scholarly journals Unevaluated preliminary geologic cross section of uranium-bearing Upper Triassic rocks extending from Palo Duro Canyon across the Matador Arch, through the type locality of Dockum Group, to the White River Reservoir, Crosby County, Texas

1976 ◽  
Author(s):  
Warren Irvin Finch ◽  
J.C. Wright ◽  
Beth O. Davis
Keyword(s):  
Cross Section ◽  
Upper Triassic ◽  
Type Locality ◽  
White River ◽  
River Reservoir

Discovery of Upper Ladinian ammonoids at the type locality of the Lower Carnian Desatoyense Zone (South Canyon, New Pass Range, Nevada)

2008 ◽  
Vol 82 (1) ◽  
pp. 176-182 ◽  
Author(s):  
Marco Balini
Keyword(s):  
North America ◽  
Marine Invertebrates ◽  
Upper Triassic ◽  
Type Locality

South Canyon, located in the New Pass Range in central Nevada (Fig. 1), is one of the most important localities for Upper Triassic marine invertebrates in North America. This site yields very rich ammonoid faunas, as well as cnidarians (Muller, 1936; Stanley, 1979; Roniewicz and Stanley, 1998), foraminifers (Gazdzicki and Stanley, 1983), bivalves (Waller and Stanley, 1998, 2005; Hopkin and McRoberts, 2003), and brachiopods.

Shastasaurus altispinus(Ichthyosauria, Shastasauridae) from the Upper Triassic of the El Antimonio district, northwestern Sonora, Mexico

1989 ◽  
Vol 63 (6) ◽  
pp. 930-939 ◽  
Author(s):  
Jack M. Callaway ◽  
Judy A. Massare
Keyword(s):  
Upper Triassic ◽  
Current Understanding ◽  
Type Locality ◽  
Lower Jaw ◽  
First Occurrence ◽  
New Material ◽  
Shasta County ◽  
Early Late

New specimens ofShastasaurus altispinusMerriam are recognized from the Upper Triassic Antimonio Formation in the El Antimonio district of northwestern Sonora, Mexico. This represents the first occurrence of the species outside of its type locality in Shasta County, California, and the first known occurrence of Triassic ichthyosaurs from Mexico. Some remains are well preserved, but in general they are fragmented, structurally distorted, and incomplete; however, they enhance the current understanding of the morphology of a species that has been known hitherto only from an even more incomplete holotype. The material is the first from anyShastasaurusthat preserves the anterior portions of the skull and lower jaw and implanted teeth. Revised diagnoses for the genus and species are given on the basis of the new material. Biostratigraphic zonation furnishes an early Late Carnian age for the specimens, which is in accord with that for the holotype.

scholarly journals New material and revision ofMelanorosaurus thabanensis, a basal sauropodomorph from the Upper Triassic of Lesotho

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e1639 ◽  
Author(s):  
Claire Peyre de Fabrègues ◽  
Ronan Allain
Keyword(s):  
Phylogenetic Analysis ◽  
Southern Africa ◽  
Upper Triassic ◽  
Early Jurassic ◽  
Type Locality ◽  
Late Triassic ◽  
Original Publication ◽  
Stratigraphic Position ◽  
New Material

Melanorosaurusis a genus of basal sauropodomorph that currently includes two species from Southern Africa. In this paper, we redescribe the holotype femur ofMelanorosaurus thabanensisfrom the Elliot Formation of Lesotho, as well as associated remains. The stratigraphic position of this taxon is reviewed, and it is clear that it comes from the Lower Elliot Formation being, therefore, Late Triassic in age, and not Early Jurassic as originally described. The knowledge of the anatomy of the basal sauropodomorph of Thabana Morena is enhanced by the description of six new skeletal elements from the type locality. The femur and the ilium from Thabana Morena are diagnostic and characterized by unusual proportions. The first phylogenetic analysis including both this specimen andMelanorosaurusis conducted. This analysis leads to the conclusion that the femur described in the original publication ofMelanorosaurus thabanensiscan no longer be referred toMelanorosaurus. For these reasons, we hereby createMeroktenosgen. nov. to encompassMeroktenos thabanensiscomb. nov.

scholarly journals New record of Prozostrodon brasiliensis (Eucynodontia: Prozostrodontia) from its type-locality (Upper Triassic, Southern Brazil): comments on the endocranial morphology

2020 ◽  
Vol 23 (4) ◽  
pp. 259-269
Author(s):  
Leonardo Kerber ◽  
Agustín G. Martinelli ◽  
Pablo Gusmão Rodrigues ◽  
Ana Maria Ribeiro ◽  
Cesar Leandro Schultz ◽  
...  
Keyword(s):  
New Record ◽  
Upper Triassic ◽  
Type Locality ◽  
Southern Brazil

Triassic sponges (Sphinctozoa) from Hells Canyon, Oregon

1988 ◽  
Vol 62 (03) ◽  
pp. 419-423 ◽  
Author(s):  
Baba Senowbari-Daryan ◽  
George D. Stanley
Keyword(s):  
Endemic Species ◽  
Upper Triassic ◽  
Island Arc ◽  
Tropical Island ◽  
The Family ◽  
Wallowa Terrane ◽  
Unique Condition ◽  
Hells Canyon

Two Upper Triassic sphinctozoan sponges of the family Sebargasiidae were recovered from silicified residues collected in Hells Canyon, Oregon. These sponges areAmblysiphonellacf.A. steinmanni(Haas), known from the Tethys region, andColospongia whalenin. sp., an endemic species. The latter sponge was placed in the superfamily Porata by Seilacher (1962). The presence of well-preserved cribrate plates in this sponge, in addition to pores of the chamber walls, is a unique condition never before reported in any porate sphinctozoans. Aporate counterparts known primarily from the Triassic Alps have similar cribrate plates but lack the pores in the chamber walls. The sponges from Hells Canyon are associated with abundant bivalves and corals of marked Tethyan affinities and come from a displaced terrane known as the Wallowa Terrane. It was a tropical island arc, suspected to have paleogeographic relationships with Wrangellia; however, these sponges have not yet been found in any other Cordilleran terrane.

XUV Absorption Spectra of Carbon Ions

1988 ◽  
Vol 102 ◽  
pp. 71-73
Author(s):  
E. Jannitti ◽  
P. Nicolosi ◽  
G. Tondello
Keyword(s):  
Absorption Spectra ◽  
Cross Section ◽  
Theoretical Calculations ◽  
Photoionization Cross Section ◽  
Carbon Ions

AbstractThe photoabsorption spectra of the carbon ions have been obtained by using two laser-produced plasmas. The photoionization cross-section of the CV has been absolutely measured and the value at threshold, σ=(4.7±0.5) × 10−19cm2, as well as its behaviour at higher energies agrees quite well with the theoretical calculations.

Elastic Scattering in Electron Microscopy

1973 ◽  
Vol 31 ◽  
pp. 252-253
Author(s):  
J. Langmore ◽  
M. Isaacson ◽  
J. Wall ◽  
A. V. Crewe
Keyword(s):  
Electron Microscopy ◽  
Elastic Scattering ◽  
Cross Section ◽  
Quantum Noise ◽  
Dark Field ◽  
Elastic Cross Section ◽  
Biological Molecules ◽  
Dark Field Microscopy ◽  
Field Systems ◽  
Effects Of Radiation

High resolution dark field microscopy is becoming an important tool for the investigation of unstained and specifically stained biological molecules. Of primary consideration to the microscopist is the interpretation of image Intensities and the effects of radiation damage to the specimen. Ignoring inelastic scattering, the image intensity is directly related to the collected elastic scattering cross section, σɳ, which is the product of the total elastic cross section, σ and the eficiency of the microscope system at imaging these electrons, η. The number of potentially bond damaging events resulting from the beam exposure required to reduce the effect of quantum noise in the image to a given level is proportional to 1/η. We wish to compare η in three dark field systems.

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