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Lower Cretaceous ammonites from the Neuquén Basin, Argentina: A Hauterivian Olcostephanus fauna
(Academic Press Ltd - Elsevier Science Ltd, 2001-12)
The olcostephanid fauna of the Olcostephanus (O.) laticosta [formerly O. (O.) leanzai] Subzone (Agrio Formation) represents the last of four discrete invasions of olcostephanid ammonites into the Neuquén Basin of west-central ...
Lower Cretaceous ammonites from the Neuquén Basin, Argentina: the Hauterivian neocomitid genusHoplitocrioceras (Giovine, 1950)
(Academic Press Ltd - Elsevier Science Ltd, 2001-12)
Hoplitocrioceras is a poorly-known ammonite genus of late Early Hauterivian age that may be endemic to the Neuquén Basin Argentina where it occurs at a clearly defined horizon in the Agrio Formation. It is an unusual genus ...
Lower Cretaceous ammonites from the Neuquén Basin, Argentina: The Hauterivian genus Holcoptychites
(Academic Press Ltd - Elsevier Science Ltd, 2003-12)
Holcoptychites is known only from the Neuquén Basin, Argentina, but appears close to the more widespread genera Jeanthieuloyites and Spitidiscus. Thus it is placed in the subfamily Spitidiscinae (Family Holcodiscidae). ...
Lower Cretaceous ammonites from the Neuquén Basin, Argentina: The Hauterivian genus Spitidiscus
(Academic Press Ltd - Elsevier Science Ltd, 2012-02)
Spitidiscus is a widely-distributed Hauterivian genus that briefly invaded the Neuquén Basin, Argentina, in mid Hauterivian times, well after it first evolved in the west Tethyan area. Its appearance in Argentina is linked ...
First U-Pb SHRIMP age for the Pilmatué Member (Agrio Formation) of the Neuquén Basin, Argentina: Implications for the Hauterivian lower boundary
(Academic Press Ltd - Elsevier Science Ltd, 2016-03)
Ammonite-based biostratigraphic schemes for the Lower Cretaceous are fairly well refined across the world, from the standard zonation in the West Mediterranean province to the Boreal and Austral provinces in the northern ...
First U-Pb SHRIMP age of the Hauterivian stage, Neuquén Basin, Argentina
(Pergamon-Elsevier Science Ltd, 2008-07)
A high-resolution ion-microprobe (SHRIMP) U-Pb zircon age from a tuff layer intercalated in the ammonoid bearing sedimentary succession of the Neuquén Basin in Argentina provides a robust geochronologic date to add to the ...
An integrate analysis of an Hauterivian coral biostrome from the Agrio Formation, Neuquén Basin, west-central Argentina
(Elsevier, 2013-02)
A coral biostrome from the lower Hauterivian of the Neuquén Basin, west-central Argentina, was examined in detail. Taxonomic analysis established it as a monospecific assemblage of the scleractinian colonial coral Stereocaenia ...
Lower Cretaceous corals from the Agrio Formation, Neuquén Basin, west-central Argentina: Family Columastraeidae
(Academic Press Ltd - Elsevier Science Ltd, 2021-08)
This contribution presents the second part of the results of an ongoing systematic revision of the coral fauna from mixed carbonate-siliciclastic sedimentary facies of the Agrio Formation (upper Valanginian–upper Hauterivian) ...
Lower Cretaceous ammonites from the Neuquén Basin, Argentina: A new heteromorph fauna from the uppermost Agrio Formation
(Academic Press Ltd - Elsevier Science Ltd, 2012-06)
Although the Agrio Formation (Valanginian-Early Barremian) yields rich ammonite faunas at many levels, the highest beds are very sparsely fossiliferous. However, intensive collecting over the years has yielded a sparse ...
The Gastropod family Aporrhaidae in the lower cretaceous of the Neuquén basin, west-central Argentina
(Paleontological Society, 2014-12)
The gastropod fauna of the Lower Cretaceous of the Argentinian Neuquén Basin contains three aporrhaid species. Protohemichenopus neuquensis Camacho, 1953 is the most abundant, longest-lived, and most geographically widespread ...