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The Guryul Ravine section (Kashmir, India) exposes one the world's most continuous carbonate rock successions throughout the Permian-Triassic boundary and beyond. Due to political instability in this region, the biostratigraphy of this section has not been updated for nearly three decades. Following new high-resolution sampling, we reassess here the conodont biochronology and isotopic records of the...
The First Appearance Datum (FAD) of the conodont Chiosella timorensis has been recently proposed as an index for the worldwide recognition of the Olenekian-Anisian Boundary (OAB, Early-Middle Triassic boundary). We here report the co-occurrence of C. timorensis with the ammonoids Neopopanoceras haugi (Hyatt and Smith), Keyserlingites pacificus (Hyatt and Smith), Subhungarites yatesi (Hyatt and Smith)...
A single carbonate coquinoid lens from the Griesbachian (Early Triassic) of Shanggan, South China, yielded 11 bivalve species described in this study in addition to four gastropod and one ammonoid species reported elsewhere. This makes the Shanggan fauna one of the richest mollusc faunas from the early post-extinction interval after the end-Permian mass extinction event. Four of the present genera...
Intensive sampling of the Tulong Formation in South Tibet has facilitated the construction of a highly-resolved middle and late Smithian ammonoid succession. The new biostratigraphical sequence comprises the middle Smithian Brayardites compressus beds, Nammalites pilatoides beds, and the Nyalamites angustecostatus beds followed by the late Smithian Wasatchites distractus beds and Glyptophiceras sinuatum...
The aim of this paper is to quantitatively investigate the spatial and temporal biogeographical relationships of the recovery of ammonoid faunas after the Permian-Triassic mass extinction using three complementary numerical approaches among which is a new, non-hierarchical clustering strategy. The faunal data set consists of a taxonomically homogenised compilation of the spatial and temporal occurrences...
The Guadalupian Khuff Formation of the Huqf area (Sultanate of Oman) is composed of marine marls and bioclastic limestones which yield a rich brachiopod fauna associated with conodonts, foraminifers, ostracods, bivalves, gastropods, and cephalopods. The brachiopod fauna of the Khuff Fm. includes Perigeyerella raffaellae nov. sp., Derbyia sp. cf. D. diversa Reed, 1944, Neochonetes (Sommeriella) arabicus...
Ammonoid ribs, tubercles, keels and other ornamental features are organized in a great diversity of patterns. From the viewpoint of developmental biology, these patterns can only be understood as the product of a dynamical system controlled by genes but also dependent upon biochemical and mechanical processes. Here, an attempt is made to view the development of ammonoid ornamentation in the light...
Les processus de construction et les relations entre temps et distribution spatiale des structures périodiquesdu tube coquillier des ammonites et des gastéropodes (stries, lirae, côtes, constrictions, varices et mégastries) conduisent à concevoir la croissance accrétionnaire des formes enroulées comme étant soumise à des contraintes géométriques communes aux deux clades. La géométrie des incréments...
The Lower Permian succession of the Huqf area (Sultanate of Oman) represents the uppermost part of a mega-sequence which includes the Late Carboniferous to? Sakmarian tillites of the Al Khlata Fm. and the overlying transgressive marine Saiwan Fm. of Early Permian age. The Saiwan yields a rich brachiopod fauna associated with bivalves, gastropods, crinoids, conularids, cephalopods and bryozoans. The...
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