Results 41 to 50 of about 1,784 (228)

Healed injuries, ontogeny and scleritome construction in a Late Ordovician machaeridian (Annelida, Aphroditiformia)

Papers in Palaeontology, Volume 9, Issue 4, July/August 2023., 2023
Abstract Machaeridians are armoured annelids that were morphologically diverse during the Palaeozoic. The scleritome developed from fleshy protrusions at the base of each parapodium, with alternating segments giving rise to differentiated inner and outer shell plates.
Luke A. Parry, Gregory D. Edgecombe, Jana Bruthansová, Jakob Vinther   +3 more
wiley   +1 more source

Putative hydroid symbionts recorded by bioclaustrations in fossil molluscan shells: a revision and reinterpretation of the cecidogenus Rodocanalis

Papers in Palaeontology, Volume 9, Issue 2, March/April 2023., 2023
Abstract The fossil record yields a peculiar phenomenon in different kinds of molluscan shells: bioclaustrations formed around (epi)symbionts during growth of the hosts' shell margin. Four morphologies, two of them formerly considered bioerosion traces, are here united in the parataxonomy of bioclaustration structures under the revised cecidogenus ...
Max Wisshak, Simon Schneider, Radek Mikuláš, Sebastián Richiano, Fran Ramil, Mark A. Wilson, Paul Taylor   +6 more
wiley   +1 more source

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

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

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

Katian (Upper Ordovician) carbon isotope chemostratigraphy in the Neixiang area, central China:Implications for intercontinental correlation [PDF]

, 2019
The Katian (Upper Ordovician) Shiyanhe Formation at the Sigang section, Neixiang area, Henan Province, central China, has been investigated for carbon isotope (? 13 C carb ) chemostratigraphy.
Jing, Xiuchun, Tian, Yufeng, Stouge, Svend, Wang, Xunlian, Zhou, Hongrui   +4 more
core   +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

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

Katian (Upper Ordovician) delta C-13 chemostratigraphy and sequence stratigraphy in the United States and Baltoscandia: A regional comparison [PDF]

, 2010
delta C-13 values of numerous limestone samples from Katian (Upper Ordovician) successions in Oklahoma and the Upper Mississippi Valley document the presence of at least three of the four positive excursions that have been recognized in the lower-middle ...
Young, Seth, Bergstrom, Stig M., Schmitz, Birger,, Lund University.   +3 more
core   +3 more sources

Ordovician stratigraphy of the Junee–Narromine Volcanic Belt in central New South Wales, Australia: conodont studies and regional correlations [PDF]

Estonian Journal of Earth Sciences, 2023
This contribution reviews the newly revised biostratigraphy of Middle–Upper Ordovician marine shelf successions from the Junee–Narromine Volcanic Belt in central New South Wales, based on conodont studies from four areas covering the northern ...
Yong Yi Zhen, Ian G. Percival
doaj   +1 more source