Results 61 to 70 of about 99,980 (305)

The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica

The Anatomical Record, EarlyView.
Abstract The upper carbonate concretion levels of the Romualdo Formation (Aptian, Brazil) have yielded several theropod dinosaur remains, including spinosaurids and the coelurosaurs Santanaraptor placidus and Mirischia asymmetrica, the phylogenetic affinities of which are controversial.
Rafael Delcourt, Orlando Nelson Grillo, Christophe Hendrickx, Maximilian Kellermann, Max Cardoso Langer   +4 more
wiley   +1 more source

First pterosaur remains from the Cretaceous of Poland [PDF]

, 2013
The first records of pterosaurs from the Cretaceous of Poland are reported, on the basis of fragmentary remains from the marine Upper Albian (Lower Cretaceous) of the Annopol Anticline, central Poland.
Machalski, Marcin, Martill, David M.
core  

An ontological morphological phylogenetic framework for living and extinct ray‐finned fishes (Actinopterygii)

The Anatomical Record, EarlyView.
Abstract The ray‐finned fishes include one out of every two species of living vertebrates on Earth and have an abundant fossil record stretching 380 million years into the past. The division of systematic knowledge of ray‐finned fishes between paleontologists working on extinct animals and neontologists studying extant species has obscured the ...
Jack Stack
wiley   +1 more source

Provenance Variations of Cretaceous Sandstones from Arkansas and Drainage Reorganization in Southern USA: Evidence from Detrital Zircon Ages

Geosciences
Detrital zircon (DZ) ages of Cretaceous sandstones in the United States contain critical spatial and temporal information on their sedimentary provenance and on the reorganization of drainage patterns.
Haibo Zou, David T. King, Mackenzie Benton, Zain Webb   +3 more
doaj   +1 more source

Characterization of a complex near-surface structure using well logging and passive seismic measurements [PDF]

Solid Earth, 2016
We combine geophysical well logging and passive seismic measurements to characterize the near-surface geology of an area located in Hontomin, Burgos (Spain). This area has some near-surface challenges for a geophysical study.
B. Benjumea, A. Macau, A. Gabàs, S. Figueras   +3 more
doaj   +1 more source

Histology and fossil diagenesis of a pterosaur tooth from the Crato Formation (Lower Cretaceous of Brazil)

The Anatomical Record, EarlyView.
Abstract Pterosaur dental biology remains poorly understood despite its importance for comprehending feeding strategies and flight adaptations. Here, we present the first comprehensive histological analysis of an ornithocheiriform pterosaur tooth from the Lower Cretaceous Crato Formation (Santana Group, Northeast Brazil).
Tito Aureliano, Matheus P. S. Rocha, Francisco P. Lima‐Filho, Aline M. Ghilardi   +3 more
wiley   +1 more source

Hydrocarbon potentiality and thermal maturity of the Cretaceous rocks in Al Baraka oil field, KomOmbo basin, south Egypt

Egyptian Journal of Petroleum, 2018
This paper aims to evaluate the hydrocarbon potentiality and thermal maturity of the Cretaceous source rocks in Al Baraka oil field in KomOmbo basin, south Egypt.
Mohamed M. El Nady, Fatma S. Ramadan, Mahmoud M. Hammad, Doaa A. Mousa, Naira M. Lotfy   +4 more
doaj   +1 more source

Decay in Upper Cretaceous Normapolles Exines [PDF]

Grana, 1993
Abstract Three different types of decay have been observed in exines of Normapolles type from anther 143 A 3, found in a clayey sand in the Upper Cretaceous fluviolacustrine sediments at Asen. The outer exine layer (tectum) is penetrated by numerous radial needlepores, interpreted as widened microchannels.
Annie Skarby, John R. Rowley
openaire   +1 more source

Late Maastrichtian carbon isotope stratigraphy and cyclostratigraphy of the Newfoundland Margin (Site U1403, IODP Expedition 342) [PDF]

, 2018
Earth’s climate during the Maastrichtian (latest Cretaceous) was punctuated by brief warming and cooling episodes, accompanied by perturbations of the global carbon cycle.
Agnini, Claudia, Batenburg, S., Blum, P., Bornemann, A., Boulila, S., Bown, P. R., Courn\ue8de, C., Fehr, A., Fiebig, J., Friedrich, O., Ghosh, A. K., Hasegawa, T., Hollis, C. J., Hull, P. M., Jo, K., Junium, C. K., Kaneko, M., Liebrand, D., Lippert, P. C., Liu, Z., Matsui, H., Moebius, I., Moriya, K., Nishi, H., Norris, R. D., Opdyke, B. N., Penman, D., R\uf6hl, U., Romans, B., Scher, H. D., Sexton, P., Takagi, H., Turner, S. K., Voigt, S., Westerhold, T., Whiteside, J. H., Wilson, P. A., Yamaguchi, T., Yamamoto, Y.   +38 more
core   +3 more sources

The cranial, mandibular, and hyoid anatomy of softshell turtles (Trionychidae): A revised character list for phylogenetic analysis

The Anatomical Record, EarlyView.
Abstract Softshell turtles (Pan‐Trionychidae) are an early branching clade of hidden‐necked turtles (Cryptodira) with a rich fossil record extending back to the Early Cretaceous. The evolutionary history of softshell turtles is still unresolved because of their conservative morphology combined with high levels of polymorphism related to morphological ...
Léa C. Girard, Walter G. Joyce
wiley   +1 more source