The Arrival of Wrangellia and the Nevadan Orogeny: Late Triassic to Late Jurassic: Ca. 240–145 Ma

2017 ◽  
pp. 89-101
Author(s):  
Ronald C. Blakey ◽  
Wayne D. Ranney
Keyword(s):  
Late Jurassic ◽  
Late Triassic

scholarly journals A review of Palaeozoic and Mesozoic tetrapods from Greenland

2018 ◽  
Vol 66 ◽  
pp. 21-46 ◽  
Author(s):  
Marco Marzola ◽  
Octávio Mateus ◽  
Jesper Milàn ◽  
Lars B. Clemmensen
Keyword(s):  
Late Jurassic ◽  
Early Jurassic ◽  
Late Carboniferous ◽  
Late Triassic ◽  
Late Devonian ◽  
Early Triassic ◽  
Shallow Marine ◽  
East Greenland ◽  
Marine Deposits ◽  
Theropod Dinosaurs

This article presents a synthesis of Palaeozoic and Mesozoic fossil tetrapods from Greenland, including an updated review of the holotypes and a new photographic record of the main specimens. All fossil tetrapods found are from East Greenland, with at least 30 different known taxa: five stem tetrapods (Acanthostega gunnari, Ichthyostega eigili, I. stensioi, I. watsoni, and Ymeria denticulata) from the Late Devonian of the Aina Dal and Britta Dal Formations; four temnospondyl amphibians (Aquiloniferus kochi, Selenocara groenlandica, Stoschiosaurus nielseni, and Tupilakosaurus heilmani) from the Early Triassic of the Wordie Creek Group; two temnospondyls (Cyclotosaurus naraserluki and Gerrothorax cf. pulcherrimus), one testudinatan (cf. Proganochelys), two stagonolepids (Aetosaurus ferratus and Paratypothorax andressorum), the eudimorphodontid Arcticodactylus, undetermined archosaurs (phytosaurs and both sauropodomorph and theropod dinosaurs), the cynodont Mitredon cromptoni, and three mammals (Haramiyavia clemmenseni, Kuehneotherium, and cf. ?Brachyzostrodon), from the Late Triassic of the Fleming Fjord Formation; one plesiosaur from the Early Jurassic of the Kap Stewart Formation; one plesiosaur and one ichthyosaur from the Late Jurassic of the Kap Leslie Formation, plus a previously unreported Late Jurassic plesiosaur from Kronprins Christian Land. Moreover, fossil tetrapod trackways are known from the Late Carboniferous (morphotype Limnopus) of the Mesters Vig Formation and at least four different morphologies (such as the crocodylomorph Brachychirotherium, the auropodomorph Eosauropus and Evazoum, and the theropodian Grallator) associated to archosaurian trackmakers are known from the Late Triassic of the Fleming Fjord Formation. The presence of rich fossiliferous tetrapod sites in East Greenland is linked to the presence of well-exposed continental and shallow marine deposits with most finds in terrestrial deposits from the Late Devonian and the Late Triassic.

scholarly journals Mesozoic Coleopteran Faunas from Argentina: Geological Context, Diversity, Taphonomic Observations, and Comparison with Other Fossil Insect Records

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
María Belén Lara ◽  
Oscar Florencio Gallego ◽  
Lara Vaz Tassi
Keyword(s):  
Late Jurassic ◽  
Middle Triassic ◽  
Late Triassic ◽  
Animal Kingdom ◽  
Fossil Insect ◽  
San Luis ◽  
Fundamental Information ◽  
The World ◽  
Geological Units ◽  
Deseado Massif

The order Coleoptera is the most diversified group of the Class Insecta and is the largest group of the Animal Kingdom. This contribution reviews the Mesozoic insects and especially the coleopteran records from Argentina, based on bibliographical and unpublished materials (86 described species, 526 collected specimens). The material came from different geological units from the late Middle Triassic to the Late Triassic (Bermejo, Cuyo, and Malargüe basins) to the Middle-Late Jurassic and Early Cretaceous (Deseado Massif, Cañadón Asfalto, and San Luís Basin). The coleopteran record is composed of 29 described species with 262 collected specimens (isolated elytra) mainly represented by Triassic species and only four specimens recorded in Jurassic units, all of them currently unpublished. These fossil coleopterans provide fundamental information about the evolution of insects in the Southern Hemisphere and confirm the Triassic Argentinean insect deposits to be among the most important in the world.

The systematic position of the Late Jurassic alleged dinosaur Macelognathus (Crocodylomorpha: Sphenosuchia)

2005 ◽  
Vol 42 (3) ◽  
pp. 307-321 ◽  
Author(s):  
Ursula B Göhlich ◽  
Luis M Chiappe ◽  
James M Clark ◽  
Hans-Dieter Sues
Keyword(s):  
Late Jurassic ◽  
Upper Jurassic ◽  
Systematic Position ◽  
Lower Jurassic ◽  
Late Triassic ◽  
Morrison Formation ◽  
Postcranial Skeleton ◽  
Western Colorado ◽  
New Material ◽  
Limb Posture

Macelognathus vagans was described by O.C. Marsh in 1884, based on a mandibular symphysis from the Upper Jurassic Morrison Formation of Wyoming. Often considered a dinosaur but later tentatively referred to the Crocodylia, its phylogenetic identity has until now been enigmatic. New material of this species from the Morrison Formation of western Colorado demonstrates its affinities with basal crocodylomorphs commonly grouped together as the Sphenosuchia, which are characterized by a gracile postcranial skeleton with erect limb posture. Macelognathus shares features with Kayentasuchus from the Lower Jurassic Kayenta Formation of Arizona and Hallopus, which may be from the Morrison Formation of eastern Colorado. The new material constitutes the youngest definitive occurrence of a sphenosuchian, previously known from the Late Triassic to the Middle or Late? Jurassic.

scholarly journals The evolution of the Triassic-Jurassic Maliac oceanic lithosphere: insights from the supra-ophiolitic series of Othris (continental Greece)

2015 ◽  
Vol 186 (6) ◽  
pp. 399-411 ◽  
Author(s):  
Jacky Ferrière ◽  
Frank Chanier ◽  
Peter O. Baumgartner ◽  
Paulian Dumitrica ◽  
Martial Caridroit ◽  
...  
Keyword(s):  
Continental Crust ◽  
Late Jurassic ◽  
Structural Data ◽  
Oceanic Lithosphere ◽  
Late Triassic ◽  
Major Result ◽  
Data Set ◽  
Thrust Sheets ◽  
Sedimentary Succession ◽  
Major Reference

AbstractMajor ophiolitic thrust sheets are widespread within the internal Hellenides, particularly in the Pelagonian domain (Greece and Albania). The ophiolitic sheets are notably well exposed in western Othris mountains of continental Greece. In that area, the structural stacking of oceanic nappes obducted in the Jurassic is particularly well constrained. New sedimentological and structural data from recently studied outcrops, together with new micro-paleontological data, allow to reconsider the architecture of the ophiolitic nappes and their evolution in the Othris mountains. Our new data set includes notably the description of a Mid-Late Jurassic sedimentary succession, from basal litharenites and radiolarites to syn-obduction mélange, on top of the uppermost Mega Isoma ophiolitic Unit. These results are crucial in the perspective of constraining the Jurassic contractional evolution of the Maliac Ocean from the beginning of the subduction and intra-oceanic obduction to the final obduction on the Pelagonian continental crust. Another major result concerns the dating of primary conformable series of Middle and Late Triassic age on top of the pillow-lavas of the Fourka unit. Since this lava unit, with MORB affinities, is one of the syn-obduction Jurassic nappes, we propose that this very large Fourka nappe represents the major reference unit of the initial (Triassic) Maliac oceanic crust.

The tectonic evolution of the Tibetan Plateau

1988 ◽  
Vol 327 (1594) ◽  
pp. 379-413 ◽  
Keyword(s):  
Tibetan Plateau ◽  
Late Jurassic ◽  
Middle Eocene ◽  
Late Triassic ◽  
The Tibetan Plateau ◽  
Peninsular India ◽  
Lhasa Terrane ◽  
Lateral Extrusion ◽  
Palaeomagnetic Data ◽  
Normal Thickness

The Tibetan Plateau, between the Kunlun Shan and the Himalayas, consists of terranes accreted successively to Eurasia. The northernmost, the Songban Ganzi Terrane, was accreted to the Kunlun (Tarim-North China Terrane) along the Kunlun-Qinling Suture during the late Permian. The Qiangtang Terrane accreted to the Songban-Ganzi along the Jinsha Suture during the late Triassic or earliest Jurassic, the Lhasa Terrane to the Qiangtang along the Banggong Suture during the late Jurassic and, finally, Peninsular India to the Lhasa Terrane along the Zangbo Suture during the Middle Eocene. The Kunlun Shan, Qiangtang and Lhasa Terranes are all underlain by Precambrian continental crust at least a billion years old. The Qiangtang and Lhasa Terranes came from Gondwanaland. Substantial southward ophiolite obduction occurred across the Lhasa Terrane from the Banggong Suture in the late Jurassic and from the Zangbo Suture in the latest Cretaceous-earliest Palaeocene. Palaeomagnetic data suggest successive wide Palaeotethyan oceans during the late Palaeozoic and early Mesozoic and a Neotethys which was at least 6000 km wide during the mid-Cretaceous. Thickening of the Tibetan crust to almost double the normal thickness occurred by northward-migrating north-south shortening and vertical stretching during the mid-Eocene to earliest Miocene indentation of Asia by India; Neogene strata are almost flat-lying and rest unconformably upon Palaeogene or older strata. Since the early Miocene, the northward motion of India has been accommodated principally by north south shortening both north and south of Tibet. From early Pliocene to the Present, the Tibetan Plateau has risen by about two kilometres and has suffered east-west extension. Little, if any, of the India Eurasia convergence has been accommodated by eastward lateral extrusion.

scholarly journals A new, nearly complete stem turtle from the Jurassic of South America with implications for turtle evolution

2008 ◽  
Vol 4 (3) ◽  
pp. 286-289 ◽  
Author(s):  
Juliana Sterli
Keyword(s):  
South America ◽  
Late Jurassic ◽  
Cladistic Analysis ◽  
Upper Jurassic ◽  
Upper Triassic ◽  
Late Triassic ◽  
Closure Mechanism

Turtles have been known since the Upper Triassic (210 Myr old); however, fossils recording the first steps of turtle evolution are scarce and often fragmentary. As a consequence, one of the main questions is whether living turtles (Testudines) originated during the Late Triassic (210 Myr old) or during the Middle to Late Jurassic ( ca 160 Myr old). The discovery of the new fossil turtle, Condorchelys antiqua gen. et sp. nov., from the Middle to Upper Jurassic ( ca 160–146 Myr old) of South America (Patagonia, Argentina), presented here sheds new light on early turtle evolution. An updated cladistic analysis of turtles shows that C. antiqua and other fossil turtles are not crown turtles, but stem turtles. This cladistic analysis also shows that stem turtles were more diverse than previously thought, and that until the Middle to Upper Jurassic there were turtles without the modern jaw closure mechanism.

Significance of radiolarian age data to the Mesozoic tectoni and sedimentary evolution of the northern Pindos Mountains, Greece

1992 ◽  
Vol 129 (4) ◽  
pp. 385-400 ◽  
Author(s):  
Gregory Jones ◽  
Patrick de Wever ◽  
Alastair H. F. Robertson
Keyword(s):  
Late Jurassic ◽  
Ocean Basin ◽  
Late Triassic ◽  
Reduced Form ◽  
Sedimentary Evolution ◽  
Early Tertiary ◽  
Clastic Sediments ◽  
Marine Carbonates ◽  
Significant Compression ◽  
Two Phases

AbstractRadiolarians were extracted from siliceous sediments of the northern Pindos Mountains, in an attempt to establish the chronology of tectonic and stratigraphic events related to the evolution of the Pindos ocean basin. Three separate phases of siliceous sedimentation were identified: (i) (mid-) late Triassic; (ii) mid-late Jurassic and (iii) mid-late Cretaceous. The first two phases are also known from the Pindos and Sub-Pelagonian zones of southern and central Greece, and elsewhere in the Dinarides andHellenides. However, the occurrence of Cretaceous radiolarites in the west central Tethyan region is somewhat unusual. Field observations suggest thatfrom the mid-late Triassic through to the mid Jurassic, radiolarites were deposited on volcanic basement, or were interbedded with sediments associated with the late rifting/spreading stages in the development of the Pindos ocean. Radiolarites of mid-late Jurassic age are commonly interbedded with clastic sediments of ophiolitic derivation. This coincides with a phase of significant compression within the Hellenides, which caused intra-oceanic deformation of the Pindos ophiolite. The ophiolite was subsequently emplaced onto the margin of the Pelagonian microcontinent in latest Jurassic time (Kim-meridgian-early Tithonian), as evidenced by transgressive marine carbonates. However, the Pindos basin survived in reduced form until the early Tertiary, allowing radiolarites to accumulate again within Cretaceous post-tectonic clastic sequences.

Revision of the bizarre Mesozoic scorpionflies in the Pseudopolycentropodidae (Mecopteroidea)

2005 ◽  
Vol 36 (4) ◽  
pp. 443-458 ◽  
Author(s):  
David Grimaldi ◽  
Alexandr Rasnitsyn ◽  
Zhang Junfeng ◽  
Nicholas Fraser
Keyword(s):  
New Species ◽  
Late Jurassic ◽  
Hind Wing ◽  
Early Jurassic ◽  
Western Hemisphere ◽  
Late Triassic ◽  
Similar Species ◽  
Antennal Flagellum ◽  
The Family

AbstractThe Mesozoic family Pseudopolycentropodidae presently consists of seven described species from the mid-Triassic to the Late Jurassic of Europe and Asia. Pseudopolycentropus prolatipennis Whalley, from the Early Jurassic of England, is revised based on re-examination of the type. Four new species are described herein that add significant distributional and stratigraphic extensions to the family. Pseudopolycentropodes virginicus Grimaldi and Fraser, gen. n., sp. n. from the Late Triassic (Carnian) of Virginia USA is the first species of the family from the Western Hemisphere. Pseudopolycentropus daohugouensis Zhang, sp. n. from the Late Jurassic of China is very similar to P. latipennis Martynov, 1927 from the Late Jurassic of Kazakhstan. Four specimens belonging to two very similar species in mid-Cretaceous amber from northern Burma (Myanmar), Parapolycentropus burmiticus Grimaldi and Rasnitsyn, gen. n., sp. n. and P. paraburmiticus Grimaldi and Rasnistyn, sp. n., are the only specimens of the family from the Cretaceous. The amber species are exceptional, with the hind wing reduced to a minute lobe, the antennal flagellum modified into an arista, labial palps are lost, and – like the Late Jurassic species — the laciniae and what are probably mandibles are modified into a long, stylet-like proboscis. What the species with long proboscides fed upon is ambiguous, but it was doubtfully blood. Complete preservation in amber of morphological details, particularly the female terminalia, confirms previous views that this unusual group is phylogenetically basal to Recent Mecoptera.

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