Results 21 to 30 of about 180 (132)
Rivista Italiana di Paleontologia e Stratigrafia, 2021 Lower Ordovician brachiopod macrofaunas in Belgium (Avalonia) are seldom collected and studied due to the poor preservation of material. Here we describe a new fauna of linguliformean brachiopods from the Chevlipont Formation (lower Tremadocian) in the ...
YVES CANDELA +5 more
doaj +1 more source
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 +7 more
wiley +1 more source
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 +3 more
wiley +1 more source
Trilobites and biofacies in the Early–Middle Ordovician of Baltica and a brief comparison with the Yangtze Plate [PDF]
Estonian Journal of Earth Sciences, 2013 Baltica except for Baltoscandia was subject to an early Tremadocian immigration of trilobites similar to that on other plates. In Baltoscandia the Olenid biofacies lingered on until it was replaced by the late Tremadocian Ceratopyge biofacies.
Jan Bergström † +2 more
doaj +1 more source
Advances in the Lower Ordovician of the western Iberian Chain, NE Spain [PDF]
Estonian Journal of Earth Sciences, 2023 The western Iberian Chain of NE Spain represents a lateral prolongation of the West Asturian-Leonese Zone. As other proximal sectors fringing NW Gondwana, the chain comprises a conÂformable and continuous FurongianâTremadocian transition, comprising a
J. Javier Álvaro +1 more
doaj +1 more source
Papers in Palaeontology, Volume 7, Issue 4, Page 1977-1993, November 2021., 2021 Abstract Conodonts are an extinct group of early vertebrates. Articulated fossils of their feeding apparatus (‘natural assemblages’) are rare, and preserved soft tissues vanishingly so. Here, a primitive conodont with preserved soft tissues is redescribed from the Waukesha Lagerstätte of Wisconsin, USA.
Duncan J. E. Murdock +2 more
wiley +1 more source
High-resolution carbon isotope stratigraphy of the Lower and Middle Ordovician succession of the Yangtze Platform, China [PDF]
Estonian Journal of Earth Sciences, 2023 Variation in the relative abundance of the stable carbon isotopes has been widely used to correlate Ordovician marine successions over the past two decades.
Rongchang Wu +8 more
doaj +1 more source
Symmetry in graptolite zooids and tubaria (Pterobranchia, Hemichordata)
Evolution &Development, Volume 23, Issue 6, Page 513-523, November 2021., 2021 Abstract Extant and fossil pterobranchs show distinct symmetry conditions of the individual zooids and their tubaria that are not necessarily comparable. The strict bilateral symmetry in the zooids of extant Cephalodiscida is modified to a considerable anatomical asymmetry in extant Rhabdopleurida. This type of left–right asymmetry can be recognized as
Jörg Maletz
wiley +1 more source
δ13C chemostratigraphy in the upper Tremadocian through lower Katian (Ordovician) carbonate succession of the Siljan district, central Sweden [PDF]
Estonian Journal of Earth Sciences, 2014 Based on δ13C data from two drillcores recovered from the Siljan district, we present a first continuous carbon isotope record of the upper Tremadocian–lower Katian limestone succession of central Sweden.
Oliver Lehnert +4 more
doaj +1 more source
Phylogenetic response of naraoiid arthropods to early–middle Cambrian environmental change
Palaeontology, Volume 64, Issue 1, Page 161-177, January 2021., 2021 Abstract The Cambrian Period, primarily known for animal life diversifying, experienced global extinctions. Pulses of extinction in Cambrian Series 2 are exemplified by the disappearance of archaeocyath sponges and olenelline and redlichiid trilobites.
Andrew D. Bond +2 more
wiley +1 more source