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Search Results: 1 - 10 of 304 matches for " Triassic "
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Pickworthiidae and Aqabarellidae New Family (Caenogastropoda, Mollusca) of Aqaba, Jordan: Their Larval Shells and Remarks about Their Evolution and Relation  [PDF]
Ikhlas Alhejoj, Klaus Bandel, Tariq Al-Najjar
Natural Science (NS) , 2016, DOI: 10.4236/ns.2016.89044
Abstract: Among small sized gastropods found in Aqaba (Jordan),?Sansonia?occurs relatively common with?Sansoniacebuana?whichis?recognized from the the fringing reef near the Marine Biological Station at Aqaba, while?Mecoliotia?and?Chrystella?are rare.?Mecoliotiaaqabaensis?n. sp and?Chrystellashinaqi?n. sp are described with the later resembling?Chrystellafinckhi. They are compared with other members of the Pick-worthiidae, of which a new species of?Discrevina?from Indonesia is described. A species of?Aqabarella?new genus resembles in shape of its teleoconch members of the Pickworthiidae but its protoconch is distinct in ornament of the larval shell and shape of the aperture and it is placed in it own family, Aqabarellidae.?Aqabarella urdunensis?is relatively more common than the rare?
Plantas triásicas del Grupo Rincón Blanco, provincia de San Juan, Argentina
Ottone,Eduardo G.;
Ameghiniana , 2006,
Abstract: fluvial and lacustrine strata of the portezuelo and casa de piedra formations, rincón blanco group, middle to upper triassic of san juan province, yield a distinctive taphoflora. the portezuelo formation plant remains are relatively scarce and mostly include peltasperms (lepidopteris madagascariensis carpentier and antevsia sp.), together with bennettitales (taeniopteris sp.), and probable coniferales (incertae sedis (ovule scale?) sp. b) and pteridosperm fronds (incertae sedis sp. a). the fossil plant assemblage recovered from the casa de piedra formation is more abundant and mainly includes corystospermales (dicroidium incisum (du toit) anderson and anderson, d. odontopteroides var. moltense retallack, d. odontopteroides var. obtusifolium johnston, d. odontopteroides var. remotum (szajnocha) retallack, xylopteris densifolia (du toit) frenguelli, x. remotipinnulia (anderson and anderson) comb. nov., x. rigida (dun) jain and delevoyras, x. spinifolia (tenison-woods) frenguelli and zuberia zuberi (szajnocha) frenguelli, but also sphenophyta (neocalamites sp.) and cycadales (pseudoctenis sp. a and p. sp. b). the flora of the rincón blanco group would chiefly represent a substratum of herbaceous and shrubby vegetation. although the portezuelo and casa de piedra formations have been referred to the cortaderitian and florian stages, on the basis of regional correlations, the lack of diagnostic taxa difficult close comparisons of the rincón blanco group flora with local biozones.
Nuevos registros de Cycadales y Cycadeoidales del Triásico superior del río Biobío, Chile
LEPPE,MARCELO; MOISAN,PHILIPPE;
Revista chilena de historia natural , 2003, DOI: 10.4067/S0716-078X2003000300011
Abstract: a contribution to the knowledge of cycadales and cycadeoidales present in the upper triassic of the santa juana formation (carnian-raetian) in the bio-bío region of chile is provided. the groups are represented by the species pseudoctenis longipinnata anderson & anderson, pseudoctenis spatulata du toit and pterophyllum azcaratei herbst & troncoso. a new species pseudoctenis truncata nov. sp. is described. they appear to be related to other typical elements of the paleofloristic assamblages from the south-occidental border of gondwanaland.
Ichthyosaur from Guizhou, China
Chun Li
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885856
Abstract: A new ichthyosaur is named and described on the basis of two well-preserved skeletons from the Late Triassic Wayao Member of Falang Formation, Guizhou Province, southwestern China. The specimens represent a longipinnate ichthyosaur with a set of characters transitional from the Triassic forms to the Jurassic forms. It is similar to shastasaurids of the Triassic in the relative size and shape of the limbs but resemblesOphthalmosaurus andBaptanodon of the Jurassic in the shape of the skull. The new taxon differs from all other ichthyosaurs found in China in its unusual large orbit, distinct rostrum, and the hind limbs, that are slightly stronger than the fore ones.
New knowledge of the Upper Triassic in Liupanshan Basin, Ningxia, China
Daliang Li,Shuxin Dong,Shenghui Deng
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883081
Abstract: Based upon the new data of spore-pollen, plant and bivalve fossils, the coal-bearing strata in the Liupanshan Basin, Ningxia Hui Autonomous Region, Northwest China, which were formerly assigned to the Middle Jurassic Yan’an Formation, are divided into two parts in the present study. The major part is assigned to the Upper Triassic and the overlying part remains in the Jurassic. The new division is of significance to the oil-gas exploration of the basin and the interpretation of the sedimentary and tectonic history and the geographic environment of Liupanshan area during the early Mesozoic.
A new cyamodontoid placodont from Triassic of Guizhou, China
Chun Li,O. Rieppel
Chinese Science Bulletin , 2002, DOI: 10.1360/02tb9094
Abstract: A new cyamodontoid placodont is named (Psephochelys polyosteoderma gen. et. sp. nov.) and described based on a three-dimensionally preserved specimen. The material comes from the Wayao Member of the Falang Formation (Carnian, Late Triassic) in Guizhou Province, southwestern China. The skull of Psephochelys shows a unique combination of characteristics observed in Psephoderma and Placochelys, and the carapace is diagnostic of a new taxon as well. The ventral dermal armor of Psephochelys differs from all other known cyamodontoids in that it comprises irregular marginal osteoderms in loose contact with each other, and gastralia between them. The cranial suture pattern is in part difficult to analyze due to apparent co-ossification of elements, or poor delimitation of sutures. This affects primarily the demarcation of the nasal from the prefrontal, and the relation between the anterior part of the parietal, posterior ends of the frontals, and postfrontals. However, the postfrontal appears to enter the anteromedial margin of the upper temporal fenestra, a characteristic otherwise known from Placodus, but not from other cyamodontoids. However, given the difficulties of interpretation of this skull, additional material is required to unequivocally assess some details of the pattern of cranial sutures.
A new cyamodontoid placodont from Triassic of Guizhou, China

Chun Li,O Rieppel,

科学通报(英文版) , 2002,
Abstract: A new cyamodontoid placodont is named (Psephochelys polyosteoderma gen. et. sp. nov.) and described based on a three-dimensionally preserved specimen. The material comes from the Wayao Member of the Falang Formation (Carnian, Late Triassic) in Guizhou Province, southwestern China. The skull of Psephochelys shows a unique combination of characteristics observed in Psephoderma and Placochelys, and the carapace is diagnostic of a new taxon as well. The ventral dermal armor of Psephochelys differs from all other known cyamodontoids in that it comprises irregular marginal osteoderms in loose contact with each other, and gastralia between them. The cranial suture pattern is in part difficult to analyze due to apparent co-ossification of elements, or poor delimitation of sutures.This affects primarily the demarcation of the nasal from the prefrontal, and the relation between the anterior part of the parietal, posterior ends of the frontals, and postfrontals.However, the postfrontal appears to enter the anteromedial margin of the upper temporal fenestra, a characteristic otherwise known from Placodus, but not from other cyamodontoids. However, given the difficulties of interpretation of this skull, additional material is required to unequivocally assess some details of the pattern of cranial sutures.
Epigondolella pseudodiebeli (Kozur, 1972) (Conodonta) aus den oberen Amphiclin-Schichten oberhalb Po e, Westslowenien
Anton Ramov?
Geologija , 1997,
Abstract:
Bivalve reefs from the Upper Triassic of Iran
Franz T. Fürsich,Michael Hautmann
Museologia Scientifica e Naturalistica , 2005,
Abstract: In the Upper Triassic Nayband Formation of east-central Iran, bivalves repeatedly form small patch reefson a mid to outer mixed carbonate-siliciclastic ramp in close stratigraphic neighbourhood to coral and coralspongereefs. In contrast to other Triassic-Jurassic bivalve-dominated patch reefs, the bivalve reefs of theNayband Formation are characterized by a comparatively high diversity of framebuilding taxa. These includetaxa from three different families, i.e., the ostreids Umbostrea emamii, U. iranica and U.? aff. parasiticum, the prospondylids Newaagia stocklini and Persia monstrosa, and the plicatulids Eoplicatula parvadehensis and Pseudoplacunopsis asymmetrica. The bivalve reef constructors may have had a competitive advantage over coral and calcareous sponges in environments characterized by a higher degree of turbidity and/or higher nutrient contents.
The Controlling of Deformation Basing on Strain Partitioning Model: Case Study to Gafsa Basin (Southern Tunisian Atlas)  [PDF]
Soulef Amamria, Mohamed Sadok Bensalem, Mohamed Ghanmi, Fouad Zargouni
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.31004
Abstract: One of the principal parameters to study the tectonics deformation is the relation between the shortening axis and the direction of preexistent principal fault. It is important to verify this parameter in the belts structures. The aim of this contribution is to check this notion in the Atlassic structures, especially in the southern limit of Tunisian Atlas: Gafsa fault. The strain partitioning model proposed in the interpretation of geodynamics of Gafsa chains suggests the coexistence of thrusting and strike-slip faults during the same tectonics phase. The application of this model requires a particular geometry between the shortening axis and the direction of fault, and indeed the obliquity of preexistent faults by the reported shortening axis interprets us a transpressive context. The slickenside examination shows the coexistence of thrusting and strike-slip faults. The application of model of strain partitioning requires a decollement level which is confirmed in the Gafsa basin by the upper level of Triassic series. These parameters confirm a particular relation thin and thick-skinned and the maximum of deformation is cover, although the basement structures permeate simple passive transport of the deformation along the Triassic decollement level. These problems confirm the assumption of the evolution of the shortening axis during geological events and especially the rotation of Africa and Eurasia.
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