Results 21 to 30 of about 3,015 (220)
Estudio bioestratigráfico (Ammonoidea) del Aaleniense y Bajociense en Asturias [PDF]
, 1979 Se ha reconocido un conjunto de parámetros tafonómicos que están íntimamente relacionados con las condiciones de depósito y con los procesos de diagénesis temprana.
Fernández López, Sixto Rafael +1 more
core +4 more sources
Extreme abundance of ammonoids in mass accumulations from the Late Devonian of the Moroccan Anti-Atlas [PDF]
Acta Palaeontologica Polonica, 2022 The eastern Anti-Atlas is renowned for its highly fossiliferous outcrops of Devonian rocks. Ammonoids occur in rock-forming numbers at many localities in the Tafilalt and Maïder.
MERLE GREIF +2 more
doaj +1 more source
Dimorphism in tetragonitid ammonoid Tetragonites minimus from the Upper Cretaceous in Hokkaido, Northern Japan [PDF]
Acta Palaeontologica Polonica, 2022 Mature modifications, ontogeny, and dimorphism of the small-sized tetragonitid ammonoid Tetragonites minimus were investigated in 43 specimens from the Santonian, Upper Cretaceous of the northwestern area of Hokkaido, Japan.
DAISUKE AIBA
doaj +1 more source
Origination, diversity, and extinction metrics essential for analysis of mass biotic crisis events: An example from cretaceous ammonoidea [PDF]
Traditional mass extinction research has predominently concentrated on statistically demonstrating that mass extinction intervals are significantly above background levels of familial and generic extinction in terms of extinction percentage, extinction ...
Collom, Christopher J.
core +2 more sources
Terr@ Plural, 2021 Although the fossil record from Antarctica is increasing continuously, there is still a great lack of knowledge regarding the past biodiversity of this continent. Here we present the first occurrences of the ammonoid Pseudophyllites? cf.
Roberto Videira-Santos +2 more
doaj +1 more source
Papers in Palaeontology, Volume 7, Issue 3, Page 1435-1457, August 2021., 2021 Abstract The ammonoid genus Arctoceras (Hyatt) occurs across all palaeolatitudes, and is a key genus for middle Smithian biostratigraphical correlations globally. In this study, intraspecific variations in conch morphology, ornamentation and allometry are examined in relation to stratigraphic position.
Bitten B. Hansen +4 more
wiley +1 more source
Recent advances in heteromorph ammonoid palaeobiology
Biological Reviews, Volume 96, Issue 2, Page 576-610, April 2021., 2021 ABSTRACT Heteromorphs are ammonoids forming a conch with detached whorls (open coiling) or non‐planispiral coiling. Such aberrant forms appeared convergently four times within this extinct group of cephalopods. Since Wiedmann's seminal paper in this journal, the palaeobiology of heteromorphs has advanced substantially.
René Hoffmann +9 more
wiley +1 more source
Early Cretaceous ammonites and dinoflagellates from the Western Tatra Mountains, Poland [PDF]
Acta Palaeontologica Polonica, 2020 The first Early Cretaceous (Valanginian–Hauterivian) ammonite fauna from the lower part of the Kościeliska Marl Formation (Wściekły Żleb Member) of the Lower Sub-Tatric (Krížna) Nappe, in the Lejowa Valley of the Tatra Mountains are described.
Zdeněk Vašíček +6 more
doaj +1 more source
Acta Palaeontologica Polonica, 2023 Fossils of Devonian ammonoids are abundant and well-preserved in the Anti-Atlas of Morocco; as such they provide an invaluable record of regional morphological disparity changes (diversity of shapes) that characterise the first steps of ammonoid ...
NINON ALLAIRE +6 more
doaj +1 more source
Lower Cretaceous (Hauterivian-Albian) ammonite biostratigraphy in the Maestrat Basin (E Spain) [PDF]
, 2014 Peer reviewedPublisher ...
Bover-Arnal, T. +11 more
core +4 more sources