Results 151 to 160 of about 18,614 (286)

Geophysical investigation of the Santa Marta impact structure—Piauí State, Brazil

Meteoritics &Planetary Science, EarlyView.
Abstract The Santa Marta impact structure in northeastern Brazil, recognized as a partially preserved complex crater, was investigated through an integrated geophysical study employing magnetotelluric (MT) and gravity methods. Our research provides constraints on the crater's subsurface architecture.
Elienara Vasconcelos, João De Oliveira, Marcos Vasconcelos, Martyn Unsworth, Andrea Santos‐Matos, Florivaldo Sena   +5 more
wiley   +1 more source

New transitional fossil from late Jurassic of Chile sheds light on the origin of modern crocodiles. [PDF]

Sci Rep, 2021
Novas FE, Agnolin FL, Lio GL, Rozadilla S, Suárez M, de la Cruz R, de Souza Carvalho I, Rubilar-Rogers D, Isasi MP.   +8 more
europepmc   +1 more source

A new stem turtle from the Middle Jurassic of the Isle of Skye, Scotland, and a reassessment of basal turtle relationships

, 2009
A recent phylogenetic analysis of turtle interrelationships suggests that the Middle Jurassic was a crucial time period for understanding the evolution of crown-group turtles. However, turtle material of this age is scarce worldwide.
Anquetin, J.
core  

Geochemical investigation of impactites from the Boltysh impact structure and possible relationship to early Danian sediments from the Umbria–Marche Basin, Italy

Meteoritics &Planetary Science, EarlyView.
Abstract Within the Danian Scaglia Rossa Formation appears a regionally correlatable horizon cutting across multiple sections and outcrops within the Umbria–Marche Basin of NE Italy, where it is intercalated with uniform pelagic carbonate successions. This horizon is called “ALE layer” and has tentatively been interpreted as a fine‐grained volcanic ash.
Toni Schulz, Sophia Wernitznig, Christian Koeberl, Bérengère Mougel, Alessandro Montanari, Frédéric Moynier   +5 more
wiley   +1 more source

Exceptionally simple, rapidly replaced teeth in sauropod dinosaurs demonstrate a novel evolutionary strategy for herbivory in Late Jurassic ecosystems. [PDF]

BMC Ecol Evol, 2021
Melstrom KM, Chiappe LM, Smith ND.
europepmc   +1 more source

A new pterosaur (Pterodactyloidea: Azhdarchidae) from the Upper Cretaceous of Morocco

, 2010
The Kem Kem beds in South Eastern Morocco contain a rich early Upper (or possibly late Lower) Cretaceous vertebrate assemblage. Fragmentary remains, predominantly teeth and jaw tips, represent several kinds of pterosaur although only one species, the ...
David M Unwin, Baidder, Lahssen, David M Martill, Ibrahim, Nizar, Lahssen Baidder, D. M. Martill (4169125), Ibrahim Nizar, Unwin David M., S. Zouhri (7618280), Baidder Lahssen, Zouhri Samir, N. Ibrahim (7618271), L. Baidder (7618277), Martill, David M., Nizar Ibrahim, Samir Zouhri, Zhouri, Samir, Unwin, David M., Martill David M., David M. Unwin (7618274)   +19 more
core   +1 more source

Climate conditions on the South‐Iberian Palaeomargin during the latest Pliensbachian to early Toarcian: A mineralogical and geochemical study from hemipelagic deposits

Sedimentology, EarlyView.
ABSTRACT The integrated analysis of lithofacies, mineralogy and geochemistry of the hemipelagic marine succession exposed in La Cerradura section (South‐Iberian Palaeomargin) provides new information to characterise the palaeoenvironmental conditions during the latest Pliensbachian to early Toarcian, including the Jenkyns Event.
Chaima Ayadi, Isabel Abad, Elisa Laita, Ali Mokhtar Samet, Matías Reolid   +4 more
wiley   +1 more source

Spatial and temporal evolution of a coastal erg margin: the Middle Jurassic Page Sandstone, southern Utah, USA

Sedimentology, EarlyView.
ABSTRACT Aeolian deflationary events are erosive to static stages where sediment supply is insufficient to support bedform migration and preservation in the rock record. In the vicinity of shallow‐marine environments, inland rises of relative water table and associated generation of deflationary super surfaces may be driven by the onset of ...
Victor J. P. Hême de Lacotte, Chester H. C. Davies, Briony J. Bowler, Stuart M. Clarke, Thomas J. H. Dodd   +4 more
wiley   +1 more source

Rudists and the Pacific in the Late Jurassic and Early Cretaceous

, 2011
The Pacific dimension of Late Jurassic to Early Cretaceous rudist evolution shows four phases, which are described in this article in more detail.
Skelton, P.W., Sano, S., Masse, J.-P.
openaire   +1 more source

Porosity Preservation in Deeply Buried (8500 m) Jurassic Calcareous Mudstones of the Vienna Basin (Austria)

Terra Nova, EarlyView.
ABSTRACT Significant porosity of more than 5% was found at depths of more than 8500 m in poorly sorted, calcareous mudstones of the Malmian Mikulov Formation. These overpressured rocks are the main hydrocarbon source rock in the Vienna Basin. Core samples from present‐day depths of 8150 m to 8550 m were analysed using X‐ray diffraction and scanning ...
Susanne Gier, Jürgen Schieber, Andrea Forstner‐Schicker, Peter Krois   +3 more
wiley   +1 more source