The late Katian Elkhorn event: precursor to the Late Ordovician mass extinction [PDF]
Estonian Journal of Earth Sciences, 2023 The late Katian Elkhorn event is a biogeochemical perturbation preceding the Late Ordovician mass extinction (LOME) with an exceptional record in the United States (U.S.).
Patrick I. McLaughlin +8 more
doaj +2 more sources
New Early Katian species of Leptestiidae and Hesperorthidae (Brachiopoda) from Lithuania [PDF]
Estonian Journal of Earth Sciences, 2016 A new leptestiid brachiopod species of the genus Sampo and a hesperorthid species of the genus Dolerorthis are described from the Early Katian Oandu Stage of southern Lithuania.
Juozas Paškevičius, Linda Hints
doaj +3 more sources
Katian (Upper Ordovician) conodonts from Wales [PDF]
Palaeontology, 2013 Middle and upper Katian conodonts were previously known in the British Isles from relatively small collections obtained from a few localities. The present study is mainly based on 17 samples containing more than 17 000 conodont elements from an ...
An +85 more
core +4 more sources
Pathways and mechanisms of Late Ordovician (Katian) faunal migrations of Laurentia and Baltica [PDF]
Estonian Journal of Earth Sciences, 2015 Late Ordovician strata within the Cincinnati Basin record a mass faunal migration event during the C4 and C5 depositional sequences. The geographic source region for the invaders and the paleoceanographic conditions that facilitated dispersal into the ...
Adriane R. Lam, Alycia L. Stigall
doaj +2 more sources
Conodont biostratigraphy of the Oandu Stage (Katian, Upper Ordovician) in NE Estonia [PDF]
Estonian Journal of Earth Sciences, 2017 Conodonts from the type region of the Oandu Regional Stage (Katian, Upper Ordovician) in NE Estonia were studied. Here, the lower boundary of the stage corresponds to a discontinuity surface at the base of the Hirmuse Formation and, in conodont ...
Peep Männik
doaj +2 more sources
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 +2 more sources
Upper Sandbian–lower Katian bio- and chemostratigraphy in the Pajevonys-13 core section, Lithuania [PDF]
Estonian Journal of Earth Sciences, 2016 The succession of five formations (Auleliai, Vilučiai, Alvitas, Šakiai, Jakšiai) corresponding to the upper Sandbian and lower Katian in southern Lithuania is dated based on new bio- and chemostratigraphical data from the Pajevonys-13 core section.
Linda Hints +4 more
doaj +3 more sources
A possible Laurentian volchoviid ophiocistioid from the Katian of southwestern Ohio [PDF]
Journal of Paleontology, 2021 The Cincinnatian (Katian) of the Cincinnati Tri-State area is widely regarded as one of the most fossiliferous sections known (Meyer and Davis, 2009). Echinoderms from these strata include well-described asteroids, crinoids, cyclocystoids, edrioasteroids, glyptocystoids, mitrates, and ophiuroids.
William I. Ausich, Jeffrey R. Thompson
openaire +2 more sources
A diverse Hirnantian scolecodont assemblage from northern Estonia and resilience of polychaetes to the end-Ordovician mass extinction [PDF]
Estonian Journal of Earth Sciences, 2023 We report the discovery of a rich assemblage of latest Katian and Hirnantian scolecodonts (polychaete jaws) from a new OrdovicianâSilurian boundary outcrop in the Reinu quarry, northern Estonia.
Olle Hints, Petra Tonarová
doaj +1 more source
Middle–Late Ordovician organic- walled phytoplankton from Sweden: diversity and early radiation [PDF]
Estonian Journal of Earth Sciences, 2023 The Borenshult-1 core, drilled in the vicinity of Motala, east of Lake Vättern in south central Sweden, comprises a well-dated and nearly complete succession of marine marly carbonates deposited relatively close to land. The 34 core samples analyzed for
Claudia V. Rubinstein, Vivi Vajda
doaj +1 more source