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| WANG,XIAOLIN; KELLNER,ALEXANDER W. A.; CHENG,XIN; JIANG,SHUNXING; WANG,QIANG; SAYÃO,JULIANA M.; RODRIGUES,TAISSA; COSTA,FABIANA R.; LI,NING; MENG,XI; ZHOU,ZHONGHE. |
| The counterpart of a previously described non-pterodactyloid pterosaur with an egg revealed the presence of a second egg inside the body cavity of this gravid female. It clearly shows that pterosaurs had two functional oviducts and demonstrates that the reduction of one oviduct was not a prerequisite for developing powered flight, at least in this group. Compositional analysis of one egg suggests the lack of a hard external layer of calcium carbonate. Histological sections of one femur lack medullary bone and further demonstrate that this pterosaur reached reproductive maturity before skeletal maturity. This study shows that pterosaurs laid eggs even smaller than previously thought and had a reproductive strategy more similar to basal reptiles than to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pterosauria; Wukongopteridae; Reproductive Biology; Jurassic; China. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401599 |
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| FUEYO,GEORGINA M. DEL; GNAEDINGER,SILVIA C.; DIAZ,MAITEN A. LAFUENTE; CARRIZO,MARTÍN A.. |
| Abstract Abstract: Anatomically preserved conifer-like leaves from the Middle Jurassic La Matilde Formation at the Barda Blanca locality in the Gran Bajo de San Julián area, southern Patagonia are described here. Leaves are assigned to conifers based on the following foliar features: thick-walled epidermal cells, a sclerenchymatic hypodermis, resin canals and transfusion tracheids associated with the vascular bundle. General mesophyll anatomy and inferred foliar morphology suggest a similarity to large, broad, linear-lanceolate, multi-veined conifer-like leaves. The general foliar habit indicates an affinity with the large, multi-veined leaves of the Araucariaceae; especially with those exhibited by the species of the Araucaria sections, Araucaria and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conifers; Jurassic; La Matilde Formation; Leaves; Patagonia; Permineralized. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400510 |
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| Dera, Guillaume; Prunier, Jonathan; Smith, Paul L.; Haggart, James W.; Popov, Evgeny; Guzhov, Alexander; Rogov, Mikhail; Delsate, Dominique; Thies, Detlev; Cuny, Gilles; Puceat, Emmanuelle; Charbonnier, Guillaume; Bayon, Germain. |
| The breakup of Pangea and onset of growth of the Pacific plate led to several paleoenvironmental feedbacks, which radically affected paleoclimate and ocean chemistry during the Jurassic. Overall, this period was characterized by intense volcanic degassing from large igneous provinces and circum-Panthalassan arcs, new oceanic circulation patterns, and changes in heat and humidity transports affecting continental weathering. Few studies, however, have attempted to unravel the global interactions linking these processes over the long-term. In this paper, we address this question by documenting the global changes in continental drainage and surface oceanic circulation for the whole Jurassic period. For this purpose, we present 53 new neodymium isotope values... |
| Tipo: Text |
Palavras-chave: Neodymium isotopes; Jurassic; Paleoclimate; Paleoceanography; Continental drainage. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00179/29015/27443.pdf |
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| Geyer, O.F.. |
| El Jurásico de la península de la Guahira comprende las formaciones Cheterló (más antigua), Cajú, Pachepa y Jipi (más moderna), las cuales forman el grupo de Cocinas. Sólo las formaciones Cajú y Jipi parecen ser en su totalidad depósitos marinos. De acuerdo con las faunas de amonitas y corales, la formación Jipi pertenece al Kimeridgiano inferior. Se discute además la posición estratigráfica de la formación Uipana. Del Jurásico de la Guajira no se dan relaciones paleogeográficas directas a las regiones norteandinas, porque tanto en Colombia como en Venezuela están ausentes, o no se conocen depósitos marinos correspondientes. En la Guajira así como más al este, en la isla de Trinidad, puede demostrarse que en un mar del Jurásico superior llegó hasta el... |
| Tipo: Journal Contribution |
Palavras-chave: Jurassic. |
| Ano: 1968 |
URL: http://hdl.handle.net/1834/3258 |
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