Results 91 to 100 of about 9,786 (214)

Analysis of the heterogeneity of the results of hydrogeochemical monitoring of the Aptian-Albian-Cenomanian complex in the fields of Western Siberia

open access: yesИзвестия высших учебных заведений: Нефть и газ
This paper presents findings on the reservoir water of the Aptian-Albian-Cenomanian water-bearing complexes within the Western Siberian Artesian Basin, based on long-term monitoring conducted at oil and gas fields.
A. G. Plavnik   +3 more
doaj   +1 more source

Albian ammonite biostratigraphy in Northwest Bulgaria

open access: yesGeologica Balcanica, 1991
The Albian Stage in Northwest Bulgaria is of more restricted occurrence compared to the other Lower Cretaceous Stages. It consists of marls interbedded by clayey limestones and by less common sandstones (Sumer Formation) and glauconitic sandstones, siltstones and marls (Malo Peštene Formation). The Albian sediments are of considerable thickness without
openaire   +1 more source

CRETACEOUS HIGH-LATITUDE TERRESTRIAL ECOSYSTEMS: AN EXAMPLE FROM ALEXANDER ISLAND, ANTARCTICA

open access: yesPublicación Electrónica de la Asociación Paleontológica Argentina, 2015
A thin wedge of non-marine sedimentary strata occurs within the largely marine Fossil Bluff Group on Alexander Island, Antarctica. The late Albian Triton Point Member of the Neptune Glacier Formation records deposition by braided and meandering river ...
David J. Cantrill
doaj  

Distributional patterns of Aptian-Albian paleoichthyofauna of Brazil and Africa based on Track Analysis

open access: yesAnais da Academia Brasileira de Ciências
The Aptian-Albian paleoichthyofauna in Brazil and Africa is quite diverse, yet their geographic patterns still require accounts. This work consists of a panbiogeographical analysis of paleoichthyofauna from Aptian-Albian through track analysis ...
THAÍS C.C. PARMÉRA   +3 more
doaj   +1 more source

Albian calcareous nannofossils from the Gault Clay of Munday’s Hill (Bedfordshire, England)

open access: yes, 1991
. Abundant and diverse Middle and Upper Albian nannofossil assemblages are present in the Gault Clay exposed at Munday’s Hill, Bedfordshire, England. The section was deposited between the first appearance datums of Tranolithus orionatus and Eiffellithus ...
Jason A. Crux
core   +1 more source

An angular uncorformity with middle Albian lacuna in the Urgonian Complex of Ranero (Ramales, basque-cantabrian región)

open access: yes, 1999
The Albian carbonate platform of Karrantza (Bizkaia, N Spain) displays an important angular unconformity whose corresponding lacuna encompasses most of the middle Albian and the lowermost part of the upper Albian.
López Horgue, Mikel A.   +3 more
core  

Short-term warming events in the boreal Albian (mid-Cretaceous)

open access: yes, 2011
Pronounced paleotemperature variations associated with the carbon cycle perturbations of oceanic anoxic events (OAEs 1b and 1d) are known to have occurred during the early and latest Albian.
Wilson, Paul   +9 more
core   +1 more source

Albian syndepositional block rotation and its geological consequences, Basque–Cantabrian Basin (western Pyrenees)

open access: yes, 2013
Stratigraphic, structural, palaeocurrent and palaeomagnetic analyses of Upper Albian deep-water deposits in and around the Deba block (Northern Iberia) are presented. Results indicate an anticlockwise vertical-axis rotation of this block by 35◦ during a
Agirrezabala, L. M., Dinarès-Turell, J.
core   +1 more source

Planktic foraminiferal turnover across the Aptian/Albian boundary and new criteria to define the GSSP for the base of the Albian Stage

open access: yes, 2012
Apart from the terminal Cretaceous extinction, the planktic foraminiferal turnover across the Aptian/Albian boundary interval is the most dramatic event in the Cretaceous evolutionary history of planktic foraminifera, with a change from large-sized and ...
B. T. Huber   +4 more
core   +1 more source

The genus Ptychoceras d'Orbigny in the Aptian-Albian of Patagonia and Antarctica

open access: yes, 2008
Aptian - Albian Ptychoceratidae of southern Patagonia and James Ross Island, Antarctica are described. They are represented by Ptychoceras adpressum (J. SOWERBY, 1814), P. forbesianum STOLICZKA, 1865 and P. hamaimense PERVINQUIÈRE 1907. P.
Medina, Francisco Alberto   +1 more
core   +1 more source

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