Results 61 to 70 of about 1,022 (197)
Palaeontology, Volume 69, Issue 5, September/October 2026.Abstract Heterostracans are pivotal in examining the evolution of feeding and the head in jawed vertebrates as the stem‐gnathostomes in which the oral apparatus is more commonly preserved. However, most analyses of their feeding, especially recent studies using modern 3D imaging methods, have focused on a specific subgroup, the Pteraspidiformes ...
Lisa Schnetz +9 more
wiley +1 more source
Early Ordovician (Tremadocian and Floian) graptolites from the Than Sa Formation, northeast Vietnam
, 2017 The lower Palaeozoic marine succession of NE Vietnam accumulated on the South China plate. Despite historical works dating to French colonial times, the stratigraphy and palaeontology of the succession is poorly constrained.
TOSHIFUMI KOMATSU +9 more
core +1 more source
Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure
Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1213-1242, July 2026.Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark +8 more
wiley +1 more source
Centimetre-scale variability of redox-sensitive elements in Tremadocian black shales from the eastern Baltic Palaeobasin [PDF]
Estonian Journal of Earth Sciences, 2014 The high-resolution study of vertical geochemical variability of shallow-water Tremadocian black shales of the Türisalu Formation targeted two drill core sections from Suur-Pakri Island, NW Estonia.
Rutt Hints +5 more
doaj +1 more source
Palaeoscolecids from the early Cambrian Guanshan biota, Yunnan Province, China
Papers in Palaeontology, Volume 12, Issue 1, January/February 2026.Abstract Palaeoscolecidomorphs (Palaeoscolecida and Cricocosmiidae) are widespread early Palaeozoic worms crucial to understanding the early evolution of Ecdysozoa. They are well known from the early–middle Cambrian of the Yangtze Platform of South China, but research has disproportionately focused on the well‐known Cambrian Stage 3 Chengjiang biota of
Xiaomei Shi +3 more
wiley +1 more source
Papers in Palaeontology, Volume 11, Issue 5, September/October 2025.Abstract The Australian Cambrian stratigraphic record is one of the most complete for any continent. However, there is a general division, with older Cambrian rocks in South Australia (predominantly Terreneuvian, Stage 2 to Miaolingian, Wuliuan) and younger rocks in northern Australia (mostly latest Series 2, Stage 4 and younger), with minimal ...
Marissa J. Betts +5 more
wiley +1 more source
A new genus of middle Tremadocian orthoceratoids and the Early Ordovician origin of orthoceratoid cephalopods [PDF]
, 2008 The cephalopods of the subclass Orthoceratoidea, which are termed “orthoceratoids” herein, are a group that remains “the last unexplored wilderness in the Cephalopoda” (Flower 1962: 23).
Kroger, B.
core
Biostratigraphy of Acritarchs and Chitinozoans in Ordovician Strata from the Fazel Abad Area, Southeastern Caspian Sea, Alborz Mountains, Northern Iran: Stratigraphic Implications [PDF]
Journal of Sciences, Islamic Republic of Iran, 2017 Sixty-four surface samples from the Lower Palaeozoic rock units (mainly Lalun,Abastu and Abarsaj formations) near Kholin-Darreh village in the Fazel Abad area,southeastern the Caspian Sea, Northern Iran, were analyzed to determine their agerelationships.
M. Ghavidel-syooki
doaj
Distribution of phosphorus in the Middle and Upper Ordovician Baltoscandian carbonate palaeobasin [PDF]
Estonian Journal of Earth Sciences, 2010 Baltoscandian Middle and Upper Ordovician carbonate rocks are relatively poor in phosphorus, with the P2O5 content of 0.05–0.5%, rarely exceeding 1%. Phosphorus distribution in the Ordovician carbonate succession shows spatial and temporal variations. In
Leho Ainsaar +3 more
doaj +1 more source
Rivista Italiana di Paleontologia e Stratigrafia, 2020 Cambrian to Lower Ordovician acritarchs and Lower Ordovician conodont species have been recorded from the Furuhäll Section at Köpingsklint on Öland, Sweden. The acritarchs are represented by three different microfloras.
GABRIELLA BAGNOLI +2 more
doaj