Results 31 to 40 of about 814 (192)

Conellae, enigmatic structures on cephalopod shells—shapes, distribution, and formation [PDF]

Acta Palaeontologica Polonica, 2019
Conellae, enigmatic cone-shaped structures which can be found on the surface of internal moulds of cephalopod shells (predominantly of ammonoids), are regarded herein as the product of remote (biologically induced) biomineralization formed in closed-off ...
René Hoffmann, Aleksandr Mironenko, Helmut Keupp   +2 more
doaj   +1 more source

Morphological variations and geographic distribution of the rare Middle Jurassic ammonite Oecoptychius refractus

Acta Palaeontologica Polonica, 2023
The rare Middle Jurassic ammonite Oecoptychius refractus is revisited based on material collected in southern Poland (Ogrodzieniec quarry) and France (St.-Laon near Loudun, western France). Based on available data and an evaluation of the literature, O.
SREEPAT JAIN, MARIUSZ A. SALAMON, GÜNTER SCHWEIGERT, BARTOSZ J. PŁACHNO   +3 more
doaj   +1 more source

MIDDLE TRIASSIC (ANISIAN) CEPHALOPODS FROM THE MECSEK MOUNTAINS, HUNGARY

Rivista Italiana di Paleontologia e Stratigrafia, 2022
Recent nautiloid and ammonoid finds from the Middle Triassic Zuhánya Limestone Formation in the Mecsek Mountains (south Hungary) proved that the formation encompasses the whole Pelsonian and the lower Illyrian substages of the Anisian Stage.
ATTILA VÖRÖS, GYULA KONRÁD, Krisztina Sebe   +2 more
doaj   +2 more sources

Lower and Middle Cenomanian ammonites from the Morondava Basin, Madagascar [PDF]

, 2013
Lower and Middle Cenomanian ammonite assemblages have been collected on a bed-by-bed basis from localities at Vohipaly and Mahaboboka, Madagascar, as well as from outcrops around Berekata, all in the Morondava Basin, southwest Madagascar.
Walaszczyk, I., Kennedy, William James, Gale, Andy, Dembicz, K., Praszkier, Tomasz, Dembicz, Krzysztof, Gale, A. S., Kennedy, W. J., Walaszczyk, Ireneusz, Praszkier, T.   +9 more
core   +1 more source

Fig. 22 in The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

, 2022
Fig. 22. Acanthoclymenia planorbis (Sandberger & Sandberger, 1851). A. Specimen MB.C.30438 (Koch Coll.) from Oberscheld. B. Specimen MB.C.30439 (Kauth Coll.) from Oberscheld (Königszug Mine).
Korn, Dieter, Bockwinkel, Jürgen
core   +1 more source

Síntesis bioestratigráfica del Calloviense de Ricla (Zaragoza. Cordillera Ibérica)

Estudios Geologicos, 1984
Se presenta en esta nota un avance de esquema bioestratigráfico para el Calloviense de Riela (Zaragoza) sobreuna muestra de 567 ammonoideos a lo largo de un perfil de 70 metros.
E. Sequeiros, E. Cariou
doaj   +1 more source

El Lias Superior y el Dogger inferior en Gorgo a Cerbara (Apenino Central): Aspectos bioestratigráficos y sedimentológicos

Estudios Geologicos, 1987
En un punto cercano a la localidad de Gorgo a Cerbara (Apenino Umbro-Marchigiano, Italia) se ha efectuado el levantamiento de una columna estratigráfica correspondiente al intervalo.
O. Kälin, S. Ureta
doaj   +1 more source

Revision of haploceratid ammonoids from the Štramberk Limestone, Jurassic–Cretaceous boundary beds (Outer Western Carpathians) [PDF]

Acta Palaeontologica Polonica
Haploceratids from the Štramberk Limestones represent three genera Haploceras, Hypolissoceras, and Volanites. The most species reach genus is Haploceras.
Zdeněk Vašíček, Petr Skupien
doaj   +1 more source

DISCOVERY OF AMMONOID JAW APPARATUS AND ASSOCIATED FEATURES USING REFLECTANCE TRANSFORMATION IMAGING (RTI)

Publicación Electrónica de la Asociación Paleontológica Argentina, 2023
We report on remains of the buccal apparatus and possible associated structures for the Late Cretaceous ammonite Maorites seymourianus from the López de Bertodano Formation (Antarctic Peninsula).
Daniel Andrés Morón-Alfonso, Marcela Cichowolski, René Hoffmann, Maricel Gabriela Rodríguez   +3 more
doaj   +1 more source

Linked collectors and determiners for: The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea).

Natural history specimen data linked to collectors and determiners held within, "The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)". Claims or attributions were made on Bionomia by volunteer Scribes, <
Bionomia
core   +4 more sources