Early Tremadocian graptolites from the Arivechi area, Sonora, northern Mexico [PDF]
Estonian Journal of Earth Sciences, 2023 Graptolites from the early Tremadocian Anisograptus matanensis Biozone are identified from east-central Sonora, northwestern Mexico, within a carbonate-shelf succession deposited on the southwestern continental shelf margin of Laurentia.
Dulce Raquel Reyes-Montoya +5 more
doaj +7 more sources
Discovery of the messaoudensis–trifidum acritarch assemblage (upper Tremadocian–lower Floian, Lower Ordovician) in the subsurface of Morocco [PDF]
Estonian Journal of Earth Sciences, 2015 The upper Tremadocian to lower Floian messaoudensis–trifidum acritarch assemblage was first described from the Skiddaw Group of England and subsequently from several localities on the Gondwanan margin that were positioned in high southern latitudes ...
Hendrik Nowak +3 more
doaj +3 more sources
EVENT STRATIGRAPHY AND CORRELATION PROBLEMS OF THE ORDOVICIAN STRATA OF GORNY ALTAI AND SALAIR [PDF]
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 +5 more
doaj +3 more sources
Tremadocian (Ordovician) reclined graptolites from Baishan, North China [PDF]
Estonian Journal of Earth Sciences, 2023 The Erdaopuzi section in the Baishan area of Jilin Province, northeast China, contains abundant late Tremadoc graptolites. However, there are some taxonomic controversies regarding the characters of the hand specimens that are difficult to identify.
Ming Li +3 more
doaj +2 more sources
Early Ordovician (Tremadocian) brachiopods from the Eastern Alborz Mountains, Iran [PDF]
Estonian Journal of Earth Sciences, 2011 Six linguliform and two rhynchonelliform brachiopods, including three new species Eurytreta ahmadii, Wahwahlingula kharbashi and Nanorthis bastamensis are described from Tremadocian strata (Paltodus deltifer deltifer conodont Biozone) in the Deh-Molla ...
Leonid E. Popov +2 more
doaj +3 more sources
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 +2 more sources
Solutan echinoderms from the Fezouata Shale Lagerstätte (Lower Ordovician, Morocco): diversity, exceptional preservation, and palaeoecological implications [PDF]
Frontiers in Ecology and Evolution, 2023 In the Lower Ordovician of Morocco, solutan echinoderms are relatively common, locally abundant, geographically widespread (Central and Eastern Anti-Atlas), and biostratigraphically long-ranging (late Tremadocian–mid Floian) components of the Fezouata ...
Christophe Dupichaud +8 more
doaj +2 more sources
First record of the Ordovician fauna in Mila-Kuh, eastern Alborz, northern Iran [PDF]
Estonian Journal of Earth Sciences, 2015 Restudy of the Cambrian–Ordovician boundary beds, traditionally assigned to the Mila Formation Member 5 in Mila-Kuh, northern Iran, for the first time provides convincing evidence of the Early Ordovician (Tremadocian) age of the uppermost part of the ...
Mohammad-Reza Kebria-ee Zadeh +4 more
doaj +2 more sources
Evaluation of a New Zealand Tremadocian trilobite
Geological Magazine, 1979 Dionide hectori Reed, 1926, is shown on the basis of new collections from the type area in New Zealand to be a Tremadocian ceratopygide close to Hysterolenus. The species was placed in Taihungshania by Kobayashi (1941).
Anthony Wright (19588555)
core +4 more sources
NEW LINGULIFORMEAN BRACHIOPODS FROM THE LOWER TREMADOCIAN (ORDOVICIAN) OF THE BRABANT MASSIF, BELGIUM, WITH COMMENTS ON CONTEMPORANEOUS FAUNAS FROM THE STAVELOT–VENN MASSIF [PDF]
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 +2 more sources