Results 41 to 50 of about 809 (126)

Metacryphaeus rotundatus, um Novo Elemento da Fauna de Trilobites Calmoniidae (Phacopida), da Formação Ponta Grossa (Devoniano), Bacia do Paraná, Brasil [PDF]

Geologia USP. Série Científica, 2008
Trilobites Calmoniidae (Delo, 1935) constituem o grupo de Phacopida mais abundante e diversificado do registro fóssilda Formação Ponta Grossa, Devoniano, Sub-bacia Apucarana.
Sabrina Pereira Soares, Marcello Guimarães Simões, Juliana de Moraes Leme   +2 more
doaj   +3 more sources

Raman Line Scan Analyses and a New Hypothesis for the Formation of Anatase‐Hosting Microbialites: Study of the Stromatolites From Saint‐Jean‐de‐la‐Rivière, Cotentin, France

Journal of Raman Spectroscopy, Volume 57, Issue 8, Page 1463-1480, August 2026.
Micrometer analysis of millimeter lines of Raman spectra concludes in the association of anatase and graphitized organic matter (graphogen). The photosynthetic microorganisms at the origin of the microbialites produce O2, which is transformed by TiO2 into reactive species that, in turn, decompose the organic matter of the microorganisms. ABSTRACT Raman
Marie‐Paule Bassez
wiley   +1 more source

Micropollutants and the Restructuring of Microbial Resilience in the Anthropocene

Global Change Biology, Volume 32, Issue 8, August 2026.
Conceptual framework linking anthropogenic chemical complexity to the restructuring of microbial resilience in the Anthropocene. Persistent, low‐dose chemical mixtures can reorganize microbial coordination networks, regulatory and metabolic processes, and ecological memory, thereby altering functional redundancy, adaptive capacity, and disturbance ...
Despo Fatta‐Kassinos, Andrea Naziri, Celia Manaia, Luis Pedro Coelho   +3 more
wiley   +1 more source

Paleomagnetic Constraints on the Separation of the Olongbuluke Block From the North China Block During the Late Cambrian–Middle Ordovician and Its Tectonic Significance

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract The collisional evolution of the micro‐blocks in the northeastern Tibetan Plateau is relatively well constrained. However, the reason why a fragment of the North China Block, the Olongbuluke Block, became separated from North China by the Central Qilian Block (a fragment of the South China Block) remains unclear.
Teng Wang, Yanan Zhou, Ruiyang Chai, Xin Cheng, Hanning Wu   +4 more
wiley   +1 more source

New data on the Lower Cambrian trilobites of Cortijos de Malagon (Spain)

Estudios Geologicos, 1989
En este trabajo se describe la fauna de trilobites del Cámbrico inferior de las areniscas de los Cortijos de Malagón en el SE español. Comprende Realaspis (?) sp., Kingaspis (?) sp.; cf. Latoucheia sp. y Lusatiops afI. ribotanus. Richter y Richter, 1948.
Mª D. Gil Cid, J. B. Jago
doaj   +1 more source

Upper lower Cambrian (provisional Cambrian Series 2) trilobites from northwestern Gansu Province, China [PDF]

Estonian Journal of Earth Sciences, 2014
Upper lower Cambrian (provisional Cambrian Series 2) trilobites are described from three sections through the Shuangyingshan Formation in the Beishan area, northwestern Gansu Province, China. The trilobite fauna is dominated by eodiscoid and corynexochid
Jan Bergström†, Zhou Zhiqiang, Per Ahlberg, Niklas Axheimer   +3 more
doaj   +1 more source

Evidence of Cheliped Autotomy and Regeneration in the Lower Miocene Crab Achelous monspeliensis From Portugal

Ecology and Evolution, Volume 16, Issue 7, July 2026.
Crab autotomy with evidence of regeneration is described for the first time in the fossil record. Autotomy is a defensive behavior that affects more males than females of Achelous monspeliensis and may be related to mating season. ABSTRACT Autotomy—the voluntary shedding of a limb as a defensive response to predation, intraspecific aggression, or ...
Carlos Neto de Carvalho, Pedro Marrecas
wiley   +1 more source

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

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