Results 31 to 40 of about 1,800 (206)

Fossilized soft tissues in Palaeozoic bryozoans

Papers in Palaeontology, Volume 9, Issue 1, January/February 2023., 2023
Abstract Thin sections of three Palaeozoic bryozoans reveal fossilized soft tissues that show the position of organic cuticle and internal structures such as the membranous sac and gut. The fossilization occurred apparently due to fast burial under anoxic conditions.
Andrej Ernst, Jeffrey Thompson
wiley   +1 more source

Redefinition of the Sandbian–lower Katian conodont biozonation of Baltoscandia [PDF]

Geological Magazine
Abstract Recent development in the Upper Ordovician conodont biostratigraphy of Baltoscandia highlights the mismatch between the traditionally used conodont zonation and ranges of the eponymous species. Practical application of the zonation is further complicated by the fact that the morphology of the long-ranging species Amorphognathus tvaerensis ...
Tõnn Paiste, Peep Männik, Svend Stouge, Leho Ainsaar, Tõnu Meidla   +4 more
openaire   +1 more source

A Baltic Perspective on the Early to Early Late Ordovician δ13C and δ18O Records and Its Paleoenvironmental Significance

Paleoceanography and Paleoclimatology, Volume 37, Issue 3, March 2022., 2022
Abstract The current study presents new bed‐by‐bed brachiopod δ13C and δ18O records from Öland, Sweden, which together with previously published data from the East Baltic region, constitutes a high‐resolution paired brachiopod and bulk rock carbon and oxygen isotope archive through the Lower to Upper Ordovician successions of Baltoscandia.
Oluwaseun Edward, Christoph Korte, Clemens V. Ullmann, Jorge Colmenar, Nicolas Thibault, Gabriella Bagnoli, Svend Stouge, Christian M. Ø. Rasmussen   +7 more
wiley   +1 more source

Palaeobiogeographical study of the Late Ordovician brachiopods of Iran based on quantitative analysis [PDF]

Journal of Stratigraphy and Sedimentology Researches
Brachiopods, as one of the most important benthic fauna in the Late Ordovician, show a great abundance and diversity in many continents.
Akbar Sohrabi
doaj   +1 more source

EVENT STRATIGRAPHY AND CORRELATION PROBLEMS OF THE ORDOVICIAN STRATA OF GORNY ALTAI AND SALAIR

Геодинамика и тектонофизика, 2021
Study of the Ordovician sedimentary sequences of Gorny Altai and Salair has revealed lithological and paleontological features correlating with global sedimentary events:(1) The Acerocare Regressive Event (an initial event in the Early Tremadocian);(2 ...
N. V. Sennikov, O. T. Obut, E. V. Lykova, A. V. Timokhin, R. A. Khabibulina, T. A. Shcherbanenko   +5 more
doaj   +1 more source

The only known cyclopygid–‘atheloptic’ trilobite fauna from North America: the upper Ordovician fauna of the Pyle Mountain Argillite and its palaeoenvironmental significance [PDF]

, 2012
The trilobite fauna of the upper Ordovician (middle Katian) Pyle Mountain Argillite comprises a mixture of abundant mesopelagic cyclopygids and other pelagic taxa and a benthic fauna dominated by trilobites lacking eyes.
Adrain, ALAN W. OWEN, Angelin, Apollonov, Barrande, Bartholomew, Bergström, Beyrich, Boucot, Bruton, Brøgger, Budil, Cocks, Cocks, Cooper, Dalman, DAVID L. BRUTON, Dean, Dean, Dean, Fortey, Fortey, Fortey, Fortey, Fortey, Fortey, Gürich, Hammann, Hammann, Hammann, Hansen, Hawle, Horný, Hörbinger, Ingham, Ingham, Ingham, Jaekel, Jell, Ji, Kaesler, Kielan, Kielan, Kobaysahi, Kolobova, Kozák, Krueger, Kutorga, Lane, Lespérance, Lespérance, Linnarsson, Lu, Lu, M'Coy, Marek, Marek, McCormick, Morris, Nicholson, Nicholson, Nielsen, Nielsen, Owen, Owen, Owen, Owen, Owen, Owen, Parkes, Pek, Pek, Prantl, Price, Přibyl, Raymond, Reed, Reed, Reed, Reed, Repina, Rong, Ross, Roy, Salter, Schrank, Shaw, Shaw, Sheehan, Shergold, Shergold, Thomas, Volborth, Warburg, Weir, Whittard, Whittard, Whittington, Whittington, Whittington, Whittington, Whittington, Whittington, Whittington, Zhou, Zhou, Zhou, Zhou, Zhou, Zhou, Zhou, Zhou, Šnajdr   +112 more
core   +1 more source

Composition and significance of the Katian (Upper Ordovician) conodont fauna of the Vaux Limestone (‘Calcaire des Vaux’) in Normandy, France [PDF]

Estonian Journal of Earth Sciences, 2014
Study of new conodont collections from the Vaux Limestone exposed at its classical locality at Saint-Hilaire-la-Gérard in the Sées syncline, the conodont fauna of which was previously described in a preliminary way by Weyant et al.
Annalisa Ferretti, Andrea Messori, Stig M. Bergström   +2 more
doaj   +1 more source

Three-dimensionally preserved siphuncle in an actinoceratid cephalopod from the late Katian of Bohemia [PDF]

Estonian Journal of Earth Sciences, 2023
The Ordovician to Carboniferous cephalopods of the order Actinoceratida (Teichert, 1933) are distinguished from all other cephalopods by their large siphuncles, which typically contain heavy, calcareous deposits enclosing a complex system of canals ...
Martina Aubrechtová, Vojtěch Turek
doaj   +1 more source

Climate change and the selective signature of the Late Ordovician mass extinction [PDF]

, 2012
Selectivity patterns provide insights into the causes of ancient extinction events. The Late Ordovician mass extinction was related to Gondwanan glaciation; however, it is still unclear whether elevated extinction rates were attributable to record ...
Finnegan, Seth, Fischer, Woodward W., Heim, Noel A., Peters, Shanan E.   +3 more
core   +3 more sources

Bryozoan‐rich stromatolites (bryostromatolites) from the Silurian of Gotland and their relation to climate‐related perturbations of the global carbon cycle

Sedimentology, Volume 69, Issue 1, Page 162-198, January 2022., 2022
ABSTRACT Bryozoan–stromatolite associations (bryostromatolites) formed conspicuous reef structures throughout the Sheinwoodian (Wenlock) to Ludfordian (Ludlow) stratigraphy on Gotland but have not been described so far. They are mainly composed of encrusting bryozoans forming a complex intergrowth with porostromate and spongiostromate microbes and are ...
Anna Lene Claussen, Axel Munnecke, Andrej Ernst, Marco Brandano   +3 more
wiley   +1 more source