Results 31 to 40 of about 2,661 (202)

Ontogeny and variability in ribbing of Late Valanginian lamellaptychi (Ammonitina)

Annales Societatis Geologorum Poloniae, 2016
Late Valanginian (Early Cretaceous) lamellaptychi of the genus Mortilletilamellaptychus were collected from seven ammonite-controlled sections in south-eastern France demonstrate distinct changes in ribbing during growth. Simpler juvenile ribbing, which is essentially uniform for all of the specimens studied, differs distinctly from the complicated ...
Vašíček, Z. (Zdeněk), Klein, J., Janssen, N. M. M.   +2 more
openaire   +3 more sources

(Appendix 2) Redox-sensitive trace-element contents in the Valanginian samples for the studied sections

, 2010
(Appendix 2) Redox-sensitive trace-element contents in the Valanginian samples for the studied ...
Westermann, Stéphane, Fiet, Nicolas, Föllmi, Karl B, Fleitmann, Dominik, Matera, Virginie, Johann Schnyder (3199125), Stéphane Westermann (6963203), Dominik Fleitmann (7491773), Nicolas Fiet (6963224), Adatte, Thierry, Thierry Adatte (6963212), Duchamp-Alponse, Stéphanie, Stéphanie Duchamp-Alponse (6963236), Schnyder, Johann, Ploch, Izabela, Karl B Föllmi (6963209), Izabela Ploch (6963233), Virginie Matera (6963215)   +17 more
core   +1 more source

Proposals for the stratigraphic positions of the Berriasian - Valanginian and the Valanginian Hauterivian boundaries

Bulletin of the Geological Society of Denmark, 1984
In two previous papers (Hoedemaeker, 1982, 1983) the author proposed to draw the boundary between the Berriasian and the Valanginian at the base of the TimoveUa alpiUensis Subzone, which he described from SE Spain. The correlation of this subzone with the published French zonation is however problema­tic, because the fauna) association of the ...
openaire   +1 more source

A new coral family and three new genera from the Lower Cretaceous of Puebla and Sonora (Scleractinia; Mexico)

Revista Mexicana de Ciencias Geológicas, 2022
Solitary corals currently assigned to the genus Plesiosmilia are common elements in Late Jurassic to Early Cretaceous coral faunas. The genus itself is poorly defined and its systematic position is questionable.
Hannes Löser
doaj   +1 more source

The Earliest Feathers from the Lower Cretaceous Dabeigou Formation of North Hebei: Implications for the Early Evolution of the Jehol Biota

Integrative Zoology, EarlyView.
This study reports two isolated feather fossils from the Lower Cretaceous Dabeigou Formation in northeastern China. Morphological analyses identified them as the earliest known feathered theropods (potentially including avian) in the Jehol Biota. This finding reveals a complex ecosystem at the dawn of the Jehol Biota, bridging the temporal and faunal ...
Qian Wu, Qian‐Nan Zhang, Dang‐Peng Xi   +2 more
wiley   +1 more source

Valanginian to Barremian Benthic Foraminifera from ODP Site 766 (Leg 123, Indian Ocean) [PDF]

, 1995
A Valanginian to Barremian bathyal foraminiferal assemblage (118 taxa belonging to 51 genera) is documented from ODP Site 766, drilled near the foot of the Exmouth Plateau off northwest Australia.
Holbourn, A.E.L., Kaminski, M.A.
core  

Valanginian belemnites: New taxonomical and stratigraphical observations [PDF]

Carnets de géologie (Notebooks on geology), 2018
Six new Valanginian belemnite species (Duvalia crassa sp. nov., Duvalia elongata sp. nov., Duvalia kleini sp. nov., Duvalia superconstricta sp. nov., Castellanibelus vaubellensis sp. nov., and "Hibolithes" lebresensis sp. nov.) are described here and two species (Duvalia aff. elongata and "Hibolithes" aff. pistilliformis (BLAINVILLE, 1827)) are left in
openaire   +1 more source

Paleoenvironments of Berriasian–lower Hauterivian deposits in the Western Neotethys: Late development, demise and drowning of the Slivnitsa carbonate platform (Western Bulgaria)

Evolving Earth
Sedimentological and biostratigraphic results are used to interpret the Early Cretaceous history of the newly named Slivnitsa carbonate platform which existed on the northern Neotethyan margin.
Athanas Chatalov, Daria Ivanova
doaj   +1 more source

Processes and Patterns of Dolomite Precipitation in Aptian Pre‐Salt Deposits of Santos Basin, Brazil

Journal of Petroleum Geology, EarlyView.
ABSTRACT The Aptian pre‐salt lacustrine carbonates represent the most significant oil exploration target along the South Atlantic margin. Dolomitization of the Santos Basin Barra Velha Formation (BVF) is critical for reservoir quality, yet its origin, patterns, and evolution remain poorly understood.
J. T. F. Oste, R. Fricks Sayão, L. F. De Ros, L. Borghi   +3 more
wiley   +1 more source

A lower Valanginian coral fauna from the South Iberian Palaeomargin (Internal Prebetic, SE Spain) [PDF]

, 2021
From the Lower Valanginian of the Sierra de Cazorla (Internal Prebetic, SE Spain), a coral fauna is taxonomically described. The fauna encompasses 51 species in 29 genera. One genus and three species are described as new.
Lösser, H., Nieto, L.M., Reolid, M., Castro, J.M., Luis M. Nieto, Matías Reolid, José Manuel Castro, Hannes Löser   +7 more
core   +1 more source