Results 1 to 10 of about 308 (178)

Monopodial and Sympodial Growth Modes in the Colonial Graptolithina (Hemichordata, Pterobranchia). [PDF]

Evol Dev
ABSTRACT Two growth modes are recognized in colonial pterobranchs (Graptolithina): monopodial growth and sympodial growth. The earliest colonial Graptolithina likely developed through monopodial growth, a mode of colony formation well‐documented in the extant graptolite Rhabdopleura normani.
Maletz J, Lerosey-Aubril R.
europepmc   +2 more sources

Automated graptolite identification at high taxonomic resolution using residual networks [PDF]

iScience
Summary: Graptolites, fossils significant for evolutionary studies and shale gas exploration, are traditionally identified visually by taxonomists due to their intricate morphologies and preservation challenges.
Zhi-Bin Niu, Si-Yuan Jia, Hong-He Xu
doaj   +2 more sources

Rhabdopleurid epibionts from the Ordovician Fezouata Shale biota and the longevity of cross-phylum interactions [PDF]

Communications Biology, 2023
Evidence of interspecific interactions in the fossil record is rare but offers valuable insights into ancient ecologies. Exceptional fossiliferous sites can preserve complex ecological interactions involving non-biomineralized organisms, but most of ...
Karma Nanglu, Madeleine E. Waskom, Jared C. Richards, Javier Ortega-Hernández   +3 more
doaj   +2 more sources

The southwesternmost record of late Silurian (Pridolian) early land plants of Gondwana [PDF]

Scientific Reports
The Silurian–Devonian transition played a crucial role in the development of early terrestrial ecosystems due to the rapid diversification of early vascular plants.
Juan M. Drovandi, Osvaldo A. Conde, Fernando E. Lopez, Eliana P. Coturel, Carlos M. Alarcón Gómez, Jonatan A. Arnol, Cintia Kaufmann, Alejandro R. Braeckman, Fernando A. Pedernera, Ulises Abarca   +9 more
doaj   +2 more sources

The fossil vertebrate primary type specimens in the collection of the University of Otago Department of Geology. [PDF]

J R Soc N Z
ABSTRACT The 47 vertebrate type specimens held in the University of Otago Geology Department are catalogued in detail. A short history of the collection is followed by lists of the type specimens under the Classes Actinopterygii, Reptilia, Aves and Mammalia. A fish trace‐fossil is included at the end of the Actinopterygii.
Robinson JH, Lee DE, Richards MD, White SEM, Fordyce RE.   +4 more
europepmc   +2 more sources

Early Tremadocian graptolites from the Arivechi area, Sonora, northern Mexico [PDF]

Estonian Journal of Earth Sciences, 2023
Graptolites from the early Tremadocian Anisograptus matanensis Biozone are identified from east-central Sonora, northwestern Mexico, within a carbonate-shelf succession deposited on the southwestern continental shelf margin of Laurentia.
Dulce Raquel Reyes-Montoya, Francisco Javier Cuen-Romero, Pilar Navas-Parejo, Nohemí Gámez-Meza, Juan José Palafox-Reyes, Juan Carlos Gutiérrez-Marco   +5 more
doaj   +1 more source

New contributions to the Ordovician biostratigraphy of the Western Precordillera, Argentina [PDF]

Estonian Journal of Earth Sciences, 2023
Upper Ordovician graptolites and conodonts are recorded from the Yerba Loca Formation in two sections, in the El Toro and Las Viudas creeks, from the El Tigre Range in the Western Precordillera of San Juan Province, Argentina. A collection of graptolites
Fernando E. Lopez, Gladys Ortega, Guillermo L. Albanesi, Aldo L. Banchig   +3 more
doaj   +1 more source

Upper Ordovician chronostratigraphic correlation between the Appalachian and Midcontinent basins [PDF]

Estonian Journal of Earth Sciences, 2023
Study of a subsurface core (named F688) from northern Indiana provides integrated data sets linking Katian chronostratigraphic records of the Appalachian and Midcontinent basins.
Cristiana J. P. Esteves, Patrick I. McLaughlin, Alyssa M. Bancroft, Thomas W. Wong Hearing, Mark Williams, Jahandar Ramezani, Poul Emsbo, Thijs R. A. Vandenbroucke   +7 more
doaj   +1 more source

Darriwilian (Middle Ordovician) graptolites from the northern margin of the Qaidam Basin (Qinghai, China) [PDF]

Estonian Journal of Earth Sciences, 2023
A restudy of the early Darriwilian graptolites from the Dameigou section in the Qaidam Basin provides some new information for graptolite biostratigraphy.
Liting Deng, Ming Li, Mo Huang
doaj   +1 more source

Tremadocian (Ordovician) reclined graptolites from Baishan, North China [PDF]

Estonian Journal of Earth Sciences, 2023
The Erdaopuzi section in the Baishan area of Jilin Province, northeast China, contains abundant late Tremadoc graptolites. However, there are some taxonomic controversies regarding the characters of the hand specimens that are difficult to identify.
Ming Li, Pengju Liu, Liting Deng, Lixia Li   +3 more
doaj   +1 more source