Results 51 to 60 of about 35,895 (262)
Uppermost Albian biostratigraphy and chronostratigraphy [PDF]
Carnets de géologie (Notebooks on geology), 2009 The Albian Stage is the highest chronostratigraphic unit of the Lower Cretaceous Series and underlies the Cenomanian Stage of the Upper Cretaceous Series. The Albian is divided into three substages, each of which is composed of two or three zones based on distinctive and phylogenetically related ammonite assemblages.
openaire +5 more sources
Geologos, 2017 Two sections of strata assigned to the Amran Group at Jabal Salab and Jabal Yam in the eastern Sana’a governorate were sampled and correlated. These sections are part of a carbonate platform that extends from the city of Marib in the east to Naqil Ibn ...
Al-Wosabi Mohammed +2 more
doaj +1 more source
Note complementaire sur les echinodermes ordoviciens de Sierra Morena
Estudios Geologicos, 1986 [fr] Une nouvelle espéce du genre Calix est décrite, le genre Batalleria est redécrit, la présence de Phlyctocystis dans les Monts de Toléde-Sierra Morena est confirmée, et celle de Destombesia est signalée.
J. Chauvel, B. Meléndez
doaj +1 more source
Concepts and methods of biostratigraphy [PDF]
New Zealand Journal of Geology and Geophysics, 1978 (1978). Concepts and methods of biostratigraphy. New Zealand Journal of Geology and Geophysics: Vol. 21, No. 4, pp. 537-537.
openaire +2 more sources
Quantitative foraminiferal and palynomorph biostratigraphy of the Paleogene in the southwestern Barents Sea [PDF]
, 2004 The stratigraphic distribution of both foraminifera and dinoflagellate cysts is recorded from the Paleocene to Eocene Torsk Formation in 12 petroleum exploration wells drilled in the southwestern Barents Sea.
Gradstein, F.M. +3 more
core
Un silicoflagelado en el Albiano medio de la Cuenca Austral, Argentina [PDF]
, 2015 Calcareous nannofossil biostratigraphic investigations of Cretaceous sediments within the southern high latitude Austral Basin, Argentina, have revealed the presence of a fragment of a silicoflagellate possibly belonging to the species Variramus ...
Perez Panera, Juan Pablo
core +1 more source
CRETACEOUS CONCHOSTRACANS FROM ALAGOAS BASIN (NORTHEASTERN BRAZIL)
Publicación Electrónica de la Asociación Paleontológica Argentina, 2015 Conchostracans from an outcrop of the Maceió Formation (Aptian-Albian, Alagoas Basin) located at Japaratinga Beach (Alagoas State, Brazil) are studied.
Mitsuru Arai, Ismar de Souza Carvalho
doaj
Climate warming, euxinia and carbon isotope perturbations during the Carnian (Triassic) Crisis in South China [PDF]
, 2016 The Carnian Humid Episode (CHE), also known as the Carnian Pluvial Event, and associated biotic changes are major enigmas of the Mesozoic record in western Tethys.
Bond, D.P.G. +8 more
core +2 more sources
Triassic radiolarian biostratigraphy [PDF]
Geological Society, London, Special Publications, 2010 Abstract This paper summarizes 30 years of research on the biostratigraphy of Triassic radiolarians and presents a correlation of currently-used radiolarian zonations established in North America, Europe, Japan and Far East Russia. An up-to-date stratigraphic distribution of all hitherto described and still valid Triassic genera is provided ...
Špela Goričan +3 more
openaire +2 more sources
The Initial Opening of the Drake Passage Occurred During ca. 62‐59 Ma
Geophysical Research Letters, Volume 52, Issue 7, 16 April 2025.Abstract Although the Drake Passage has been considered a critical component of ocean circulation and climate, its initial opening age remains controversial due to the weak constraints on the paleoposition of the Antarctic Peninsula. Here, new zircon U‐Pb geochronological studies are conducted on the Barchans Islands, providing a critical age ...
Liang Gao +16 more
wiley +1 more source