Results 241 to 250 of about 18,614 (286)

Late Jurassic magnetic polarity sequence

Earth and Planetary Science Letters, 1975
Abstract Polarity reversal sequences have been observed in the Brushy Basin Member of the Morrison Formation (Upper Jurassic, Kimmeridgian-Tithonian age) at two sites in western Colorado separated by 80 km. The two polarity reversal sequences display a good correlation of relative lengths and number of polarity intervals and thus may provide a ...
M.B. Steiner, C.E. Helsley
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A Late Jurassic Mafic Pluton in Newfoundland

Canadian Journal of Earth Sciences, 1974
A small alkaline ultramafic intrusion in central Newfoundland is dated as 135 ± 8 m.y. old and 139 ± 9 m.y. old by the K–Ar method on biotite. This is the first known Mesozoic pluton (aside from dikes) in Newfoundland. The occurrence, composition and age of the pluton and associated igneous rocks is similiar to, and perhaps related in origin to ...
J. Helwig, J. Aronson, D. S. Day
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Late Jurassic Sauropods in Chilean Patagonia

Ameghiniana, 2015
Abstract. A description is provided of the first sauropod remains (i.e., isolated vertebrae and appendicular bones) from the Late Jurassic of Aysen, in Chilean Patagonia (Toqui Formation, late Tithonian). Although the bones found are fragmentary, they still allow the recognition of an unsuspected sauropod diversity for this period in South America. The
Salgado, Leonardo, Novas, Fernando E., Suárez, Manuel, Cruz, Rita de la, Isasi, Marcelo, Rubilar Rogers, David, Vargas, Alexander O.   +6 more
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Diversity and biogeography patterns of Late Jurassic neoselachians (Chondrichthyes: Elasmobranchii)

Geological Society, London, Special Publications, 2008
Abstract The regional diversity and biogeographic patterns of Late Jurassic neoselachians at genus level in Europe were analysed based on samples and an extensive literature survey of about 40 localities ranging from the Oxfordian to Tithonian.
Kriwet, J, Klug, S
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A Late Jurassic Digging Mammal and Early Mammalian Diversification

Science, 2005
A fossil mammal from the Late Jurassic Morrison Formation, Colorado, has highly specialized teeth similar to those of xenarthran and tubulidentate placental mammals and different from the generalized insectivorous or omnivorous dentitions of other Jurassic mammals.
Zhe-Xi, Luo, John R, Wible
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A basal tyrannosauroid dinosaur from the Late Jurassic of China

Nature, 2006
The tyrannosauroid fossil record is mainly restricted to Cretaceous sediments of Laurasia, although some very fragmentary Jurassic specimens have been referred to this group. Here we report a new basal tyrannosauroid, Guanlong wucaii gen. et sp. nov., from the lower Upper Jurassic of the Junggar Basin, northwestern China. G.
Xing, Xu, James M, Clark, Catherine A, Forster, Mark A, Norell, Gregory M, Erickson, David A, Eberth, Chengkai, Jia, Qi, Zhao   +7 more
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Indian Ocean sediment distribution since the Late Jurassic

Marine Geology, 1978
Cores obtained by deep sea drilling in the Indian Ocean provide a sedimentary record from which are deduced changing patterns of sedimentation through the Late Mesozoic and Cenozoic. Comparisons between: (1) empirical subsidence curves and sediment sequences at individual sites; and (2) paleobathymetric reconstruction maps and past sediment ...
Robert B. Kidd, Thomas A. Davies
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The Late Jurassic–Early Cretaceous Rifting

2019
During the Late Jurassic and Early Cretaceous, Iberia experienced extensional and transtensional stresses leading to a complex rifting time interval. Africa–America–Europe relative motions determined the definition of the Iberian plate boundaries and the generation of rifted sedimentary basins and sub-basins along its continental margins and in the ...
Javier Martín-Chivelet, José López-Gómez, Roque Aguado, Consuelo Arias, José Arribas, María Eugenia Arribas, Marcos Aurell, Beatriz Bádenas, María Isabel Benito, Telm Bover-Arnal, Antonio Casas-Sainz, José Manuel Castro, Francisco Coruña, Ginés A. de Gea, Joan J. Fornós, Marian Fregenal-Martínez, Jesús García-Senz, David Garófano, Bernadí Gelabert, Jordi Giménez, Laura González-Acebrón, Joan Guimerà, Carlos L. Liesa, Ramón Mas, Nieves Meléndez, José Miguel Molina, Josep Anton Muñoz, Rocío Navarrete, Marina Nebot, Luis Miguel Nieto, Silvia Omodeo-Salé, Antonio Pedrera, Carlos Peropadre, Isabel Emma Quijada, María Luisa Quijano, Matías Reolid, Alejandro Robador, Juan Pedro Rodríguez-López, Antonio Rodríguez-Perea, Idoia Rosales, Pedro A. Ruiz-Ortiz, Francesc Sàbat, Ramón Salas, Ana R. Soria, Pablo Suarez-Gonzalez, Lorenzo Vilas   +45 more
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Fusion of caudal vertebrae in Late Jurassic sauropods

Journal of Vertebrate Paleontology, 1991
ABSTRACT Fusion of caudal vertebrae in the sauropod dinosaurs Apatosaurus, Diplodocus, and Camarasaurus is explained as the result of ossification of ligaments spanning consecutive centra. The ossification does not involve the intervertebral space or the annulus fibrosus of the disc and therefore represents true bridging.
Bruce M. Rothschild, David S Berman
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Late Jurassic Climates, Vegetation, and Dinosaur Distributions

The Journal of Geology, 2004
The Jurassic and Cretaceous are considered to have been warmer than today on the basis of various climate data and model studies. Here, we use the available global record of climate-sensitive sediments, plants, and dinosaurs to infer broadscale geographic patterns for the Late Jurassic.
P. McAllister Rees, Christopher R. Noto, J. Michael Parrish, Judith T. Parrish   +3 more
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