Upper cretaceous.

Apr 1, 2023 · The Upper Cretaceous Qingshankou Formation in the Songliao Basin, NE China is known to contain excellent petroleum source rocks. In addition, it serves as a valuable record to study depositional conditions within the water column and climatic change. The Cretaceous as a separate period was first defined by Belgian geologist Jean d'Omalius d'Halloy in 1822, using strata in the Paris Basin and named for the extensive beds of chalk (calcium carbonate deposited by the shells of marine invertebrates, principally coccoliths), found in the upper Cretaceous of western Europe.The Cretaceous* saw the first appearance and initial diversification of flowering plants (Angiosperms). Insects and other organisms soon evolve to take advantage of the new food sources and opportunities these plants provide. Conifers continued replacing seed ferns, ginkgos and cycads. Marine life flourished, with many groups achieving their …Abstract. 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 ...Upper Cretaceous to Miocene; skull laterally flattened; choanae in depression in anterior part of pterygoids. Suborder Eusuchia Upper Jurassic to Recent; choanae entirely enclosed by pterygoids. Family Alligatoridae (alligators and caimans) 4 genera and 8 species; teeth of lower jaw fit inside those of upper jaw.

This upper Cretaceous source provides good oil source rocks in most parts of The Western Desert and moderate-quality gas source rocks in the Umbaraka area. Significant amounts of oil believed to have been generated from this source, are located in the Abu Gharadig and Gindi basins (Schlumberger 1995).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 ...

United States, showing areas mapped as Cretaceous stratified rocks on Geologic Map of United States ____ 52 16. United States, showing areas mapped as Mesozoic and Cenozoic plutonic and intrusive rocks on Geologic Map

Late Cretaceous palaeogeography of western North America was dominated by three tectonic belts that extended virtually the length of the Cordillera: (1) an Andean-type volcanic–plutonic magmatic arc on the west (i.e., Cordilleran Magmatic Arc), (2) a thin-skinned fold-and-thrust belt on the east (initiated in mid-Cretaceous time), and (3) a hinterland (zone of metamorphism, magmatism, and ...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 ...Nevertheless, the Upper Cretaceous source rocks are mostly matured, but its hydrocarbon generation is limited because of lower TOC (only 0.5-0.8%) and thinner thickness (only 10 m). The main effective source rock is the AG Group in the Lower Cretaceous, which is distributed throughout the area.Fixer-uppers offer lots of opportunities but come with some pitfalls. Fixer-uppers may typically be considered the domain of house flippers, but prospective homeowners are also getting into the game of buying and restoring properties in nee...

The alvarezsaurids are best known from the Upper Cretaceous of the Gobi Desert in Mongolia and northern China, although they are among the rarest theropod dinosaurs there. Even the fragmentary specimen PIN 5838/1, the holotype of Ondogurvel alifanovi described herein is among the most complete alvarezsaurid specimens known from the Gobi Desert.

Upper Cretaceous pelagic red carbonates which consist of limestone and muddy limestone within the Eastern Pontides, NE Turkey (Fig. 1). There, the red beds have a great lateral extent with remarkable lithology and thickness of up to 45 m, and are characterized by abun-

In the Japanese Upper Cretaceous, elasmosaurid remains are fairly common but two short-necked lineages are represented by much smaller number of specimens (e.g. Sato et al., 2012 Carrano et al ...The Upper Cretaceous ammonite Pseudaspidoceras Hyatt, 1903, in north-eastern Nigeria. Bulletin of The Natural History Museum, London, Geology Series, 51 (1995), pp. 53-72. View in Scopus Google Scholar. 50. P.M.P. Zaborski. The Upper Cretaceous ammonite Vascoceras Choffat, 1898, in north-eastern Nigeria.In the Zagros area and the Persian Gulf, Upper Cretaceous carbonate sequences are among the most important hydrocarbon reservoirs. In this study, facies analysis and stratigraphic interpretation of these sequences, Cenomanian-Santonian in age, have been carried out in subsurface sections from various parts of the Zagros area (including the Dezful Embayment and Fars Province) and the Persian ...Titanosaurs (or titanosaurians; members of the group Titanosauria) were a diverse group of sauropod dinosaurs, including genera from all seven continents.The titanosaurs were the last surviving group of long-necked sauropods, with taxa still thriving at the time of the extinction event at the end of the Cretaceous.This group includes some of the largest …In the Zagros area and the Persian Gulf, Upper Cretaceous carbonate sequences are among the most important hydrocarbon reservoirs. In this study, facies analysis and stratigraphic interpretation of these sequences, Cenomanian-Santonian in age, have been carried out in subsurface sections from various parts of the Zagros area (including the Dezful Embayment and Fars Province) and the Persian ...A sturgeon (Actinopterygii, Acipenseriformes) from the Upper Cretaceous of Africa. A single dorsal bony scute from the uppermost Cretaceous (Maastrichtian) marine phosphatites of central Morocco is identified as an acipenserid fish (sturgeon). The new specimen represents the first occurrence of an acipenseriform fish on the continent of Africa.

Great thicknesses of chalk were deposited during the Late Cretaceous, in water depths of 100 -500 m, when sea levels were higher than at any point in the Phanerozoic (Mortimore et al. 2001) and ...1. Introduction. The Cretaceous was warmer and wetter compared to the Jurassic, probably because the increase in atmospheric CO 2 and global changes in marine streams associated with the rupture of Pangea (Arthur et al., 1988; Berner, 1990; Spicer and Corfield, 1992; Price et al., 2013).This scenario favored the development and the diversification of the flora, even at high latitudes, where ...The upper boundary of the Cretaceous is sharply defined, being placed at an iridium-rich layer found worldwide that is believed to be associated with the Chicxulub impact crater, with its boundaries circumscribing parts of the Yucatán Peninsula and extending into the Gulf of Mexico. This layer has been dated at 66.043 Mya. Upper Cretaceous stratigraphy of the western Gulf Coast area, Mexico, Texas and Arkansas. Geological Society of America Memoir, 111, 139 p.Google Scholar. Reeside, J. B. Jr. 1927. The cephalopods of the Eagle sandstone and related formations in the western interior of the United States.Clay-rich deposits of Upper Cretaceous levels in the Taveiro (Reveles and S. Pedro) and Aveiro (Bustos) regions of west-central Portugal are economically and environmentally important, but detailed chemical and mineralogical characterization is lacking. The purpose of this study was to partially fill that gap by correlating the trace-element geochemistry (particularly the rare earth elements ...

Hence, Upper Cretaceous petroleum system dynamics is intimately linked to basin geodynamics; where hydrocarbon migration pathways could follow the migration, rotation and tilting of platform and basin blocks. The volume of Lower Fahden and Bahloul source rocks expelled hydrocarbons from the basin kitchens, is much greater than that found in the ...

The Upper Cretaceous (Campanian-Maastrichtian) forearc turbidites are up to 1,200 m thick and crop out in NW-SE trending elongate basins about 40 km wide, …The provenance of the Upper Cretaceous Nubia sandstones from four vertical sections along Qena-Safaga and Qena-Quseir roads in central Eastern Desert of Egypt was investigated based on their modal composition and geochemical data. The Nubia sandstone samples are abundant in quartz content with low feldspar and lithic fragments. Their average modal composition (Q94.2F1.3R4.5) classifies them as ...Type of Dinosaur: Theropod Existed: Late Cretaceous, 71-68 Mya Where found: Alberta, Canada Estimated length: 8-10 m (26-33 ft.) Albertosaurus was a member of the dinosaur family Tyrannosauridae (the same family to which T. rex and Gorgosaurus belong). The first Albertosaurus specimen to be found was a partial skull. It was …Our study builds on an earlier examination of the landscape abundance of megaherbivorous dinosaurs of the Upper Jurassic Morrison Formation of the western United States (Farlow et al., 2010), but now considers the abundance of Morrison large theropods, and extends consideration to the tyrannosaurids of the Upper Cretaceous Dinosaur Park ...Rare remains of tyrannosauroid dinosaurs from the Aguja Formation in West Texas indicate the presence here of a relatively gracile species, comparable in form and adult size to Appalachiosaurus or subadult albertosaurines, Gorgosaurus and Albertosaurus.Histologic analysis of one of the specimens indicates that the Aguja tyrannosaur attained an adult size substantially smaller than adult ...3.1 Cretaceous to Early Eocene. The Sabah basement rock mostly includes metamorphic, igneous, ultrabasic rock, and cherts (Chert-Spilite Formation) associated with ophiolite complex that formed during Early Cretaceous [].Based on the presence of ophiolites, Hutchison [] interpreted this unit as oceanic crust although some authors such as Reinhard and Wenk [] and Leong [] believe that the ...Deep-marine sedimentation occurred from the late Triassic to mid-Cretaceous (Aptian). Further to the west, near Xialu, Matsuoka et al. (2002) also sampled cherts from the Bainang terrane. They reported Middle Jurassic (Aalenian)–Lower Cretaceous (Aptian) assemblages extracted from cherts and siliceous mudstones. 3.6. Yamdrok Mélange

The upper part of the sequence has yielded Cretaceous benthic foraminifers (Rajashekhar 1991) and nannoplankton species Marthastenites furcatus of the Turonian age (Jafar 1982). The marine incursion in the Late Cretaceous is represented by small isolated outcrops of the Bagh Beds in the Dhar district, Madhya Pradesh (Fig. 15.15 ).

The Austin Group (Coniacian-Santonian) is a sequence of interstratified chalk and marl deposited during a sea-level highstand as a transgressive unit. Austin Chalk deposition occurred on a southeastward-dipping carbonate ramp that exhibits distinctive onshore and offshore chalk lithofacies. Discrete intervals within offshore Austin lithofacies ...

Maiasaura. Maiasaura (from the Greek μαῖα, meaning "good mother" and σαύρα, the feminine form of saurus, meaning "reptile") is a large herbivorous saurolophine hadrosaurid ("duck-billed") dinosaur genus that lived in the area currently covered by the state of Montana and the province of Alberta, Canada, [1] in the Upper Cretaceous ...Meniscoessus robustus – Named by Othniel Charles Marsh in 1889. Remains were discovered in Maastrichtian (Upper Cretaceous) and possibly Paleocene strata of Wyoming, Montana, and South Dakota, USA, and the St. Mary's River Formation of Canada. The weight of this species is estimated to have been about 3.3 kilograms (7.3 lb).Figure 2.6 Regional thickness maps [isochore, in feet]: for [A] entire Upper Cretaceous section, [B] Maastrichtian to Turonian, and [C] Turonian to base of Upper Cretaceous ..31 Figure 2.7 Structure maps, in feet, for [A] top of Upper Cretaceous [Late Maastrichtian],The Late Cretaceous experienced significant cooling, yet a lack of low-latitude records mean the regional extent of this cooling is poorly constrained. Linnert et al. present a TEX86sea surface ...The fossils were unearthed from the sandstone bed of the Upper Cretaceous Quantou Formation in Shanqian Village, Liufangzi Town, Gongzhuling City, Changchun Area, Jilin Province, China. Dromaeosaurids are small to medium-sized carnivorous dinosaurs, and they occur from the Early Cretaceous to the Late Cretaceous (Turner et al., 2012).The Bajo de la Carpa Formation is a geologic formation of the Neuquén Basin that crops out in northern Patagonia, in the provinces of Río Negro and Neuquén, Argentina.It is the oldest of two formations belonging to the Río Colorado Subgroup within the Neuquén Group.Formerly, that subgroup was treated as a formation, and the Bajo de la Carpa …Cretaceous Period. During this period, oceans formed as land shifted and broke out of one big supercontinent into smaller ones. Continents were on the move in the Cretaceous, busy remodeling the ...It is a subdivision of the Early or Lower Cretaceous Epoch or Series and encompasses the time from 121.4 ± 1.0 Ma to 113.0 ± 1.0 Ma (million years ago), approximately. The Aptian succeeds the Barremian and precedes the Albian, all part of the Lower/Early Cretaceous. The Aptian partly overlaps the upper part of the Western European Urgonian Stage.The Coniacian is an age or stage in the geologic timescale. It is a subdivision of the Late Cretaceous Epoch or Upper Cretaceous Series and spans the time between 89.8 ± 1 Ma and 86.3 ± 0.7 Ma (million years ago). The Coniacian is preceded by the Turonian and followed by the Santonian. [3]Horizon: Kem Kem Beds, Cenomanian, Upper Cretaceous (Sereno et al., 1996). The specimen was collected by G. Pasini (2008, personal communication) together with rostral teeth of the Aptian-Cenomanian elasmobranch Onchopristis sp. (Rage & Cappetta, 2002; Russell, 1996).

Description Restoration of the skull. Although perhaps little larger than a Virginia opossum, with a skull length of 12.2 centimetres (4.8 in) and a weight of 5.2 kilograms (11 lb), Didelphodon was the largest Cretaceous mammal. The teeth have specialized bladelike cusps and carnassial notches, indicating that the animal was a predator; the jaws are …The linkage between marine transgression and lacustrine source rock development has been highlighted for decades. Here, improved understandings were obtained on this challenging issue based on valuable comprehensive profiles from the Upper Cretaceous Songliao Basin, NE China (Qingshankou Formation, brief as K 2 qn 1). 48 shale samples from the Central Depression in the northern Songliao Basin ...Great thicknesses of chalk were deposited during the Late Cretaceous, in water depths of 100 -500 m, when sea levels were higher than at any point in the Phanerozoic (Mortimore et al. 2001) and ...The scientific paper describing the find—titled "Ancient diversity and turnover of cunninghamioid conifers (Cupressaceae): two new genera from the Upper Cretaceous of Hokkaido, Japan"—has been ...Instagram:https://instagram. goal setting in human resource managementgreat 8 basketballmap of.kansasgale business insights Echinodermata are rare in the Palaeozoic and Mesozoic of New Zealand. A carpoid is known from the Devonian, a cidarid (Echinoidea) from the Upper Triassic, an ophiuroid from the Upper Cretaceous, and asteroids from the Upper Jurassic and Upper Cretaceous. Good echinoid faunas are known from the Tertiary. euclidean pathkansas state baseball ranking Upper Cretaceous age of the sediments. Black shales are replaced by a pile of alternating reddish-brown, green, and gray-green noncalcareous clays (Cores 55-57); their thickness is about 80 meters. These deposits are characterized by scarce agglutinated foraminifers of the Upper Cretaceous—Plectina conversa, Recurvoides gerochi, Glomospira ...Upper Cretaceous basin-floor fans in the Voring Basin, Mid Norway shelf 1(53 They are interpreted as concentrated flow to turbidity flow deposits modified by a wave field appearing at the ambient water-flow interface during deposition, as is commonly observed for channel spillover deposits. However, reworking by deep-storm waves cannot be ... directions to o reilly auto parts Upper Cretaceous sections at the Tanama River are located on the Sigirte-Nado elevation, surrounded by the Tanama River from the west, north, and east (Fig. 3 B). The Tanama River is the left-bank tributary of the Yenisei River. It is located in the north-eastern part of the West Siberian sedimentary basin (e.g. Kontorovich et al., 2014).A recently discovered articulated partial skeleton of Ornithomimus from the Upper Cretaceous Dinosaur Park Formation of Alberta, Canada is remarkable in the extent and quality of preservation of integumentary structures including feathers. It is the first ornithomimid to preserve a tail bearing extensive plumaceous feathers that are slightly more elongate in comparison to those present on the ...