Results 251 to 260 of about 71,903 (304)

Late Jurassic salamanders from northern China

Nature, 2001
With ten extant families, salamanders (urodeles) are one of the three major groups of modern amphibians (lissamphibians). Extant salamanders are often used as a model system to assess fundamental issues of developmental, morphological and biogeographical evolution.
K Q, Gao, N H, Shubin
openaire   +2 more sources

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
openaire   +1 more source

Late Jurassic paleoclimate of Central Africa

Palaeogeography, Palaeoclimatology, Palaeoecology, 2011
Abstract Paleopedology and geochemical analysis of Upper Jurassic deposits in the Stanleyville Group of Central Africa indicate harsh Late Jurassic paleoclimates in the interior of Gondwana. Subsurface samples collected from the Samba borehole near the center of the Congo Basin show only weak morphological evidence of pedogenesis, but are ...
Timothy S. Myers, Neil J. Tabor, Louis L. Jacobs   +2 more
openaire   +1 more source

Modelling Late Jurassic Milankovitch climate variations

Geological Society, London, Special Publications, 1995
Abstract Although largely circumstantial in character, evidence for orbitally-forced (Milankovitch) climate changes in Jurassic microrhythmic successions, such as those of the Lias and Kimmeridgian, is becoming more persuasive. We present here the results of experiments, using a general circulation model, testing ways in which ...
P. J. Valdes, B. W. Sellwood, G. D. Price   +2 more
openaire   +1 more source

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
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +2 more sources

EXCEPTIONALLY PRESERVED LATE JURASSIC GASTROPOD EGG CAPSULES

PALAIOS, 2015
Exceptionally preserved, phosphatized gastropod egg capsules from the uppermost Jurassic (upper Volgian) in Central Russia are reported. The egg capsules were attached to the inner side of the shell wall of empty body chambers of two ammonites. Due to phosphatization, the egg capsules retained their original morphology preserving both the lower ...
MICHAŁ ZATOŃ, ALEKSANDR A. MIRONENKO
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source