Results 61 to 70 of about 852 (169)

A thorny evolution: first Triassic ammonoid with a ventral apertural elongated rostrum

Papers in Palaeontology, Volume 12, Issue 4, July/August 2026.
Abstract Ornamented terminal peristomes are common in ammonoids, but pronounced conch projections are rare, particularly in the Triassic. A new early Spathian assemblage from southeastern Idaho yielded two ammonoid specimens with an impressive terminal mid‐ventral elongated rostrum, documenting the first Triassic occurrence and one of the few ...
Arnaud Brayard, Emmanuel Fara, Nicolas Olivier, James F. Jenks, Kevin G. Bylund, Daniel A. Stephen, Noreen Kittrick, Emilie Steimetz, Gilles Escarguel   +8 more
wiley   +1 more source

Cambrian small shelly fossils from North Greenland (eastern Laurentia; Series 2, Stage 4) with regional and global correlations

Papers in Palaeontology, Volume 12, Issue 4, July/August 2026.
Abstract Cambrian Series 2 represents a key interval for documenting the evolution and diversification of early biomineralized skeletal animals. In this interval, small shelly fossils (SSF) provide an essential archive for regional biostratigraphy and intercontinental correlation.
Yeongju Oh, Tae‐Yoon S. Park, John S. Peel   +2 more
wiley   +1 more source

First discovery of a barnacle (Balanus crenatus) on the critically endangered flapper skate (Dipturus intermedius)

Ecology, Volume 107, Issue 10, October 2026.
Adnan Shahdadi, Danielle L. Orrell, Alfonso Cohuo, Min‐Hsien Lee, Benny K. K. Chan   +4 more
wiley   +1 more source

Emplacement of Hybrid Continental‐Oceanic Arc Terranes Without Collision: The Devonian Calliope Arc (New England Orogen, Australia)

Tectonics, Volume 45, Issue 7, July 2026.
Abstract The accretion of allochthonous provinces, derived from oceanic plates, has traditionally been considered an important contributor to continental growth. However, increasing evidence shows that some oceanic terranes (e.g., island arcs) are not “exotic,” as suggested by the presence of continental‐derived sedimentary provenance.
Igor V. Gomes, Gideon Rosenbaum, Carlos A. Spier, Jack F. Ward, Luke A. Milan   +4 more
wiley   +1 more source

Confirmation of the impact origin of the Late Ordovician Tvären impact structure (southeast Sweden) and emplacement of impactites in a marine setting

Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1188-1212, July 2026.
Abstract The Tvären structure in southeastern Sweden has been listed as a confirmed marine‐target impact structure for decades. However, to date, no measurements and/or indexed data of planar deformation features in quartz grains from the structure have been published or any other unequivocal evidence of impact.
Katarzyna J. Gajewska, Sanna Alwmark, Mikael Calner, Sylvain Richoz, Jens Ormö, Erik Sturkell, Carl Alwmark   +6 more
wiley   +1 more source

Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure

Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1213-1242, July 2026.
Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark, J. Granbom, P. Ahlberg, M. Calner, S. Richoz, K. J. Gajewska, W. R. Hyde, K. Ljung, C. Alwmark   +8 more
wiley   +1 more source

Putative Analogs of Pyrite Suns Forming in Proglacial Alaska Mudflats

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 5, May 2026.
Abstract Disc‐shaped pyrite suns of the Pennsylvanian age Anna Shale are thought to have formed where pressure restricted pyrite crystal growth to a flattened disc shape during diagenesis at the Anna Shale and the underlying Herrin coal boundary.
Heather L. Fair, Trinity L. Hamilton, Jeff R. Havig   +2 more
wiley   +1 more source

CAMBRIAN CONODONTS ACROSS THE PRE-FURONGIAN TO FURONGIAN INTERVAL IN THE GSSP SECTION AT PAIBI, HUNAN, SOUTH CHINA

Rivista Italiana di Paleontologia e Stratigrafia, 2006
The conterminant base of the Furongian Series and Paibian Stage (Cambrian), as ratified in 2003, is in dark carbonate slope deposits of the Paibi section, Hunan, China, at the FAD of the agnostid trilobite Glyptagnostus reticulatus.
QI YU-PING, GABRIELLA BAGNOLI, WANG ZHI-HAO   +2 more
doaj   +1 more source

Ontogeny of the ptychopariid trilobite Kaotaia globosa from the Cambrian Kaili Biota of eastern Guizhou, China [PDF]

Swiss Journal of Palaeontology
The exceptional fossil record of trilobite ontogeny allows the elucidation of the developmental evolution of early arthropods. However, the paucity of detailed segmental growth data limits the understanding of growth dynamics during post-embryonic ...
Shengguang Chen, Dezhi Wang, Zhixin Sun, Zhengpeng Chen, Xinglian Yang, Fangchen Zhao   +5 more
doaj   +3 more sources

Vibrationally highly excited trilobite molecules stabilized by nonadiabatic coupling

Physical Review Research
We report on the observation of highly excited (ν∼100) vibrational states of a trilobite ultralong-range Rydberg molecule in ^{87}Rb. These states manifest spectroscopically in a regularly spaced series of peaks red-detuned from the 25f_{7/2 ...
Rohan Srikumar, Markus Exner, Richard Blättner, Peter Schmelcher, Matthew T. Eiles, Herwig Ott   +5 more
doaj   +1 more source