Results 21 to 30 of about 455 (173)

Iron microbial communities in Belgian Frasnians carbonate mounds

Facies, 2001
The Belgian Frasnian carbonate mounds occur in three stratigraphic levels in an overall backstepping succession. Petit-Mont and Arche Members form the famous red and grey “marble” exploited for ornamental stone since Roman times. The evolution and distribution of the facies in the mounds is thought to be associated with ecologic evolution and relative ...
Boulvain, Frédéric, De Ridder, C., Mamet, B., Préat, A., Gillan, D.   +4 more
openaire   +2 more sources

Revision of the Late Devonian ptyctodonts (Vertebrata, Placodermi) from southern Poland [PDF]

Estonian Journal of Earth Sciences
New studies on Frasnian ptyctodonts, including the revision of historic material in addition to the description of new material, have resulted in the detailed description of two species of Ptyctodus (Ptyctodus obliquus, Ptyctodus kielcensis), eight ...
Katarzyna Grygorczyk, Olga Wilk, Piotr Szrek   +2 more
doaj   +1 more source

Stages of development of the Middle-Late Devonian ICHTHYOFAUNA (Placodermi: Antiarchi) from the northern Eurasia

Известия высших учебных заведений: Геология и разведка, 2019
Three stages, namely Middle Devonian (I), Early Late Devonian (II) and Late Late Devonian (III), are distin-guished in the evolution of antiarchs (Placodermi, Antiarchi) in the Middle-Late Devonian of Northern Eurasia.
S. V. Moloshnikov
doaj   +1 more source

The outcrop of the Middle Ordovician (Darriwilian stage) and Upper Devonian (Frasnian stage) Yakhnovo as a unique geological feature in the East of the Main Devonian Field

Vestnik MGTU
At present, within the Baltic-Ladoga structural-facies zone characterized by the distribution of coastal-marine and coastal-continental deposits of the Lower and Middle Frasnian outcrops of bedrock are practically lost.
Tsinkoburova M. G., Smirnov D. M., Baranovskaya M. L.   +2 more
doaj   +1 more source

GIVETIAN–FRASNIAN BOUNDARY CONODONTS FROM KERMAN PROVINCE, CENTRAL IRAN

Rivista Italiana di Paleontologia e Stratigrafia, 2013
The Middle - Late Devonian boundary is investigated based on twenty-two conodont species and subspecies from three sections in the north and west of Kerman, southeastern central Iran.
HOSSEIN GHOLAMALIAN, VACHIK HAIRAPETIAN, NAHID BARFEHEI, SOHEYLA MANGELIAN, PARVANEH FARIDI   +4 more
doaj   +1 more source

Geohistorical analysis of the northern part of the Pai-Khoi carbonate parautochthone in Late Devonian–Carboniferous

Литосфера, 2020
Research subject. This article focuses on the geological structure of the northern part of the Pai-Khoi carbonate parautochthone.Materials and methods. The study was based on the data obtained on the key sections of the North-Western Pai-Khoi.
D. A. Gruzdev, A. I. Gerasimova, A. V. Zhuravlev, Ya. A. Vevel   +3 more
doaj   +1 more source

Early Frasnian acanthodians from central Iran [PDF]

, 2006
Hairapetian, Vachik, Valiukevičius, Juozas, Burrow, Carole J. (2006): Early Frasnian acanthodians from central Iran.
Hairapetian, Vachik, Valiukevičius, Juozas, Burrow, Carole J.   +2 more
openaire   +3 more sources

LATE DEVONIAN-CARBONIFEROUS CONODONTS FROM EASTERN IRAN

Rivista Italiana di Paleontologia e Stratigrafia, 1999
Conodont data from acid-leaching 110 samples from two Late Devonian-Carboniferous areas in the Shotori Range (Tabas region) of eastern Iran are presented.
MEHDI YAZDI
doaj   +1 more source

High-Resolution Late Devonian Magnetostratigraphy From the Canning Basin, Western Australia: A Re-Evaluation

Frontiers in Earth Science, 2021
Late Devonian time was a period of rapid upheaval in the Earth system, including climate change, sea level changes, widespread ocean anoxia, and the Frasnian-Famennian mass extinction; the cause(s) of these changes remain(s) uncertain.
Theodore Green, Sarah P. Slotznick, Plinio Jaqueto, Timothy D. Raub, Eric Tohver, Ted E. Playton, Peter W. Haines, Joseph L. Kirschvink, Joseph L. Kirschvink, Roger M. Hocking, Paul Montgomery   +10 more
doaj   +1 more source

The Frasnian deposits in the Bol’shaya Nadota River region (Sub-Polar Urals) - stratigraphy and depositional enviroment

Литосфера, 2016
The main features of the Givetian-Frasnian shoal deposits of the Sub-Polar Urals (Matyashor formation) are considered. The study part of the section corresponds to varcus - rhenana zones on the basis of conodonts.
D. A. Gruzdev, M. A. Soboleva, D. B. Sobolev, A. V. Zhuravlev   +3 more
doaj   +2 more sources