Geologica Carpathica, 2017 Euthymi, Crassicostatum and Callisto ammonite subzones, correlable with Paramimounum, Picteti, and Alpillensis subzones and probably with the Late Berriasian Otopeta Subzone of the Boissieri Standard Zone have been recognized in calcareous clays of the ...
Arkadiev Vladimir V. +6 more
doaj +1 more source
Geological Magazine, 1920 It is well known that the chambers of Cephalopod shells are connected by an organ called the siphuncle, which passes through the septa by the septal necks. Many investigators who have studied these shells have made careful observations on the siphuncle, hoping thereby to throw light on its functions.
openaire +2 more sources
Carnets de Géologie, 2007 Généralement considéré comme une période chaude, le Crétacé supérieur témoigne d'une extension maximale des domaines marins. Les optima transgressifs du Cénomanien et du Turonien inférieur induisent la création de nouveaux domaines de mer épicontinentale
Courville Philippe
doaj
About the stratigraphic position of the Lower Aptian Roloboceras hambrovi (Ammonoidea) level
Carnets de Géologie, 2008 In the stratotype of the Lower Aptian substage the position of the assemblage that includes Roloboceras spp. and Megatyloceras spp. has been clearly established as being in the middle part of the upper Bedoulian. Some authors have erected this horizon as
Conte Gabriel +3 more
doaj
The History of the Aptian Stage Stratigraphy and Ammonoids of the Central Part of the Northern Caucasus Studies. Paper 1. 19th Century to 1969 [PDF]
Известия Саратовского университета. Новая серия: Серия Науки о ЗемлеThe offering paper covers the history of the Aptian stage stratigraphy and ammonites studies of the central part of the Northern Caucasus, which was subdivided by the author into five stages. The first (mid-to-late 19th century), second (1901–1951)
Polkovoi, Kirill Sergeevich
doaj +1 more source
Carnets de Géologie, 2010 The study of more than 40 sections in the "Creniceras renggeri marls" of the French Jura Range (Lower Oxfordian) has found: * a precise biochronostratigraphic subdivison of 16 successive populations or associations which appears to be stable over the ...
Jardat Rémi
doaj
OCCURRENCE OF LIASSIC FAUNAS AT WAANEY (UANEI) PROVINCE OF BAY, SOUTH—WESTERN SOMALIA
Rivista Italiana di Paleontologia e Stratigrafia, 2020 The sequence exposed at Waaney (South—western Somalia) consists, from bottom to top, of the following horizons: A) Blackish marly limestones, thickness 20 m; B) Grey and greenish marls and shales, thickness 10 m; C) Vacuolar yellowish—grey limestone ...
PAOLO CANUTI +3 more
doaj
Petroleum geology of the Upper Jurassic – Lower Cretaceous of East and North-East Greenland: Blokelv-1 borehole, Jameson Land Basin: Biostratigraphy of the Hareelv Formation (Upper Jurassic) in the Blokelv-1 core, Jameson Land, central East Greenland [PDF]
Geological Survey of Denmark and Greenland Bulletin, 2018 The Hareelv Formation in the Blokelv-1 core is biostratigraphically subdivided by means of ammonite and dinoflagellate cyst stratigraphy. The succession ranges from the Oxfordian C. densiplicatum Chronozone to the Volgian P. elegans Chronozone.
Peter Alsen, Stefan Piasecki
doaj
A new index for quantifying the ornamentational complexity of animals with shells. [PDF]
Ecol Evol, 2022 Miao L +4 more
europepmc +1 more source
The Jurassic of North-East Greenland: Maximum Middle Jurassic transgression in East Greenland: evidence from new ammonite finds, Bjørnedal, Traill Ø [PDF]
Geological Survey of Denmark and Greenland Bulletin, 2004 A Middle – lower Upper Jurassic sandstone-dominated succession, more than 550 m thick, with mudstone intercalations in the middle part is exposed in Bjørnedal on Traill Ø, North-East Greenland.
Alsen, Peter, Surlyk, Finn
doaj