, (RUSSIA) 2 Moscow State University, Moscow, (RUSSIA) Emails: [email protected], [email protected] DOI: 10.26352/D924F5026 Abstract This paper presents the first results of the study of the cephalopod collection from the Early Permian Shakh-Tau Reef. This Late Asselian-Early Sakmarian ammonoid assemblage contains nine species of nine genera, some of which are identified in open nomenclature. In the Early Permian (Asselian-Sakmarian and Late Artinskian) assemblages of non-ammonoid cephalopods, about 30 species of coiled nautilids, four species of straight nautiloids (Orthocerida and Pseudorthocerida), and two species of Bactritida have been identified. In addition, two species belonging to the order Oncocerida were found in the Asselian-Sakmarian assemblage. The Asselian-Sakmarian reef community of non-ammonoid cephalopods differs significantly from the Sakmarian communities known from the basinal sediments of the South Urals, both taxonomically and in prevailing morphotypes. The Late Artinskian post-reef assemblage is closer in all respects to the Artinskian South Uralian assemblages, but also has its own characteristics. Keywords: Ammonoids, bactritids, nautiloids, oncocerids, Early Permian, Urals, Shakh-Tau reef Introduction The Early Permian Shakh-Tau reef, one of the four Sterlitamak reef mounds (“shikhans”), has now been almost completely excavated by a limestone quarry and has ceased to exist. The history of the study, geological structure, and components of the bioherm facies have been the subject of a number of works, and were studied in particular detail by Korolyuk [1]. During the quarrying of the limestone, layers containing the richest invertebrate fauna, including cephalopods, were opened.