نتایج جستجو برای: late cretaceous period falcon

تعداد نتایج: 672578  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1992
S B Hedges C A Hass L R Maxson

The geological association of the Greater Antilles with North and South America in the late Cretaceous led to the hypothesis that the present Antillean biota reflects those ancient land connections. Molecular data from diverse West Indian amphibians and reptiles and their mainland relatives support a more recent derivation of the Antillean vertebrate fauna by overwater dispersal. The catastroph...

Mohammad Elyas Moslempour Morteza Khalatbari-Jafari Rahim Dabiri Sara Shahdadi

Nosrat-Abad ophiolitic extrusive sequence, located in the Sistan Suture Zone, in south eastern Iran. The extrusive sequence, contains pillow lava, sheet flow and related volcanic-clastic breccias which have undergone low-grade metamorphism. This association shows calc alkaline to tholeiitic affinities. Interpretation of the geochemical data and behavior of the elements in different diagrams rev...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1976
S Weiner H A Lowenstam L Hood

Fossil glycoproteins of the soluble organic matrix are present in an 80-million-year-old mollusk shell from the Late Cretaceous Period. Discrete molecular weight components, as determined by gel electrophoresis, are preserved. The fossil organic matrix was compared with the organic matrix of a living representative species of the same superfamily. A particular repeating amino acid sequence, fou...

This research work introduces the Early Triassic, Late Triassic-Early Jurassic, and Early Cretaceous silica-rich sand levels at east and central Alborz, Kopeh-Dagh, and Central Iran, and compares them with the Permian silica-rich sand level in the Chirouk mine at east Iran. Ghoznavi and Gheshlaq loose sand in Alborz (Early Triassic-Early Jurassic), Soh quartzite in Central Iran (Early Triassic...

Journal: :Geological Society of America Bulletin 2021

Abstract In cordilleran-type orogens, subduction geometry exerts a fundamental control on the tectonic behavior of overriding plate. An integrated low-temperature, large thermochronological data set is used in this study to investigate burial and exhumation history plate northern Patagonia (40°–45°S). Thermal inverse modeling allowed us establish that ?2.5–4-km-thick section originally overlaid...

2010
William R. Guenthner David L. Barbeau Peter W. Reiners Stuart N. Thomson

[1] Existing paleogeographic reconstructions indicate that the northern Antarctic Peninsula was central to several Mesozoic and Cenozoic tectonic events that have implications for ocean circulation and continental margin evolution. To evaluate the exhumational record of these processes, we collected new samples and measured fission track and (U‐Th)/He cooling ages of apatite and zircon from 13 ...

Journal: :Science 2006
Corrie S Moreau Charles D Bell Roger Vila S Bruce Archibald Naomi E Pierce

We present a large-scale molecular phylogeny of the ants (Hymenoptera: Formicidae), based on 4.5 kilobases of sequence data from six gene regions extracted from 139 of the 288 described extant genera, representing 19 of the 20 subfamilies. All but two subfamilies are recovered as monophyletic. Divergence time estimates calibrated by minimum age constraints from 43 fossils indicate that most of ...

Journal: :geopersia 2012
mohsen ehteshami-moinabadi ali yassaghi abdolhossein amini

this paper presents evidence on mesozoic inversion of basin bounding faults within the taleqan-gajereh-lar paleograben (tglp) in central alborz range. for this purpose, well documented stratigraphy data across the tglp together with the new acquired structural data on the geometry and kinematics of the paleograben basin bounding faults are utilized. the tglp has evolved through the early and mi...

Journal: :Nature communications 2012
Stephen L Brusatte Richard J Butler Albert Prieto-Márquez Mark A Norell

The extinction of non-avian dinosaurs 65 million years ago is a perpetual topic of fascination, and lasting debate has focused on whether dinosaur biodiversity was in decline before end-Cretaceous volcanism and bolide impact. Here we calculate the morphological disparity (anatomical variability) exhibited by seven major dinosaur subgroups during the latest Cretaceous, at both global and regiona...

2005
Jason S. Reed James A. Spotila Kenneth A. Eriksson Robert J. Bodnar

An inferred burial and exhumation history of Pennsylvanian strata in the central Appalachian foreland basin is constrained by integrating palaeothermometers, geochronometers and estimated palaeogeothermal gradients.Vitrinite re£ectance data and £uid inclusion homogenization temperatures indicate that burial ofLower andUpperPennsylvanian strata of theAppalachianPlateau inWest Virginia exceeded 4...

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