Results 11 to 20 of about 58,643 (272)

Reappraisal of the Silurian placoderm Silurolepis and insights into the dermal neck joint evolution [PDF]

open access: yesRoyal Society Open Science, 2019
Silurolepis platydorsalis, a Silurian jawed vertebrate originally identified as an antiarch, is here redescribed as a maxillate placoderm close to Qilinyu and is anteroposteriorly reversed as opposed to the original description.
You-an Zhu, Jing Lu, Min Zhu
doaj   +1 more source

NITROGEN ISOTOPES IN KUKERSITE AND BLACK SHALE IMPLYING ORDOVICIAN-SILURIAN SEAWATER REDOX CONDITIONS; pp. 60–75 [PDF]

open access: yesOil Shale, 2013
For the first time data on nitrogen isotopes from the Ordovician-Silurian sedimentary rocks of the Baltic Basin are reported. Supplementary samples come from several regions worldwide.
ENLI KIIPLI, TARMO KIIPLI
doaj   +1 more source

Ostracods of the Ordovician–Silurian boundary beds: Jūrmala core (Latvia) and its implications for Baltic stratigraphy [PDF]

open access: yesEstonian Journal of Earth Sciences, 2020
Ostracods of the Ordovician and Silurian transition interval in the Jūrmala section, Latvia, were studied. The diverse pre-Hirnantian ostracod assemblage is replaced by the Harpabollia harparum association that has been recorded across the Baltoscandian
Tõnu Meidla   +3 more
doaj   +1 more source

Persistent global marine euxinia in the early Silurian

open access: yesNature Communications, 2020
The second pulse of the Late Ordovician mass extinction occurred around the Hirnantian-Rhuddanian boundary (~444 Ma) and has been correlated with expanded marine anoxia lasting into the earliest Silurian.
R. Stockey   +5 more
semanticscholar   +1 more source

Three-dimensionally preserved soft tissues and calcareous hexactins in a Silurian sponge: implications for early sponge evolution [PDF]

open access: yesRoyal Society Open Science, 2019
Sponges (Porifera), as one of the earliest-branching animal phyla, are crucial for understanding early metazoan phylogeny. Recent studies of Lower Palaeozoic sponges have revealed a variety of character states and combinations unknown in extant taxa ...
Ardianty Nadhira   +8 more
doaj   +1 more source

A new mid-Silurian aquatic scorpion—one step closer to land?

open access: yesBiology Letters, 2015
Dave M Rudkin   +2 more
exaly   +2 more sources

A revision of Silurian corals (Anthozoa: Heliolitoidea) from the collection of the National Museum of Natural History, NAS of Ukraine (Kyiv)

open access: yesGeo&Bio, 2023
The collection of Silurian heliolitoid corals revised in this study has been assembled by the first author (V.G.) for four decades. The material was collected predominantly from Silurian outcrops and borehole cores in the Middle Dnister area. Some of the
Volodymyr Grytsenko, Kseniia Rudenko
doaj   +1 more source

Cosmopolitan myodocope ostracods from the Silurian of Uzbekistan, Central Asia

open access: yesBSGF - Earth Sciences Bulletin, 2020
Four species of myodocope ostracod are documented from the Silurian Ludlow Series of the Aburtkan gorge on the southern slope of Dzhalpak Mountain, Uzbekistan: namely, Parabolbozoe bohemica (Barrande, 1872), Bolbozoe anomala Barrande, 1872 ...
Mikhailova Elena   +6 more
doaj   +1 more source

PROSPECTS OF LITHUANIAN SILURIAN SHALE GAS, BALTIC SEDIMENTARY BASIN; pp. 357–372 [PDF]

open access: yesOil Shale, 2016
The Baltic sedimentary basin contains numerous hydrocarbon fields in Lithuania. The Lower Silurian shales are considered as potential for shale gas exploration. The thickness of shale units within the oil window ranges from 115 to 180 m in west Lithuania.
SAULIUS SLIAUPA   +6 more
doaj   +1 more source

Examining abnormal Silurian trilobites from the Llandovery of Australia [PDF]

open access: yesPeerJ, 2022
Abnormal trilobites present insight into how arthropods with fully biomineralised exoskeletons recovered from injuries, genetic malfunctions, and pathologies.
Russell D.C. Bicknell, Patrick M. Smith
doaj   +2 more sources

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