Results 1 to 10 of about 1,776,549 (292)

Late Cretaceous and Danian limestone

open access: yesDanmarks Geologiske Undersøgelse Serie B, 1982
At the termination of the Early Cretaceous period, the sea transgressed large earlier land areas. The transgression, the reduced relief of the continents, the generally diminished tectonic activity, the climatic change, and the enormous production of calcareous nannoplankton in the oceans profoundly changed the gross facies pattern in the North Sea ...
Kirsten Lieberkind   +3 more
openaire   +2 more sources

On the age of fossil diatoms

open access: yesActa Palaeobotanica, 2015
The finding of fossil freshwater diatoms in late Cretaceous chert in Mexico suggests - together with all the discoveries of fossil freshwater diatoms known from positions older than the Cretaceous - that the extinct marine Cretaceous diatom taxa cannot ...
Siemińska Jadwiga
doaj   +1 more source

The first iguanian lizard from the Mesozoic of Africa [PDF]

open access: yesRoyal Society Open Science, 2016
The fossil record shows that iguanian lizards were widely distributed during the Late Cretaceous. However, the biogeographic history and early evolution of one of its most diverse and peculiar clades (acrodontans) remain poorly known.
Sebastián Apesteguía   +3 more
doaj   +1 more source

Geomagnetic excursion in the late Cretaceous [PDF]

open access: yesGeophysical Journal International, 1983
Summary. Two sedimentary cores from the western Pacific display a palaeomagnetic record of the late Cretaceous long normal interval and the boundary reversed interval corresponding to seafloor spreading anomalies 33-34. Near the young end of this reversed interval, a systematic excursion of inclinations is observed in both cores.
openaire   +1 more source

Protolith age of the Altar and Carnero complexes and latest Cretaceous–Miocene deformation in the Caborca–Altar region of northwestern Sonora, Mexico

open access: yesRevista Mexicana de Ciencias Geológicas, 2019
In the Caborca–Altar area of northwest Sonora, variably deformed and metamorphosed sedimentary and volcanic rocks crop out in a northwest-southeast–trending belt (El Batamote belt) at least 70 km long.
Carl E. Jacobson   +5 more
doaj   +1 more source

A Ceratopsian Dinosaur from the Lower Cretaceous of Western North America, and the Biogeography of Neoceratopsia.

open access: yesPLoS ONE, 2014
The fossil record for neoceratopsian (horned) dinosaurs in the Lower Cretaceous of North America primarily comprises isolated teeth and postcrania of limited taxonomic resolution, hampering previous efforts to reconstruct the early evolution of this ...
Andrew A Farke   +3 more
doaj   +1 more source

Small theropod teeth from the Late Cretaceous of the San Juan Basin, northwestern New Mexico and their implications for understanding latest Cretaceous dinosaur evolution.

open access: yesPLoS ONE, 2014
Studying the evolution and biogeographic distribution of dinosaurs during the latest Cretaceous is critical for better understanding the end-Cretaceous extinction event that killed off all non-avian dinosaurs.
Thomas E Williamson, Stephen L Brusatte
doaj   +1 more source

BIOGEOGRAPHIC HISTORIES AND CHRONOLOGIES OF DERIVED IGUANODONTIANS

open access: yesPublicación Electrónica de la Asociación Paleontológica Argentina, 2015
The geographic distributions, chronology, and phylogenetic relationships of derived iguanodontians describe a biogeographic history of active intercontinental dispersal, which is tested via comparison with eustatic sea level fluctuations.
Jason J. Head, Yoshitsugu Kobayashi
doaj  

First Late Cretaceous ichthyofauna from the Kababish Formation and its paleoenvironmental significance and paleogeographic implications [PDF]

open access: yesFossil Record
This study documents the first record of a fossil fish assemblage from the Upper Cretaceous Kababish Formation of north-central Sudan, associated with the dyrosaurid crocodyliform Brachiosuchus kababishensis.
Khalafallah Salih   +5 more
doaj   +3 more sources

Geochemical characteristics of natural gas in the hydrocarbon accumulation history, and its difference among gas reservoirs in the Upper Triassic formation of Sichuan Basin, China

open access: yesJournal of Natural Gas Geoscience, 2016
The analysis of hydrocarbon generation, trap formation, inclusion homogenization temperature, authigenic illite dating, and ESR dating were used to understand the history of hydrocarbon accumulation and its difference among gas reservoirs in the Upper ...
Peng Wang   +5 more
doaj   +1 more source

Home - About - Disclaimer - Privacy