Results 31 to 40 of about 98,208 (293)

New ophthalmosaurid ichthyosaurs from the European lower cretaceous demonstrate extensive ichthyosaur survival across the Jurassic–Cretaceous boundary [PDF]

open access: yes, 2012
Background Ichthyosauria is a diverse clade of marine amniotes that spanned most of the Mesozoic. Until recently, most authors interpreted the fossil record as showing that three major extinction events affected this group during its history: one ...
Ralf Kosma (189585)   +65 more
core   +1 more source

Comparative cranial osteology of subadult eucentrosauran ceratopsid dinosaurs from the Two Medicine Formation, Montana, indicates sequence of ornamentation development and complex supraorbital ontogenetic change [PDF]

open access: yesActa Palaeontologica Polonica, 2021
The eucentrosauran centrosaurines Einiosaurus procurvicornis and Achelousaurus horneri are the two most commonly recovered ceratopsids from the Campanian Two Medicine Formation of northwestern Montana, USA.
JOHN P. WILSON, JOHN B. SCANNELLA
doaj   +1 more source

A new dromaeosaurid (Dinosauria: Theropoda) from the Upper Cretaceous Wulansuhai Formation of Inner Mongolia, China [PDF]

open access: yes, 2010
We describe a new dromaeosaurid theropod from the Upper Cretaceous Wulansuhai Formation of Bayan Mandahu, Inner Mongolia. The new taxon, Linheraptor exquisitus gen. et sp.
Tan, Q.   +32 more
core   +1 more source

Rifts, orogens, cratons, and global tectonics: Introduction

open access: yesГеодинамика и тектонофизика, 2017
A key role in developing the Earth theory is played by comparative studies of orogens, rifts, and platforms in the equatorial, middle and high latitudes of Asia and the adjacent Arctic regions.
S. V. Rasskazov
doaj   +1 more source

Dinosaur footprints and other Ichnofauna from the Cretaceous Kem Kem Beds of Morocco [PDF]

open access: yes, 2014
We describe an extensive ichnofossil assemblage from the likely Cenomanian-age 'lower' and 'upper' units of the 'Kem Kem beds' in southeastern Morocco.
Baidder, Lahssen   +23 more
core   +2 more sources

New Geochronological Age Constraint and Chemostratigraphy for Aptian Lacustrine Strata, Cedar Mountain Formation, Utah

open access: yesGeochemistry, Geophysics, Geosystems, 2023
The Early Cretaceous is an important time of transition in Earth history, marked by a succession of oceanic anoxic events and carbon cycle perturbations that drove changes on land and in the ocean.
Marina B. Suarez   +8 more
doaj   +1 more source

Dinosaur Bones from the Maestrazgo UNESCO Global Geopark (Teruel, Spain) [PDF]

open access: yesGeoconservation Research, 2021
The current territory of the Maestrazgo UNESCO Global Geopark has provided fossils that pioneered dinosaur research in Spain. The first Spanish dinosaur, Aragosaurus ischiaticus (published in 1987), five other new genera of dinosaurs and six species were
Luis Alcalá, Rafael Royo-Torres
doaj   +1 more source

Early Cretaceous biogeographic and oceanographic synthesis of Leg 123 (off Northwestern Australia) [PDF]

open access: yes, 1992
Biogeographic observations made by Leg 123 shipboard paleontologists for Lower Cretaceous nannofossils, foraminifers, radiolarians, belemnites, and inoceramids are combined in this chapter to evaluate the paleoceanographic history of the northwestern ...
Bown, P.   +13 more
core   +1 more source

PALEONTOLOGY AND PALEOGEOGRAPHY OF THE TETHYIAN AGGLUTINATED BENTHIC FORAMINIFERAL SPECIES OF THE GENUS SPIROPLECTINELLA [PDF]

open access: yesGeological Behavior, 2022
Thirty three small diagnostic benthic foraminiferal species of the Textulariid genus Spiroplectinella are common in the Late Cretaceous-Neogene rocks from many Tethyan localities: North Atlantic (USA, Mexico, Caribbean), South America (Brazil, Argentina,
Haidar Salim Anan
doaj   +1 more source

An Upper Cretaceous ichthyodectiform fish from Kyushu, Japan [PDF]

open access: yesResearch & Knowledge, 2017
Ichthyodectiform fishes are an exclusively extinct basal teleost clade, with a temporal range from the Middle Jurassic (Bathonian) to Upper Cretaceous (Maastrichtian).
Yoshitaka Yabumoto   +2 more
doaj   +1 more source

Home - About - Disclaimer - Privacy