Results 81 to 90 of about 92,675 (274)

A spinose appendage fragment of a problematic arthropod from the Early Ordovician of Morocco [PDF]

, 2006
A highly spinose fragment of a possibly raptorial appendage from the Arenig (Early Ordovician) of the Upper Fezouata Formation north of Zagora, southeastern Morocco is described as the arthropod Pseudoangustidontus duplospineus gen. et sp. nov.
Tetlie, Odd Erik, Van Roy, Peter
core   +1 more source

Refined Ordovician timescale reveals no link between asteroid breakup and biodiversification

Nature Communications, 2017
The catastrophic disruption of the L chondrite parent body in the asteroid belt c. 470 Ma initiated a prolonged meteorite bombardment of Earth that started in the Ordovician and continues today. Abundant L chondrite meteorites in Middle Ordovician strata
Anders Lindskog, M. M. Costa, C. Rasmussen, J. Connelly, M. Eriksson   +4 more
semanticscholar   +1 more source

Early Cretaceous–Late Miocene Basin–Mountains Pattern in the Northeastern Margin of the Tibetan Plateau, NW China: Evidence From Detrital Zircon Chronology in the Lanzhou Basin

Geological Journal, EarlyView.
Using DZmix and DZstats models, we quantified the contributions of potential sources of the Lanzhou basin. Our findings indicate that the Cenozoic cooling and denudation signals primarily originated from Qilian and West Qinling, which were the main sediment sources.
Hang Liu, Hu–jun Gong, Fen–hong Luo, Rui Zhang   +3 more
wiley   +1 more source

Research progress on marine oil and gas accumulation in Tarim Basin

Shiyou shiyan dizhi, 2020
In recent years, great achievements have been made in the exploration of ultra-deep marine oil and gas in the Tarim Basin. New oil and gas discoveries have been achieved in the Shunbei Ordovician, Tazhong Cambrian and Tahe deep strata, which provide ...
Yi GU, Jiwen HUANG, Cunshan JIA, Zhibing SHAO, Yongge SUN, Qinghua LU   +5 more
doaj   +1 more source

Chitinozoan biozonation and new lithostratigraphical data in the Upper Ordovician of the Fauquez and Asquempont areas (Brabant Massif, Belgium) [PDF]

, 2005
status ...
Storme, Annelies, Van Grootel, Geert, Van Noten, Koen, Vanmeirhaeghe, Jan, Verniers, Jacques   +4 more
core   +1 more source

Population structure of graptolite assemblages [PDF]

, 1998
Graptolite rhabdosomes display a diverse suite of morphologies. The range of morphotypes present within most moderate to high diversity assemblages from the Ordovician and Silurian is similar, despite the different taxonomic composition of the faunas at ...
Brenchley, Bulman, Bulman, Cate, Deevey, Finney, Hutt, Kaesler, Kemp, Kidwell, Kirk, Kirk, Kurtén, Lenz, Loydell, Palmer, Pearson, Rigby, Rigby, Rigby, Rigby, Snyder, Thorsteinsson, Underwood, Underwood, Urbanek, Urbanek, Williams   +27 more
core   +1 more source

Mercury spikes suggest volcanic driver of the Ordovician-Silurian mass extinction

Scientific Reports, 2017
The second largest Phanerozoic mass extinction occurred at the Ordovician-Silurian (O-S) boundary. However, unlike the other major mass extinction events, the driver for the O-S extinction remains uncertain.
Qing Gong, Xiangdong Wang, Laishi Zhao, S. Grasby, Zhong‐Qiang Chen, Lei Zhang, Yang Li, L. Cao, Zhihong Li   +8 more
semanticscholar   +1 more source

Gene and Genome Duplication in Spiders

Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, EarlyView.
In chelicerates whole genome duplications (WGDs) were identified in distinct groups. While there is evidence that Xiphosurans/horseshoe crabs had three rounds of WGD and arachnopulmonates (e.g. spiders and scorpions) had one WGD, in many other arachnid groups no WGD was identified.
Chetan Munegowda, Matthias Pechmann, Nikola‐Michael Prpic‐Schäper, Natascha Turetzek   +3 more
wiley   +1 more source

A new marrellomorph euarthropod from the Early Ordovician of Argentina [PDF]

, 2016
Marrellomorphs (class Marrellomorpha) are a group of Paleozoic arthropods with a very poor fossil record. Here we describe a new marrellomorph arthropod Mimetaster florestaensis sp. nov. from the Tremadocian (earliest Ordovician) of Argentina.
Aris, María Josefina, Corronca, Jose Antonio, Pardo, Paolo Luciano, Quinteros, Andres Sebastian   +3 more
core   +1 more source

Age calibration of the Lower Ordovician Fezouata Lagerstätte, Morocco

, 2018
The Fezouata Lagerstatte, discovered in the Lower Ordovician rocks of Morocco, is a Konservat-Lagerstatte of prime scientific importance. It provides access not only to the ‘shelly’ (skeletonized) part of its fossil assemblages, but also to non ...
B. Lefebvre, J. C. Gutiérrez-Marco, O. Lehnert, Emmanuel L. O. Martin, H. Nowak, Mustapha Akodad, K. Hariri, T. Servais   +7 more
semanticscholar   +1 more source