Upper cretaceous
This paper reports the first discovery of large-bodied dromaeosaurid fossil materials (Dinosauria: Theropoda) from the lower Upper Cretaceous Quantou Formation, in Changchun area, Jilin Province. The specimens include a manual ungual and a pedal penultimate phalanx. The manual ungual is the larger of the two and laterally flattened, curved and sickle-shaped from the middle to the distal end ...Feb 1, 2022 · Abstract. A new troodontid dinosaur, Papiliovenator neimengguensis gen. et sp. nov., from the Upper Cretaceous (Campanian) Wulansuhai Formation at Bayan Manduhu, Inner Mongolia, China, is described here. The holotype (BNMNH-PV030) consists of a nearly complete cranium and fragmentary postcranial bones in semi-articulation and this specimen is ...
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The Cretaceous/Palaeogene mass extinction eradicated 76% of species on Earth 1, 2. It was caused by the impact of an asteroid 3, 4 on the Yucatán carbonate platform in the southern Gulf of Mexico ...Positive δ 13 C carb and δ 13 C org excursions occur in the mid-Cretaceous black shales (Wang et al., 2001), while negative δ 13 C carb and δ 13 C org excursions take place in the Upper Cretaceous red-beds, coincident with lower fractions of biogenic barite (Wang et al., 2005, Zou et al., 2005). These differences point to lower primary ...depth diagrams delineating the chronology of the Upper Cre- taceous sequences as well as Late Cretaceous sedimentation rates. We use this sequence ...The intracontinental Benue Trough was initiated during the Lower Cretaceous in relation with the Atlantic Ocean opening. The first stage of its evolution started in the Aptian, forming isolated basins with continental sedimentation. ... In the Albian times, a great delta developed in the Upper Benue Trough, while the first marine transgression ...Ages of the Upper Cretaceous formations of the Gobi are based on comparisons of the vertebrates with those of North American non-marine units, which are constrained by ammonite and palynological biozonations and calibrated by chronostratigraphical methods (Gradzinski et al., 1977, Fox, 1978, Lillegraven and McKenna, 1986, Jerzykiewicz and ...Description of new hadrosaurid fossils from the Upper Cretaceous Kakanaut Formation (Chukotka, Russia) and a study on their histology is published by Bapinaev et al. (2023), who interpret the studied fossils as …In this work, an assemblage of fossil woods briefly mentioned by Alvarez et al. (2019, 2020) from the Bajo Barreal Formation (Upper Cretaceous of the Golfo San Jorge Basin, in central Patagonia, Argentina) is described in detail, being the second study of woods from this stratigraphic unit, after that of Pujana et al. (2007).The hydrocarbon can also be generated from the Upper Cretaceous or Tertiary marine shale if they are buried in the deeper depression center (e.g., below thick turbidite fan), which migrates into the Upper Cretaceous and Tertiary reservoirs (especially the turbidite reservoir), and the seal is contemporaneous marine shale.First Upper Cretaceous dinosaur track assemblage from Jordan (Middle East) - preliminary results September 2020 Annales Societatis Geologorum Poloniae 90:331 - 342Abstract. Since 1983, only herbivorous dinosaurs and some isolated teeth of theropods have been described from the Upper Cretaceous of Shanxi Province, China. Here we report a new tyrannosauroid from the Upper Cretaceous of the province mainly based on a pair of maxillae and an associated dentary. This new dinosaur, named Jinbeisaurus wangi gen ...The Pierre Shale is a geologic formation or series in the Upper Cretaceous which occurs east of the Rocky Mountains in the Great Plains, from Pembina Valley in Canada [2] to …Udanoceratops belonged to the Ceratopsia (the name is derived Greek meaning 'horned face'), a group of herbivorous dinosaurs with parrot -like beaks which thrived in North America and Asia during the Cretaceous Period. [1] It is placed within the Leptoceratopsidae, as the only Asian representative at the time, along with the North …The ichnofossil assemblage from the Upper Cretaceous Kem Kem beds contributes evidence for a transition from predominantly terrestrial to marine deposition. Body fossil and ichnofossil records ...
Cretaceous deposits in the area have previously produced dinosaur fossils, and the Paleocene occasionally contains reworked Upper Cretaceous fossils. Based on observations of several short-lived, partial exposures in the greater vicinity (e.g., MMNS locality MS.73.030), a persistent phosphatic fossil assemblage occurs in the uppermost part of ...Find out information about Upper Cretaceous. The late epoch of the Cretaceous period of geologic time, beginning about 90 million years ago. McGraw-Hill Dictionary of Scientific …The Cretaceous formations of southwestern Arkansas consist largely of unconsolidated sand, clay, and marl, but include some beds of limestone, sandstone, and chalk. They rest on a pre-Cretaceous erosion surface, which is cut on folded and faulted Paleozoic rocks and dips to the south and southeast at about 100 feet per mile. The Cretaceous beds dip south and southeast from 65 to 80 feet per mile.A new articulated postcranial specimen of an indeterminate ankylosaurid dinosaur from the Upper Cretaceous (middle-upper Campanian) Baruungoyot Formation from Hermiin Tsav, southern Gobi Desert ...The Kem Kem beds in South Eastern Morocco contain a rich early Upper (or possibly late Lower) Cretaceous vertebrate assemblage. Fragmentary remains, predominantly teeth and jaw tips, represent several kinds of pterosaur although only one species, the ornithocheirid Coloborhynchus moroccensis, has been named.Here, we describe a new azhdarchid pterosaur, Alanqa saharica nov. gen. nov. sp., based ...
Aerotitan sudamericanus, from the Upper Cretaceous of the Neuquén Basin (Patagonia, Argentina), is known from a partial jaw fragment which has been interpreted as either an azhdarchid upper jaw, azhdarchid lower jaw, or thalassodromine upper jaw (as the sister-group of Alanqa).Here, we compare it in detail to upper and lower jaws of taxa belonging to all azhdarchoid lineages.Geology -- Maryland, Geology, Stratigraphic -- Cretaceous, Paleontology -- Cretaceous, Paleontology -- Maryland Publisher Baltimore, The Johns Hopkins press Collection cdl; americana Contributor University of California Libraries Language English Volume 2May 31, 2023 · Apatite U–Pb dating of dinosaur teeth from the Upper Cretaceous Nemegt Formation in the Gobi Desert, Mongolia: Contribution to depositional age constraints …
Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. The aim of the present paper is to devel. Possible cause: Cretaceous Period, in geologic time, the last of the three periods of the Me.
zonation came from the Upper Cretaceous sections cropping out in a series of small to large natural exposures, several quarries and three boreholes located in central, eastern and south-eastern Poland and western Ukraine (Figure1). In total, several hundred samples from 34 sections of the Upper Cretaceous of extra-Carpathian Poland and western ...The Upper Cretaceous Nenjiang lacustrine shale (K 2 n) is one of the most essential hydrocarbon source rocks in NE China with massive OM deposition across the Santonian-Campanian boundary interval, which can be correlated with the terminal stage of the last oceanic anoxic event in the Cretaceous, OAE3. This study focuses on the lower part of ...
The Cretaceous Maha Sarakham Formation in this area consists of evaporite units (Lower Salt and Middle/Upper Salt) interbedded with clastic sediment. Potash minerals in the upper part of the Lower Salt Unit are associated with an underlying thick bed of rock salt. The δ 11 B values of halite (21.46 ‰–32.62‰) indicated a marine origin ...We describe a new dromaeosaurid theropod from the Upper Cretaceous Wulansuhai Formation of Bayan Mandahu, Inner Mongolia. The new taxon, Linheraptor exquisitus gen. et sp. nov., is based on an exceptionally well-preserved, nearly complete skeleton. This specimen represents the fifth dromaeosaurid taxon recovered from the Upper Cretaceous Djadokhta Formation and its laterally equivalent strata ...
Geology and paleontology of the Upper Cretaceous Kem Kem Upper Cretaceous rocks reach a thickness of 2400m in the southern Ajdabiya Trough compared with 600m on the adjacent platforms. Because of its depth little is known about the northern part of the trough. The Ajdabiya Trough covers an area of 22,500km 2 and extends from the coast at Al Brayqah to the Kalanshiyu High in the south. South of the ... Upper Cretaceous. 1. Introduction. One oon Upper Cretaceous geological units using legacy industry 2-D seismic The upper Cretaceous Austin Chalk Group in south-central Texas, USA, displays vertical and lateral variations in thickness and facies resulting from an irregular paleotopography of the seafloor and variable preservation of 3 rd-order sea-level cycles.During the Coniacian to early Campanian, the tectonic evolution of the San Marcos Arch, a prominent basement feature in the study area, impacted ... Nevertheless, the Upper Cretaceous source rocks are most Upper Cretaceous-Palaeocene pelagic red beds in the North Atlantic basins (Fig. 1, Locality 1) (Jansa et al., 1979) are varicoloured, locally zeolitic, non-calcareous claystone.They form the Plantagenet Formation, which is a relatively thin, but widespread unit that overlies black claystone of the mid-Cretaceous Hatteras Formation (Jansa et al., 1979). Upper Cretaceous-Paleocene Magnetostratigraphy Thirty-four core shale samples from the Upper Cretaceous Mamu FormatThe Mesozoic extends over 187 million years f Upper boundary GSSP candidate section (s) None. The Jurassic ( / dʒʊˈræsɪk / juu-RASS-ik [2]) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period 201.4 million years ago (Mya) to the beginning of the Cretaceous Period, approximately 145 Mya. The Jurassic constitutes the middle period of the ... The Tanjero Formation is an Upper Cretaceous (Maastrichtian) unit, w Request PDF | On May 1, 2014, Lida Xing and others published Upper Cretaceous dinosaur track assemblages and a new theropod ichnotaxon from Anhui Province, eastern China | Find, read and cite all ...Ceratopsids are among the most ubiquitous dinosaur taxa from the Late Cretaceous terrestrial formations of the Western Interior of North America, comprising two subfamilies, Chasmosaurinae and Centrosaurinae. ... Dinosaur census reveals abundant tyrannosaurus and rare ontogenetic stages in the upper Cretaceous Hell Creek Formation ... Upper Cretaceous to Miocene; skull laterally flat[The intracontinental Benue Trough was initiated late Upper Cretaceous strata along a west-to-east transect from Virden Jun 1, 2023 · Dinosaurios Cretaceous tetrapods of Argentina; J.F. Bonaparte et al. Los saurópodos de América los grupos Neuquén y Chubut, y sus relaciones cronológicas; J.F. Bonaparte et al. A continental assemblage of tetrapods from the Upper Cretaceous beds of El Brete, northwestern Argentina (Sauropoda, Coelurosauria, Carnosauria, Aves)