Results 31 to 40 of about 30,004 (307)

A new megaspilid wasp from Eocene Baltic amber (Hymenoptera: Ceraphronoidea), with notes on two non-ceraphronoid families: Radiophronidae and Stigmaphronidae [PDF]

open access: yesPeerJ, 2018
Ceraphronoids are some of the most commonly collected hymenopterans, yet they remain rare in the fossil record. Conostigmus talamasi Mikó and Trietsch, sp. nov. from Baltic amber represents an intermediate form between the type genus, Megaspilus, and one
István Mikó   +6 more
doaj   +2 more sources

Lower Cretaceous Angiosperms [PDF]

open access: yesNature, 1910
IN the course of my work at the British Museum on Cretaceous plants, I have examined a number of more or less perfectly petrified “woods.” Such specimens have generally been classed together as “Gymnosperms,” so that they have received little attention from palaeobotanists. As I am undertaking an exhaustive study of the Cretaceous plants, the keeper of
openaire   +2 more sources

Výskyt spodnokriedových magmatických hornín medzi Podbrančom a Myjavou [PDF]

open access: yesGeologické práce. Správy, 2020
Occurrences of magmatic rocks were identifid north of the settlement Belanskovci (part of Myjava town), on the ridge of the elevation point 464 m a. s. l. east of the settlement Podzámok (part of the Podbranč village).
Tamás Csibri   +2 more
doaj  

Provenance reconstructions. Article 2. Litho- and isotope-geochemical approaches and methods

open access: yesЛитосфера, 2020
Research subject. In this paper, we consider specific features of the use of litho- and isotopic-geochemical data for the purposes of provenance reconstruction.Methods and materials.
A. V. Maslov   +4 more
doaj   +1 more source

The palate and choanae structure of the Susisuchus anatoceps (Crocodyliformes, Eusuchia): phylogenetic implications [PDF]

open access: yesPeerJ, 2018
Crocodyliformes is a group with a broad fossil record, in which several morphological changes have been documented. Among known transformations the most iconic is perhaps the series of changes seen in the structural evolution of the choanae.
Karla J. Leite, Daniel C. Fortier
doaj   +2 more sources

Lower Cretaceous rocks of Sierra Los Chinos, east-central Sonora, Mexico [PDF]

open access: yesGeofísica Internacional, 2000
Most Lower Cretaceous rocks in Sonora are part of the Bisbee Group of southern Arizona, deposited within a basin considered to be an extension of the Gulf of Mexico into Texas, New Mexico, Arizona and Sonora.
José F. Longoria, Rogelio Monreal
doaj  

Mutual relations between petrographical and petrophysical properties of Cretaceous rock samples for some wells in the North Western Desert, Egypt

open access: yesEgyptian Journal of Petroleum, 2013
The petrographical and petrophysical analyses are very important to understand the factors controlling the reservoir quality. So, these techniques have been applied on rock samples collected from the Cretaceous section for four wells drilled in the North
M.A. Kassab   +4 more
doaj   +1 more source

A reassessment of Kelmayisaurus petrolicus, a large theropod dinosaur from the Early Cretaceous of China [PDF]

open access: yes, 2012
The Early Cretaceous fossil record of large-bodied theropods from Asia is poor, hindering comparison of Asian predatory dinosaur faunas with those from other continents. One of the few large Asian theropod specimens from this interval is a partial skull (
Stephen L. Brusatte   +12 more
core   +1 more source

First Record of Chimaeroid Fish (Holocephali: ’Edaphodontidae’) from the Lower Cretaceous of the Middle Volga Region [PDF]

open access: yesИзвестия Саратовского университета. Новая серия: Серия Науки о Земле
The record of a mandibular tooth plate of the chimaeroid fish Ischyodus sp. from the Lower Cretaceous deposits of the north of the Saratov Volga River Right Bank is described. The presumed age of the find is the Lower Aptian.
Popov, Evgeniy Valerievich   +1 more
doaj   +1 more source

A review of Mawsonia from the Ilhas Group, Marfim Formation (? Late Hauterivian), Recôncavo Basin [PDF]

open access: yesResearch & Knowledge, 2017
The Mawsoniidae family includes six genera Chinlea, Diplurus, Trachymetopon, Parnaibaia, Mawsonia and Axelrodichthys with an almost worldwide occurrence ranging from the Triassic to the Late Cretaceous.
Camila Cupello   +2 more
doaj   +1 more source

Home - About - Disclaimer - Privacy