Results 11 to 20 of about 1,947,082 (272)

The postcranial skeleton ofMonolophosaurus jiangi(Dinosauria: Theropoda) from the Middle Jurassic of Xinjiang, China, and a review of Middle Jurassic Chinese theropods [PDF]

open access: yesGeological Magazine, 2009
AbstractThe Middle Jurassic was a critical time in the evolution of theropod dinosaurs, highlighted by the origination and radiation of the large-bodied and morphologically diverse Tetanurae. Middle Jurassic tetanurans are rare but have been described from Europe, South America and China.
Xi-Jin, Z.   +3 more
openaire   +4 more sources

Large Igneous Province Record Through Time and Implications for Secular Environmental Changes and Geological Time‐Scale Boundaries

open access: yesGeophysical Monograph Series, Page 1-26., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Richard E. Ernst   +8 more
wiley  

+11 more sources

Environmental distribution of Bathonian (Middle Jurassic) neoselachians in southern England [PDF]

open access: yes, 2004
Within the Bathonian (Middle Jurassic) a wide range of depositional environments were present across Britain. Within this dominantly carbonate shelf setting, there is a general palaeoenvironmental transition from open marine shelf in the south of England,
Underwood, Charlie J., Ward, D.J.
core   +6 more sources

Rhaetian to Middle Jurassic

open access: yes
The Altena Group consists mainly of dark argillaceous mudstones deposited between the Rhaetian and the Oxfordian in the Laurasian Sea, an epeiric sea on the northwestern margin of the Tethys Ocean. The group has been subdivided into the Sleen, Aalburg, Posidonia Shale, Werkendam, and Brabant formations.
Alexandre, João P.Trabucho   +1 more
openaire   +3 more sources

MIDDLE JURASSIC NAUTILOIDEA FROM WESTERN FRANCE

open access: yesRivista Italiana di Paleontologia e Stratigrafia, 2004
The Middle Jurassic shelf margin limestones and marly limestones of Western France yield quite numerous Nautilida. This record is here described for the first time in detail, nine genera and more than forty species, whose range rarely exceeds one or two ...
PATRICK BRANGER
doaj   +2 more sources

Environmental controls on the distribution of neoselachian sharks and rays within the British Bathonian (Middle Jurassic). [PDF]

open access: yes, 2004
Extensive sampling from a range of facies within the Bathonian (Middle Jurassic) of southern England has allowed the palaeoenvironmental distribution of a number of taxa of neoselachian sharks and rays to be assessed.
Underwood, Charlie J.
core   +5 more sources

Elemental geochemistry of the Middle Jurassic shales in the northern Qaidam Basin, northwestern China: Constraints for tectonics and paleoclimate

open access: yesOpen Geosciences, 2021
The elemental geochemical characteristics of mudstones/shales are good tracers for indicating the evolution of tectonics, paleoenvironment, and paleoclimate.
Hou Haihai   +5 more
doaj   +1 more source

Burial and thermal history simulation of the Middle Jurassic source rocks in Matruh basin, north Western Desert, Egypt [PDF]

open access: yesDelta Journal of Science, 2023
The Middle Jurassic Khatatba Formation, a source rock for hydrocarbons in Egypt's Matruh basin, was modeled using geological and geochemical data from the Apidose-1X well. The 1D basin modeling helps construct burial and thermal geo-histories and predict
Walaa Ali, Mohamed Fagelnour
doaj   +1 more source

First diagnostic marine reptile remains from the Aalenian (Middle Jurassic): a new ichthyosaur from southwestern Germany. [PDF]

open access: yesPLoS ONE, 2012
BackgroundThe Middle Jurassic was a critical time in the evolutionary history of ichthyosaurs. During this time interval, the diverse, well-studied faunas of the Lower Jurassic were entirely replaced by ophthalmosaurids, a new group that arose sometime ...
Erin E Maxwell   +2 more
doaj   +1 more source

Youngest occurrences of rhomaleosaurid plesiosaurs indicate survival of an archaic marine reptile clade at high palaeolatitudes [PDF]

open access: yesActa Palaeontologica Polonica, 2015
Rhomaleosaurid plesiosaurians were a common and ecologically significant component of Early Jurassic marine faunas, primarily as large-bodied predators. They declined in abundance and made their last fossil appearance in the Middle Jurassic. However, the
Roger B.J. Benson   +2 more
doaj   +1 more source

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