Results 41 to 50 of about 18,619 (157)
On the graptolite schist's formation, Silurian-Lower Devonian, in the Carpatho-Balkanides of eastern Serbia [PDF]
Geološki Anali Balkanskoga Poluostrva, 2005 The fabric of the Silurian and a part of the Lower Devonian in the Carpatho-Balkanides of eastern Serbia, i.e. in two large geotectonic units, the Kučaj Unit (Getic) and the Luznica Unit (West Kraishte), is reviewed in this paper.
Krstić Branislav +2 more
doaj +1 more source
The trace fossil Zoophycos from the Silurian of Estonia [PDF]
Estonian Journal of Earth Sciences, 2015 Trace fossils of the ichnogenus Zoophycos have been described for the first time from the Silurian of Baltica. They occur in Llandovery pure limestones of middle Estonia and in Ludfordian argillaceous limestones and early Pridoli crinoid grainstones of ...
Olev Vinn, Ursula Toom
doaj +1 more source
Petroleum, 2023 A significant phase of global warming appeared during the Llandovery and productive Silurian hot shale was preserved all over the world. The lower Silurian shale is the main effective source rock for most of the Paleozoic hydrocarbon in Iran and the ...
Ali Rahmani +2 more
doaj +1 more source
Silurian succession from North Africa : Sedimentology and thermal history for a new era of hydrocarbon exploration [PDF]
, 2020 PhD project: Silurian succession from North Africa - Sedimentology, ichnology and thermal history for a new era of hydrocarbon ...
Djouder, Hocine
core +1 more source
The oldest ascocerid cephalopod from the Silurian of Estonia and notes on the biogeography of the order Ascocerida (class Cephalopoda) [PDF]
Estonian Journal of Earth Sciences, 2016 The early Palaeozoic order Ascocerida is a group of morphologically unique and rare cephalopods known from the Ordovician and Silurian rocks of Avalonia, Baltica, Laurentia and Perunica.
Martina Aubrechtova, Tõnu Meidla
doaj +1 more source
The Anatomical Record, EarlyView.Abstract Dental plates are pivotal in the lungfish paleontological record, constituting highly mineralized structures resilient to diagenetic processes. This study provides a detailed description and quantitative shape analysis of 95 newly discovered Gnathorhiza sp. dental plates from the Middle–Late Permian Corumbataí Formation, Brazil.
Mauro B. S. Lacerda +4 more
wiley +1 more source
High resolution carbon isotope stratigraphy of the basal Silurian stratotype (Dob's Linn, Scotland) and its global correlation [PDF]
, 1997 Since its designation as the Global Stratotype Section and Point (GSSP) for the base of the Silurian System, the choice of Dob's Linn, Southern Scotland, has received criticism due to the difficulties of relating its well constrained graptolite ...
Marshall, J.D. +10 more
core +1 more source
An updated correlation of the Silurian strata in Estonia [PDF]
Estonian Journal of Earth SciencesThe correlation of the Silurian succession of Estonia with the global standard has long been considered reliable. However, new information, particularly on the distribution of microfossils, has changed our understanding of the Silurian stratigraphy in ...
Peep Männik, Tõnu Meidla, Olle Hints
doaj +1 more source
Developmental Dynamics, EarlyView.Abstract Background The dentigerous jawbones of a 423‐million‐year‐old stem chondrichthyan (ischnacanthid acanthodian) carry a characteristic combination of multi‐row non‐shedding white teeth with brownish overgrowing denticles. The color distinction makes it a good model for observing the interaction between two odontode lineages, but the nature of ...
Jia‐Cih Kang +3 more
wiley +1 more source
The position of graptolites within Lower Palaeozoic planktic ecosystems. [PDF]
, 1993 An integrated approach has been used to assess the palaeoecology of graptolites both as a discrete group and also as a part of the biota present within Ordovician and Silurian planktic realms.
Underwood, Charlie J. +1 more
core +1 more source