Results 51 to 60 of about 5,019 (222)

Scottish Carboniferous conodonts [PDF]

open access: yesTransactions of the Edinburgh Geological Society, 1960
The Scottish Carboniferous conodonts described by Hinde and figured by Smith in 1900 are refigured and redescribed. Additional specimens from the John Smith collection and from the writer's own collection are described. Sixteen genera of conodonts are shown to be present in the Scottish Carboniferous and thirty species, of which seventeen are new, are ...
openaire   +1 more source

A phylogeny for Heterostraci (stem‐gnathostomes)

open access: yesPapers in Palaeontology, Volume 11, Issue 5, September/October 2025.
Abstract The armoured jawless fishes (‘ostracoderms’) are major and widespread components of middle Palaeozoic ecosystems. As successive branches on the gnathostome stem lineage, they represent the early sequences of vertebrate evolution, including the assembly of the vertebrate skeleton. This is predicated, however, on understanding of their diversity
Emma Randle   +2 more
wiley   +1 more source

Limitotipes of Lower Sakmarian and Artinskian stages boundary in the Urals

open access: yesЛитосфера, 2015
The section Usolka and duplicating its section Dal’ny Tulkas (Bashkortostan) are proposed as the stratotypes of the Lower Sakmarian stage boundary and Lower Artinskian stage boundary of the International Stratigraphic scale.
V. V. Chernykh, B. I. Chuvashov
doaj   +2 more sources

Dynamics of the conodont diversity in the Late Devonian–Early Carboniferous (Famennian–Serpukhovian)

open access: yesЛитосфера, 2019
Subject. The article is aimed to evaluate of the conodont diversity dynamics at the species level in the Famennian – Serpukhovian interval.Materials and methods.
A. V. Zhuravlev
doaj   +1 more source

Reflection of global events Frasnian epoch in the section of the western slope Polar Urals

open access: yesЛитосфера, 2018
For the first time we carried out a detailed comprehensive study of Frasnian stage in the lower сurrent of the Malaya Usa River located within the Eletskaya structural-formational zone of the Polar Urals.
Dmitrii B. Sobolev, Marina A. Soboleva
doaj   +1 more source

Strontium Isotope Stratigraphy of the Middle–Upper Devonian: Data for the Conodonts from the Central Part of the Volga–Ural Petroleum Province

open access: yesGeoresursy
This study presents the first 87Sr/86Sr isotope data for the Middle–Upper Devonian strata of the central part of the Volga–Ural petroleum province, which are based on ramiform conodont elements.
D. K. Nurgaliev   +8 more
doaj   +1 more source

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