Results 41 to 50 of about 14,034 (253)

Ammonite biostratigraphy on the platform–slope transition between the Vercors Urgonian platform and the Vocontian Trough (S–E France) [PDF]

Swiss Journal of Palaeontology
This study presents a high-resolution biostratigraphic analysis of a nearly 30 km long platform-to-slope transect on the southern margin of the Vercors Urgonian platform, based on detailed ammonite data.
Antoine Pictet, Serge Ferry, Lara Pietra
doaj   +3 more sources

Integrated stratigraphy of the Upper Hauterivian to Lower Barremian Agua de la Mula Member of the Agrio Formation, Neuquén Basin, Argentina [PDF]

, 2011
The Upper Hauterivian to Lower Barremian Agua de la Mula Member of the Agrio Formation (Neuquén Basin, Argentina) was studied applying an integrated stratigraphic approach and facies analysis.
Archuby, Fernando, Leanza, Hector Armando, Wilmsen, Markus   +2 more
core  

Ammonites and stratigraphy of a Lower Bajocian (Middle Jurassic) section in Sierra Chacaico (Neuquén Basin, Argentina) [PDF]

, 2012
A Lower Bajocian section from southern Neuquén Basin (Argentina), with 3 faunal horizons (sphaeroceroides, submicrostoma and giebeli horizons) in the Singularis and Giebeli zones, is described.
Dietze, Volker, Hillebrandt, Axel von, Riccardi, Alberto, Schweigert, Günter   +3 more
core   +2 more sources

LATE JURASSIC AND EARLY CRETACEOUS AMMONITES FROM THE WEIMEI FORMATION IN GYANGZE, SOUTHERN TIBET

Rivista Italiana di Paleontologia e Stratigrafia, 2004
The Weimei Formation in southern Tibet is a shallow marine sequence accumulated in the northern margin of the Indian subcontinent. It has been dated as Tithonian based on ammonites such as Haplophylloceras strigile (Blanford), Berriasella sp.
MASAHIKO TAKEI, ATSUSHI MATSUOKA, QUN YANG, KENTA KOBAYASHI, TOHRU NAGAHASHI, QINGGAO ZENG, YUJING WANG, GUOXIONG HE   +7 more
doaj   +1 more source

New biostratigraphical data (calcareous nannofossils, ammonites) and Early to Late Barremian transition in the Urgonien Jaune facies and Marnes de la Russille complex of the Swiss Jura Mountains

Swiss Journal of Palaeontology, 2020
In the central Jura Mountains (Western Switzerland), the Urgonien Jaune (UJ) facies with the Marnes de la Russille beds (MRu) have provided very rich nannofloras associated with very rare Tethyan ammonites.
Eric De Kaenel, Pierre-Olivier Mojon, Antoine Pictet   +2 more
doaj   +1 more source

The last ammonite? [PDF]

Bulletin of the Geological Society of Denmark, 1999
A fragment of red-brown flint with imprints of two ammonite aptychi has been found loose on the beach of the Boesdal quarry on Stevns Klint. The quarry exposes only Lower Danian bryozoan limestone. The nearest occurrence of Maastrichtian strata is 400 m to the west in Skeldervig bay, north of Korsnæb, where 50 cm of chalk with small dark-grey and black
Surlyk, Finn, Milàn, Jesper
openaire   +1 more source

Towards a standard ammonite zonation for the Aptian (Lower Cretaceous) of northern Mexico

Revista Mexicana de Ciencias Geológicas, 2018
Detailed data on twenty-seven species of ammonites identified in three stratigraphic sections of northern Mexico, allow further refinement of the Aptian ammonite biozonations of previous authors. Four formal ammonite biozones are proposed.
Ricardo Barragán-Manzo, Ana Laura Méndez-Franco   +1 more
doaj  

Reconstructing Environmental and Microbial Ecosystem Changes Across the Permian–Triassic Mass Extinction at Lusitaniadalen, Svalbard

Paleoceanography and Paleoclimatology, Volume 41, Issue 2, February 2026.
Abstract The Permian–Triassic environmental crisis triggered fundamental changes in marine ecosystems, culminating in the most severe biodiversity crisis of the Phanerozoic. Yet, the environmental and geochemical conditions governing the crisis and ecosystem recovery remain debated.
S. Z. Buchwald, A. B. Frank, D. Birgel, K. Senger, T. Mosociova, Y. Pei, B. Beaty, L. G. Tarhan, F. Galasso, M. A. Gómez Correa, S. E. Grasby, U. Struck, D. Yuan, R. Steinkrauss, J. Gliwa, N. Lahajnar, J. Peckmann, W. J. Foster   +17 more
wiley   +1 more source

IV.—Notes on Ammonites [PDF]

Geological Magazine, 1919
The variability and occasional instability of the Ammonoid suture-line, to which attention has been drawn, the recurrence of similar types, and the frequent asymmetry of the opposing halves of a given suture-line, which is apparent not only in the Dactylioceras commune, figured by Swinnerton & Trueman (fig. 9 on p.
openaire   +1 more source

Ichnological insights into deoxygenation across the Cenomanian–Turonian Boundary Oceanic Anoxic Event 2 in the northern extent of Western Interior Seaway (west‐central Alberta)

Sedimentology, Volume 73, Issue 2, Page 355-390, February 2026.
ABSTRACT In‐depth ichnological and sedimentological analyses of the Cenomanian–Turonian boundary Oceanic Anoxic Event (OAE2) from the Western Interior Seaway of west‐central Alberta reveal a persistent physico‐chemically stressed setting. The interval is characterised by a dominantly diminutive and diminished ichnological assemblage, with familiar ...
Sara K. Biddle, Murray K. Gingras
wiley   +1 more source