Results 31 to 40 of about 13,318 (257)
The Albian-Cenomanian boudary in the northern part of the Don-Medveditsa dislocations. Paper 2. Oryctocoenoses analysis. Conclusions [PDF]
Известия Саратовского университета. Новая серия: Серия Науки о ЗемлеAmmonite finds at the Miroshniki site, within the Albian-Cenomanian boundary interval, make it possible to identify the presence of the analogues of the Upper Albian zones Mortoniceras fallax (autochthonous burial within aleurolites) and Mortoniceras ...
Pervushov, Evgeniy Mikhaylovich +3 more
doaj +1 more source
Estudios Geologicos, 2020 En el sureste de la Cordillera Ibérica (España) existen una serie de afloramientos de rocas volcánicas originadas por erupciones submarinas, principalmente de tipo volcanoclástico, interestratificadas en las sucesiones carbonatadas del Jurásico Inferior
J. E. Cortés
doaj +1 more source
, 2016 Twelve specimens of Aptian ammonites reported and drawn by Burckhardt in 1906, from the Mazapil area (Zacatecas State, north-central Mexico), are reviewed for taxonomical purposes. The work by Burckhardt was the first report of Aptian ammonoids in Mexico.
R. Barragán +2 more
semanticscholar +1 more source
Ichnology of the Rhätsandstein in the Exter Formation (Triassic), Germany
Geological Journal, EarlyView.Trace fossils from the Rhätsandstein of southern Germany record repeated colonization of high‐energy shallow‐marine substrates before the Triassic–Jurassic transition. The assemblage reflects environmental and preservational controls on ichnodiversity.
Daniel Sedorko, James H. Nebelsick
wiley +1 more source
Sedimentology, EarlyView.ABSTRACT Although the global expansion of oxygen‐depleted marine environments during the Early Toarcian Jenkyns Event (or Toarcian Oceanic Anoxic Event) is primarily inferred from successions in the NW European epicontinental basins, the timing of the expansion of anoxia in Tethyan basins, where hydrography potentially played a minor role, is poorly ...
Tamás Müller +6 more
wiley +1 more source
The Cretaceous ammonite Ammonites requienianus d'Orbigny, 1841
, 1984 (Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Kennedy, W. J. (William James) +1 more
openaire +2 more sources
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
The Ammonites Were Not Pacifists [PDF]
, 2016 Although it is common to believe that the Ammonites were pacifists, the report of their story demonstrates that this is a mistake. Appreciating the Ammonites’ non-pacifism helps us think more clearly about them, and it also explains several features of ...
Boyce, Duane
core
Cretaceous ammonites from the Sultanate of Oman (Adam Foothills)
GeoArabia, 2015 Twenty taxa are described from the Cretaceous of Oman (Adam Foothills). The genera Puzosia, Placenticeras, Cunningtoniceras, Nigericeras, Metoicoceras, Rubroceras and Hoplitoides and the subgenus C.
C. Meister, A. Piuz
semanticscholar +1 more source
Sedimentology, EarlyView.ABSTRACT Classical models of formation of sedimentary siliceous rocks (flint, chert, opoka) commonly assume that the Cretaceous marine silicon (Si) cycle was primarily biologically controlled, broadly analogous to the modern ocean. In this framework, siliceous sponges are regarded as the principal source of dissolved silica (dSi) to sediment porewaters,
Agata Jurkowska +4 more
wiley +1 more source