New late Smithian (Early Triassic) ammonoids from the Lusitandiadalan Member, Vikinghøgda Formation, Svalbard

Abstract

A single carbonate concretion from the uppermost Lusitaniadalen Member ('Fish Niveau', Vikinghøgda Formation)

Revision of the genus Anasibirites Mojsisovics (Ammonoidea): an iconic and cosmopolitan taxon of the late Smithian (Early Triassic) extinction

“…) Cosmopolitan species found in Nevada, Utah and Idaho (e.g. Mathews ; Smith ), Siberia (Dagys and Ermakova ), Spitsbergen (Weitschat and Lehmann ; Piazza ), British Columbia (Tozer ), Timor (Welter ; this work), Spiti (Brühwiler et al . ), Salt Range (Waagen ; Brühwiler et al .…”

The history of exploration and stratigraphy of the Early to Middle Triassic vertebrate-bearing strata of Svalbard (Sassendalen Group, Spitsbergen)

“…The biostratigraphy of the Vikinghøgda Formation has been defined by ammonoids, conodonts and palynology, with the ammonoid stratigraphy of W. Weitschat providing crucial age control (Weitschat & Lehmann, 1978;Weitschat & Dagys, 1989;Dagys & Weitschat, 1993;Mørk et al, 1999b). Tozer (1994), Dagys & Sobolev (1995) and Piazza et al (2017) continued this work and Hounslow et al (2008a) linked the magnetostratigraphy of the Vikinghøgda Formation to the ammonoid biostratigraphy. The palynological composite assemblage zones were defined by Mørk et al (1999b) and Vigran et al (2014).…”

New middle and late Smithian ammonoid faunas from the Utah/Arizona border: New evidence for calibrating Early Triassic transgressive-regressive trends and paleobiogeographical signals in the western USA basin

“…Spath (1934) erected three additional prionitid taxa from Spitsbergen, i.e., Gurleyites freboldi, Hemiprionites gardwoodi and Arctoprionites tyrrelli, which are very close to A. nodosus and actually are probably variants of this species. In terms of whorl shape and coiling geometry, these four taxa are practically indistinguishable from Gurleyites smithi (compare our Supplementary Material Piazza, 2015), the only difference being slight but apparently consistent differences in ornamentation (e.g., shape and trajectory of ribs, and nodes on the flanks of A. nodosus appear to be placed farther toward the venter than on Gurleyites smithi). These ornamental variances can justify a separate species, but probably not a separate genus.…”

“…Gurleyites smithi shows a rather large geographic distribution as do most early late Smithian prionitid genera, (e.g., Spitsbergen : Frebold, 1930, Piazza et al, 2017British Columbia: Tozer, 1994;Timor: Jattiot et al, 2020). It is found at several places in the eastern and southern parts of the western USA basin, but is often rare (Brayard et al, 2013;Jattiot et al, 2017;Jenks and Brayard, 2018).…”