Results 61 to 70 of about 113,392 (193)

Laurus macrocarpa Lesquereux from the mid-Cretaceous (Cenomanian) Dakota Formation, USA, is a chlamydospermous seed, not an angiosperm fruit

open access: yesActa Palaeobotanica
The fossil seed, Decaturospermum macrocarpum (Lesquereux) gen. nov. et comb. nov., is described based on specimens of latest Albian to mid-Cenomanian age (mid-Cretaceous) from the Dakota Formation of Nebraska, and Kansas, USA, which were previously ...
Steven R. Manchester, Peter R. Crane
doaj   +1 more source

New theropod (Tetanurae: Avetheropoda) material from the ‘mid’-Cretaceous Griman Greek Formation at Lightning Ridge, New South Wales, Australia [PDF]

open access: yesRoyal Society Open Science, 2019
The limited fossil record of Australian Cretaceous theropods is dominated by megaraptorids, reported from associated and isolated material from the Early Cretaceous of Victoria and the ‘Mid’-Cretaceous of central-north New South Wales and central ...
Tom Brougham   +2 more
doaj   +1 more source

Pollination of Cretaceous flowers

open access: yesProceedings of the National Academy of Sciences, 2019
Insect pollination of flowering plants (angiosperms) is responsible for the majority of the world’s flowering plant diversity and is key to the Cretaceous radiation of angiosperms. Although both insects and angiosperms were common by the mid-Cretaceous, direct fossil evidence of insect pollination is lacking.
Tong Bao   +3 more
openaire   +2 more sources

Paleomagnetic Pole Positions and Geomagnetic Secular Variation from the Cretaceous Ponta Grossa Dike Swarm (Brazil)

open access: yesGeofísica Internacional, 2015
A detailed paleomagnetic and rock magnetic investigation has been carried out on the Early Cretaceous Ponta Grossa dike swarm in southern Brazil. This formation seems an excellent target for paleomagnetic study.
Miguel Cervantes Solano   +8 more
doaj   +1 more source

A new small-bodied azhdarchoid pterosaur from the Lower Cretaceous of England and its implications for pterosaur anatomy, diversity and phylogeny

open access: yes, 2013
BackgroundPterosaurs have been known from the Cretaceous sediments of the Isle of Wight (southern England, United Kingdom) since 1870. We describe the three-dimensional pelvic girdle and associated vertebrae of a small near-adult pterodactyloid from the ...
Darren Naish (115424)   +11 more
core   +1 more source

The evolution of large-bodied theropod dinosaurs during the Mesozoic in Asia [PDF]

open access: yes, 2010
The fossil record of large-bodied, apex carnivorous theropod dinosaurs in Eastern Asia is now among the best understood in the world, thanks to new discoveries and reinterpretations of long-neglected fossils.
Benson, R. B. J.   +9 more
core   +1 more source

Late Cretaceous Gravitational Collapse of the Southern Sierra Nevada Batholith and Adjacent Areas Above Underplated Schists, Southern California [PDF]

open access: yes, 2012
The greater Sierra Nevada batholith (SNB) is an ~ 600 km long NNW-trending composite arc assemblage consisting of a myriad of plutons exhibiting a distinct transverse zonation in structural, petrologic, geochronologic, and isotopic patterns.
Chapman, Alan Daniel
core   +1 more source

ANALISE ISOTÓPICA DE OXIGÊNIO E CARBONO EM MICROFÓSSEIS DA FORMAÇÃO ROMUALDO, CRETACEO INFERIOR, BACIA DO ARARIPE, PERNAMBUCO, NORDESTE DO BRASIL

open access: yesGeochimica Brasiliensis, 2019
This work presents the analysis of C and O isotope values behavior in the carapace of ostracodes and foraminifera from the Romualdo Formation, Araripe Basin – PE.
Rilda Cardoso Araripe   +5 more
doaj   +1 more source

High diversity in the sauropod dinosaur fauna of the Early Lower Cretaceous Kirkwood Formation of South Africa: Implications for the Jurassic–Cretaceous transition [PDF]

open access: yes, 2015
The Kirkwood Formation of South Africa has long been recognised as having the potential to fill an important gap in the Mesozoic terrestrial fossil record.
Choiniere, JN   +3 more
core   +1 more source

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