Results 71 to 80 of about 11,709 (248)
Evolution in Upper Jurassic Ammonites [PDF]
Evolution, 1959 Evolution in ammonites has been known for nearly a century. It was mainly under the influence of Charles Darwin (1859) that paleontologists began to look for successions of similar species and to connect these species into lineages. These early studies of evolution in ammonites are due to, e.g., Waagen (1869), Neumayr (1873) and Gemmellaro (1872-82 ...
openaire +2 more sources
Технічна інженерія, 2019 A device for the preparation of a water-filled foamed explosive composition is proposed, which can be used in field conditions for compacting subsidence of unstable soils.
V.V. Boiko +3 more
doaj +1 more source
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
Examples of reelaborated ammonites [PDF]
, 2011 Identify reelaborated fossils requires knowing the meaning of the term taphonomic reelaboration and the diagnostic criteria that can be used to test such preservation state. In the present work: 1) we make explicit the meaning of the taphonomic terms: accumulation, remotion or reworking, resedimentation and reelaboration, understood as diverse ...
openaire +1 more source
Rivista Italiana di Paleontologia e Stratigrafia, 2017 In this paper a new methodology for the morphometric analysis of the Ammonite shell is proposed. It is based on the measurements of ventral and umbilical radii, of section width and rib number.
ALBERTO FERRETTI
doaj +1 more source
Uppermost Albian biostratigraphy and chronostratigraphy
Carnets de Géologie, 2009 The Albian Stage is the highest chronostratigraphic unit of the Lower Cretaceous Series and underlies the Cenomanian Stage of the Upper Cretaceous Series.
Scott Robert W.
doaj
Extended and adjustable field-of-view of variable interscan time analysis by ammonite-scanning swept-source optical coherence tomography angiography. [PDF]
Biomed Opt Express, 2023 Mino T +11 more
europepmc +1 more source
, 2012 The present paper focuses on the evolutionary dynamics of ammonites from sections along the Russian Pacific coast during the mid-and Late Cretaceous. Changes in ammonite diversity (i.e., disappearance [extinction or emigration], appearance [origination ...
E. Jagt-Yazykova
semanticscholar +1 more source
Carnets de Géologie, 2006 One of the significant results of the multidisciplinary investigations carried out during recent years in the Lower Aptian historical stratotype of the Cassis-La Bédoule region (South-Eastern France) was a proposal to update the local Upper Barremian ...
Ropolo Pierre +4 more
doaj