Open AccessDOI
Ammonites and stratigraphy of a Lower Bajocian (Middle Jurassic) section in Sierra Chacaico (Neuquén Basin, Argentina)
TLDR
In this article, a Lower Bajocian section from southern Neuquen Basin (Argentina), with three faunal horizons (sphaeroceroides, submicrostoma and giebeli horizons) in the Singularis and Giebelis zones, is described.Abstract:
A Lower Bajocian section from southern Neuquen Basin (Argentina), with 3 faunal horizons (sphaeroceroides, submicrostoma and giebeli horizons) in the Singularis and Giebeli zones, is described. The Giebeli Zone is relatively thick in contrast with the section at Paso del Espinacito. The ammonite species Chondromileia submicrostoma (Gottsche) is quite variable and consists of large specimens. For the first time well preserved and complete macroconch specimens of Emileia multiformis (Gottsche) are described. It is shown that the lithostratigraphic and biostratigraphic boundaries are not coincident in the studied section.read more
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Journal ArticleDOI
A new primitive Neornithischian dinosaur from the Jurassic of Patagonia with gut contents.
Leonardo Salgado,José Ignacio Canudo,Alberto C. Garrido,Miguel Moreno-Azanza,Leandro Carlos Alcides Martinez,Rodolfo A. Coria,José Manuel Gasca +6 more
TL;DR: Despite showing a general stegosaurian appearance, the extensive phylogenetic analysis carried out depicts Isaberrysaura mollensis gen. et sp.
Journal ArticleDOI
Shrimps and leaves: Phytodetrital pulses and bioturbation in deposits of a river-dominated delta (Middle Jurassic Lajas Formation, Neuquén Basin, Argentina)
TL;DR: The Middle Jurassic Lajas Formation of the Neuquen Basin (Argentina) records mainly deltaic sedimentation, and the precise role of the depositional mechanisms involved is still controversial.
Journal ArticleDOI
On New Records of Cephalopod Jaws from the Upper Bajocian (Middle Jurassic) of the Northern Caucasus (Russia, Karachay-Cherkessia)
TL;DR: In this paper, two isolated valves of aptychi which are considered to be ammonoid lower jaws are assigned to the superfamilies Haploceratoidea and Stephanoceratosidea, and two upper jaws likely belonged to ammonites with aptychus-type jaw apparatus.
Lower Bajocian (Middle Jurassic) Ammonites of the Manflas area in Atacama Province, Northern Chile, Part 2: Giebeli Zone
TL;DR: In this paper, ammonite faunas from the singularis horizon (Zitteli Subzone) and sphaeroceroides horizon (Altecostata Subzone), of the Singularis Zone are described.
Journal ArticleDOI
Early Bajocian marine Gastropods from the Neuquén Basin, Argentina
TL;DR: Nine gastropod species are reported from early Bajocian marine deposits at two localities in the Neuquén Basin, supplying the first detailed documentation of six Gastropod families from the Middle Jurassic of Argentina at that time.
References
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Journal ArticleDOI
The Marine Jurassic of Argentina: A Biostratigraphic Framework
TL;DR: In Argentina the best and most complete marine Jurassic succession is exposed between 32° and 39° S, along a N-S belt roughly coincident with the border with Chile as mentioned in this paper.
El Jurásico de la Argentina y sus amonites
TL;DR: The Jurassic of Argentina and its ammonites have been fundamental for improving the knowledge of the Argentinean Jurassic as discussed by the authors, since 1870 they were fundamental to prove the existence, in marine facies, of all Jurassic stages, except the Kimmeridgian.
OtherDOI
Middle Bajocian ammonites from the Cook Inlet region, Alaska
TL;DR: Jurassic ammonites of late Bajocian age have been found in the Cook Inlet region, Alaska, along the west side of Cook inlet, and in the southeastern part of the Talkeetna Mountains.
Book ChapterDOI
Middle Jurassic ammonite evolution in the Andean province and emigration to tethys
TL;DR: The neuquen basin represents the southeastern embayment of the Jurassic marginal sea as mentioned in this paper, and includes mainly the Cuyan Sedimentary Cycle, with Pliensbachian-Upper Bajocian Lower Subcycle and Upper Bathonian-Middle Callovian Upper Subcycle.