نتایج جستجو برای: late cretaceous period falcon

تعداد نتایج: 672578  

2003

Quantitative subsidence analysis of 26 wells in the Lusitanian basin provides new constraints on the western Iberian Mesozoic passive margin development. Backstripped tectonic subsidence curves show a three-fold subdivision of vertical motions from Late Triassic onward. Continental rifting was initiated during the Late Triassic and Early Jurassic. From Middle Jurassic onward a distinct differen...

2015
Hao Chen John M. Bell Nicolas A. Zavala Hanlee P. Ji Nancy R. Zhang

The progression and clonal development of tumors often involve amplifications and deletions of genomic DNA. Estimation of allele-specific copy number, which quantifies the number of copies of each allele at each variant loci rather than the total number of chromosome copies, is an important step in the characterization of tumor genomes and the inference of their clonal history. We describe a ne...

2015
Iván Narváez Christopher A. Brochu Fernando Escaso Adán Pérez-García Francisco Ortega Thierry Smith

The late Campanian-early Maastrichtian site of Lo Hueco (Cuenca, Spain) has provided a set of well-preserved crocodyliform skull and lower jaw remains, which are described here and assigned to a new basal eusuchian taxon, Lohuecosuchus megadontos gen. et sp. nov. The reevaluation of a complete skull from the synchronous site of Fox-Amphoux (Department of Var, France) allows us to define a secon...

2014
Jacek Szwedo

A short review of the state of the art of research on insects from the Cretaceous period is given. The recent achievements and priorities for future efforts are indicated. © 2014 Elsevier Ltd. All rights reserved. The Cretaceous, the geologic period from circa 145 to 66 million years (Ma) ago is a complex time period in Earth's history (Gale, 2000; Keller, 2008; Cohen et al., 2013). Generally s...

2017
Martin Kaspar Reiser Ralf Schuster Richard Spikings Peter Tropper Bernhard Fügenschuh

New Ar-Ar muscovite and Rb-Sr biotite age data in combination with structural analyses from the Apuseni Mountains provide new constraints on the timing and kinematics of deformation during the Cretaceous. Time-temperature paths from the structurally highest basement nappe of the Apuseni Mountains in combination with sedimentary data indicate exhumation and a position close to the surface after ...

2008
JOHN HOOLIHAN WILLIAM BURNHAM

Collection frequencies and certain characteristics of Peregrine Falcon (Falco peregrinus) semen were investigated using semen from a falcon trained to copulate on a specially designed hat. Semen volume increased significantly when collections were increased from two to three times/day, but cells/ejaculate decreased. No significant difference in number cells/ejaculate or cells/microliter was det...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2010
Zoltán Csiki Mátyás Vremir Stephen L Brusatte Mark A Norell

Islands are noted for the occurrence of aberrant, endemic, and dwarfed taxa (the "island effect"). Late Cretaceous vertebrate assemblages of Romania and elsewhere in Europe are classic examples of island faunas in the fossil record, and are characterized by dwarfed herbivorous dinosaurs and other endemic taxa that are noticeably primitive relative to their mainland contemporaries. Fossils of th...

Journal: :Science 1998
Sampson Witmer Forster Krause O'Connor Dodson Ravoavy

Recent discoveries of fossil vertebrates from the Late Cretaceous of Madagascar include several specimens of a large theropod dinosaur. One specimen includes a nearly complete and exquisitely preserved skull with thickened pneumatic nasals, a median frontal horn, and a dorsal projection on the parietals. The new materials are assigned to the enigmatic theropod group Abelisauridae on the basis o...

Journal: :Science 2007
G V R Prasad O Verma A Sahni V Parmar A Khosla

The sedimentary record documenting the northward drift of India (Late Cretaceous to late Early Eocene) has recently provided important clues to the evolution, radiation, and dispersal of mammals. Here, we report a definitive Late Cretaceous (Maastrichtian) archaic ungulate (Kharmerungulatum vanvaleni genus et species nova) from the Deccan volcano-sedimentary sequences exposed near Kisalpuri vil...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2010
Else Marie Friis Kaj Raunsgaard Pedersen Peter R Crane

In the second half of the nineteenth century, pioneering discoveries of rich assemblages of fossil plants from the Cretaceous resulted in considerable interest in the first appearance of angiosperms in the geological record. Darwin's famous comment, which labelled the 'rapid development' of angiosperms an 'abominable mystery', dates from this time. Darwin and his contemporaries were puzzled by ...

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