scholarly journals The giant pliosaurid that wasn’t: revising the marine reptiles from the Kimmeridgian (Upper Jurassic) of Krzyżanowice, Poland

2021 ◽  
Vol 66 ◽  
Author(s):  
Daniel Madzia ◽  
Tomasz Szczygielski ◽  
Andrzej Wolniewicz
Keyword(s):  
Upper Jurassic ◽  
Marine Reptiles

Mineral composition and gemological characteristics of the fossil marine reptiles of the Ulyanovsk region

2018 ◽  
pp. 12-16 ◽  
Author(s):  
D. A. Petrochenkov
Keyword(s):  
Chemical Composition ◽  
Bone Tissue ◽  
Mineral Composition ◽  
Bone Structure ◽  
Upper Jurassic ◽  
Marine Reptiles ◽  
Ulyanovsk Region ◽  
Impurity Elements ◽  
Wide Assortment

Fossils of marine reptiles are a new jewelry and ornamental material and collected in the Ulyanovsk region from the Upper Jurassic deposits. They consist of (wt. %): calcite — 52, apatite — 24 and pyrite — 23, and also gypsum presents. The contents of radioactive and carcinogenic elements are close to background. The original bone structure of reptiles is preserved. Apatite replaces the bone tissue of marine reptiles, forming a cellular framework. According to the chemical composition, apatite refers to fluorohydroxyapatite with an increased Sr content. The size of the crystals is finely-dispersed. Calcite and pyrite fill the central parts of the cells. Calcite crystals of isometric and elongated shape, 0,01—0,05 mm in size, form blocks up to 0,3 mm during intergrowth. Calcite fills thin, discontinuous veins along the contour of cells with a width of up to 0,03 mm. In calcite, among the impurity elements, there are (wt. %, on the average): Mg — 0,30, Mn — 0,39 and Fe — 0,96. Pyrite forms a dispersed impregnation in calcite and apatite, content of impurities is, wt. %: Ni — up to 0,96 and Cu — up to 0,24. On technological and decorative characteristics of fossils of sea reptiles of Ulyanovsk region are qualitative jewelry and ornamental materials of biomineral group, allowing to make a wide assortment of jewelry and souvenir products.

scholarly journals First occurrence of a gigantic pliosaurid plesiosaur in the late Jurassic (Kimmeridgian) of Mexico

2003 ◽  
Vol 174 (3) ◽  
pp. 271-278 ◽  
Author(s):  
Marie-Céline Buchy ◽  
Eberhard Frey ◽  
Wolfgang Stinnesbeck ◽  
José Guadalupe López-Oliva
Keyword(s):  
Vertebral Column ◽  
Late Jurassic ◽  
Upper Jurassic ◽  
South American ◽  
Western Tethys ◽  
Marine Reptiles ◽  
Family Level ◽  
First Occurrence ◽  
Additional Support ◽  
The University

Abstract Reinvestigation of a partial vertebral column from the Kimmeridgian La Caja Formation of Mexico, housed in the University of Linares (Mexico), and previously attributed to a dinosaur, proves to be from a very large pliosaurid plesiosaur. This specimen represents the first plesiosaur described from the Jurassic of Mexico. Its length has been estimated at 15 metres and, as a juvenile, is considered to be one of the largest Jurassic marine reptiles. The remains of this animal are here described. The morphology of the vertebral column is not diagnostic beyond family level. Large pliosaur vertebrae of a similar size are known from the Upper Jurassic of Europe, and are often referred to the genera Liopleurodon or Simolestes but these identifications are based only upon the size of the centra and have no taxonomic justification. A portion of rostrum with teeth was discovered together with the vertebral column but is unfortunately now lost. The Mexican pliosaur fills geographical and chronological gaps between western Tethys and South American pliosaurs, and is an additional support to the hypothesis of a Hispanic corridor linking at least temporarily the NW European marine province with the western South American marine (Pacific) realm during the late Jurassic.

First occurrence of the genus Dakosaurus (Crocodyliformes, Thalattosuchia) in the Late Jurassic of Mexico

2007 ◽  
Vol 178 (5) ◽  
pp. 391-397 ◽  
Author(s):  
Marie-Céline Buchy ◽  
Wolfgang Stinnesbeck ◽  
Eberhard Frey ◽  
Arturo H. Gonzalez Gonzalez
Keyword(s):  
Central America ◽  
Late Jurassic ◽  
Upper Jurassic ◽  
San Juan ◽  
Salt Glands ◽  
Large Space ◽  
Marine Reptiles ◽  
First Occurrence ◽  
Northeastern Mexico ◽  
The Village

Abstract The fragmentary rostrum of a thalattosuchian is described. The specimen comes from the vicinity of the village of San Juan de los Dolores, next to Los Lirios, Coahuila, northeastern Mexico. Associated ammonites allow to assign the specimen to the Kimmeridgian section (Upper Jurassic) of the La Casita Formation. Because of its massiveness, its cranial architecture and the morphology of its teeth, the specimen is referred to the genus Dakosaurus, but is too incomplete for further determination. The genus is known by few specimens from the Late Jurassic of Europe and Argentina, and was until now unknown from North and Central America. It represents a new but expected element of the assemblage of marine reptiles populating the Mexican Gulf during the Late Jurassic. The specimen is one of the few members of the group preserving in 3 dimensions and visible, the preorbital portion of the rostrum, and especially of the nasopharyngeal canal; it confirms the existence of a large space possibly housing salt glands rostral to the orbits.

Colymbosaurines from the Upper Jurassic of European Russia and their implication for palaeobiogeography of marine reptiles

2019 ◽  
Vol 100 (1) ◽  
pp. 197-218 ◽  
Author(s):  
Maxim S. Arkhangelsky ◽  
Nikolay G. Zverkov ◽  
Mikhail A. Rogov ◽  
Ilya M. Stenshin ◽  
Evgeniya M. Baykina
Keyword(s):  
Upper Jurassic ◽  
European Russia ◽  
Marine Reptiles

The large superpredators’ teeth from Middle Triassic of Poland

2013 ◽  
Vol 2 (1) ◽  
pp. 91-94 ◽  
Author(s):  
Dawid Surmik ◽  
Tomasz Brachaniec
Keyword(s):  
Marine Sediments ◽  
Middle Triassic ◽  
Morphological Features ◽  
Marine Reptiles

ABSTRACT An unusual large teeth, finding from time to time in marine sediments of Muschelkalk, Silesia, Poland indicate the superpredators occurrence. According to size and morphological features the teeth are similar to archosaurs or giant marine reptiles.

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