Results 31 to 40 of about 97,186 (306)

Relationship between sedimentation and red karst landform during the Ordovician in Hunan, Chongqing and Guizhou

open access: yesCarsologica Sinica
The Ordovician red karst is a newly discovered geological landscape in Hunan, Chongqing and Guizhou. Its appearances, distributions and rhythms are distinctive.
Youzhi CHEN   +5 more
doaj   +1 more source

Using abundance data to assess the relative role of sampling biases and evolutionary radiations in Upper Muschelkalk ammonoids [PDF]

open access: yes, 2011
The Middle Triassic ammonoid genus Ceratites diversified spectacularly within the Germanic Muschelkalk Basin during the Anisian/Ladian (244–232 Mya). Previous studies have interpreted this diversification as a sequence of rapid, endemic radiations from a
Kiessling, Wolfgang   +1 more
core   +1 more source

Estimation of the dolomite content of carbonate rock outcrops based on spectral knowledge and machine learning

open access: yesFrontiers in Earth Science
Accurately estimating the dolomite content in carbonate rocks is crucial for optimizing oil and gas exploration and production strategies. Hyperspectral techniques for estimating dolomite content have advantages in terms of efficiency, cost-effectiveness,
Wei Wei   +6 more
doaj   +1 more source

Conchostracans as evidence of Jurassic levels in the Caturrita Formation, Faxinal do Soturno, Rio Grande do Sul, Brazi [PDF]

open access: yesGeologia USP. Série Científica, 2014
This paper focus on the first conchostracans (Crustacea, Spinicaudata) found at the São Luís outcrop (Caturrita Formation, Rosário do Sul Group), in Faxinal do Soturno, Rio Grande do Sul State, Brazil (29º33’ 29.09”S, 53º 26’ 54”W).
Rosemarie Rohn   +2 more
doaj   +1 more source

Early Pliocene Varanus (Squamata, Varanidae) remains from Megalo Emvolon, Thessaloniki, Greece

open access: yesThe Anatomical Record, EarlyView.
The article describes new cranial and postcranial varanid material from Megalo Emvolon Lower Pliocene vertebrate fossil site near Thessaloniki. The fossils, likely representing a single individual, are referred to Varanus cf. marathonensis. Abstract This study describes new fossil varanid material from a recently discovered fossil spot (MVL site) at ...
Chara Drakopoulou   +3 more
wiley   +1 more source

Spatial distribution of the stochastic discontinuities of Shazaoyuan granite masses in Beishan

open access: yes工程科学学报
Shazaoyuan granite masses are a substitute location for high-level radioactive waste disposal in China. The widely distributed stochastic discontinuities in the granite bodies in this area are crucial factors that control rock deformation and nuclide ...
Liang HUO   +4 more
doaj   +1 more source

New approaches to the architectural analysis of deltaic outcrops: Implications for subsurface reservoir characterization and paleoenvironmental reconstruction

open access: yesSedimentologika, 2023
This study defines a new workflow to investigate the internal facies architecture of a river-dominated delta deposit using outcrops of the Cretaceous Panther Tongue of the Star Point Sandstone in central Utah, U.S.A.
Claire E. Atlas   +3 more
doaj   +1 more source

Topology of Fracture Networks [PDF]

open access: yes, 2012
We propose a mapping from fracture systems consisting of intersecting fracture sheets in three dimensions to an abstract network consisting of nodes and links.
Alex eHansen   +5 more
core   +6 more sources

New craniodental materials of Falcarius utahensis (Theropoda: Therizinosauria) reveal patterns of intraspecific variation and cranial evolution in early coelurosaurians

open access: yesThe Anatomical Record, EarlyView.
Abstract Despite documented ecomorphological shifts toward an herbivorous diet in several coelurosaurian lineages, the evolutionary tempo and mode of these changes remain poorly understood, hampered by sparse cranial materials for early representatives of major clades. This is particularly true for Therizinosauria, with representative crania best known
William J. Freimuth, Lindsay E. Zanno
wiley   +1 more source

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