Upper cretaceous

The Cretaceous period was the last and longest segment of the Mesozoic era. It lasted approximately 79 million years, from the minor extinction event that closed the Jurassic period about 145 ...

1. Introduction. Ever since the Cretaceous System was first introduced, by the Belgian geologist Jean-Baptiste-Julien d'Omalius d'Halloy (1822), it has been arbitrarily divided into two or three series, i.e. lower and upper Cretaceous or lower, middle and upper Cretaceous, respectively, a situation that continues unabated today to the obvious detriment of clarity in stratigraphic communication.Dec 6, 2022 · The Upper Cretaceous to Paleogene sequences in the Middle East are characterized by regional anoxic black shale occurrences, enriched in different stratigraphic levels of various local basins (Abed et al., 2005; Almogi-Labin et al. 1990a, 1993; Ashckenazi-Polivoda et al., 2010, 2011; Holbourn et al., 1999; Inan et al., 2010). The studied black ... A new Podocnemidinura specimen from the Upper Cretaceous Bauru Group (Paraná Basin) of southeastern Brazil was described. The Bauru Group provided an important portrait of the Brazilian Mesozoic terrestrial biota, which boasts a vertebrate fauna formed from fishes, frogs, lacertilians, crocodyliforms, dinosaurs and mammals; records of palynomorphs; and invertebrate fauna consisted of ...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 Saratoga Chalk of Arkansas yields a rich ammonite fauna of 17 species, referred to the Nostoceras (N.) hyatti zone. Recognition that the northwest European N. (N.) pozaryskii Blaszkiewicz, 1980, is a synonym of N. (N.) hyatti Stephenson, 1941, and N. (N.) helicinum (Shumard, 1861) dates the zone as latest Campanian on the basis of co-occurrence with Belemnitella langei Jeletzky, 1948, in ...Background The validity of Nedoceratops hatcheri, a chasmosaurine ceratopsid dinosaur known from a single skull recovered in the Lance Formation of eastern Wyoming, U.S.A., has been debated for over a century. Some have argued that the taxon is an aberrant Triceratops, and most recently it was proposed that N. hatcheri represents an intermediate ontogenetic stage between "young adult" and ...

Nov 25, 2021 · A new ankylosaurid dinosaur, Tarchia tumanovae sp. nov., has been recovered from the Upper Cretaceous Nemegt Formation of Mongolia. It includes a well-preserved skull, dorsal, sacral, caudal ... Currently, the South American peirosaurids include nine taxa all the species found in Bauru Group. Pepesuchus deiseae Campos et al., 2011 was found in the meandering fluvial deposits from Presidente Prudente Formation, Upper Cretaceous (Campanian-Maastrichtian) near Pirapozinho and Presidente Prudente cities, São Paulo state, Brazil (Fernandes and Ribeiro, 2015).Ichthyosaurs from the Upper Triassic (Carnian–Norian) of the New Siberian Islands, Russian Arctic, and their implications for the evolution of the ichthyosaurian basicranium and vertebral column ... (Upper Cretaceous) of the Volga Region, Russia. Cretaceous Research 2020-06 | Journal article DOI: 10.1016/j.cretres.2020.104419 Part …Cenomanian Stage, first of six main divisions (in ascending order) in the Upper Cretaceous Series, representing rocks deposited worldwide during the Cenomanian Age, which occurred 100.5 million to 93.9 million years ago during the Cretaceous Period. Rocks of the Cenomanian Stage overlie those ofof the fossils. I recognized several well-known Upper Cretaceous species. (Matthes, 1933, p. 1007-1009.} A collection made from the oolitic clay in Janu­ ary 1933 by Willard Farrar of the Missouri Geological Survey and Water Resources showed that, in addition to the. Cretaceous fossils, the clay contained several

England. Extent. southern and eastern England. The Chalk Group (often just called the Chalk) is the lithostratigraphic unit (a certain number of rock strata) which contains the Upper Cretaceous limestone succession in southern and eastern England. The same or similar rock sequences occur across the wider northwest European chalk ' province '.the Upper Cretaceous on the North Slope. 5. Conclusions. 1 Late Cretaceous strata along the lower Colville River,. Alaska, record three distinct depositional ...Zangjiazhuang, Zhucheng City, Shandong Province (Fig. 1); Upper Cretaceous Wangshi Group (Hu et al., 2001).Within the fluvial sediments of the Wangshi Group, the abundant dinosaur material preserved in the Zhucheng quarries lies near the transition between the Xingezhuang Formation and the overlying Hongtuya Formation (Li et al., 2009).Basalt within the upper part of the Hongtuya Formation has ...Parksosaurus (meaning "William Parks's lizard") is a genus of neornithischian dinosaur from the early Maastrichtian-age Upper Cretaceous Horseshoe Canyon Formation of Alberta, Canada.It is based on most of a partially articulated skeleton and partial skull, showing it to have been a small, bipedal, herbivorous dinosaur. It is one of the few …The fossil record of Late Cretaceous non-hadrosaurid neornithischians from the Western Interior of North America is sparse. Parksosaurus warreni is an early Maastrichtian taxon currently known only from a skull and much of the associated postcranial skeleton and a referred isolated tooth from the Horseshoe Canyon Formation of Alberta, Canada. This article presents a detailed anatomical account ...

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Enantiornithes were the dominant avialan clade in the Mesozoic. However, their record for the Upper Cretaceous is scarce. In this study, we present and describe Yatenavis ieujensis gen. et sp. nov., one of the youngest occurrence of an enantiornithine bird. The specimen, the distal half of a right humerus, was found in Chorrillo Formation ...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 ...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 ...Japanese Upper Cretaceous marine reptile fossils occur in five major stratigraphical units: the Yezo, Kuji, Futaba, Izumi, and Goshoura groups (Figs. 1and 2; Table 1). Many of these specimens were excavated by private collectors and donated to local museums; therefore, their locality data is based solely on museum records and/or published ...Sea level was higher during most of the Cretaceous than at any other time in Earth history, and it was a major factor influencing the paleogeography of the period. In general, world oceans were about 100 to 200 metres (330 to 660 feet) higher in the Early Cretaceous and roughly 200 to 250 metres (660 to 820 feet) higher in the Late Cretaceous than at present.

The specimen was discovered in the Upper Cretaceous strata of the Huincul Formation (middle Cenomanian-lower Turonian). It includes appendicular and relatively slender elements, with a femoral total length of about 1.9 m long. This taxon shows a unique combination of characters indicating that appendicular bones such as the femur, ischium and ...Sep 21, 2023 · Introduction. The Upper Cretaceous Nanxiong Formation of Jiangxi Province, southern China has yielded a diverse array of vertebrates in recent years, including theropods (Xu and Han Citation 2010; Wang et al. Citation 2013; Wei et al. Citation 2013; Lü et al. Citation 2013a, Citation 2014, Citation 2015, Citation 2016, Citation 2017; Mo and Xu Citation 2015), ornithopods (Xing et al. Citation ... The Upper Cretaceous-Upper Eocene Belaga Formation is characterized by thick deep-water sediments that were accumulated as one of the biggest ancient submarine fans covering a time interval of 30 Ma. Although the Belaga Formation is the extensively investigated formation in the Rajang Group, its source and tectonic setting are still arguable. ...The Turonian is, in the ICS' geologic timescale, the second age in the Late Cretaceous Epoch, or a stage in the Upper Cretaceous Series.It spans the time between 93.9 ± 0.8 Ma and 89.8 ± 1 Ma (million years ago). The Turonian is preceded by the Cenomanian Stage and underlies the Coniacian Stage.. At the beginning of the Turonian an oceanic anoxic …Figure 6.25 The distribution of the Upper Cretaceous Nanaimo Group rocks on Vancouver Island, the Gulf Islands, and in the Vancouver area. The Nanaimo Group is divided into 11 formations as described in Table 6.4. In general, the boundaries between formations are based on major lithological differences. As can be seen in the far-right column of ...Jul 26, 2022 · The Cretaceous period was the last and longest segment of the Mesozoic era. It lasted approximately 79 million years, from the minor extinction event that closed the Jurassic period about 145 ... Preliminary study of a diverse dinosaur assemblage from the Upper Cretaceous of Zhuzhou, Hunan Province. Acta Palaeontol Sin. 56:1-9. [Google Scholar] Han FL, Xu X, Sullivan C, Huang LQ, Guo Y, Wu R. 2019. New titanosauriform (Dinosauria: sauropoda) specimens from the Upper Cretaceous daijiaping Formation of southern China. Peer J.2001 Bones and rocks of the Upper Cretaceous Two Medicine-Judith River clastic wedge complex, Montana. In Field Trip Guidebook, Society of Vertebrate Paleontology 61st Annual Meeting: Mesozoic and Cenozoic Paleontology in the Western Plains and Rocky Mountains (ed CL Hill ), vol. 3, pp. 3-14. Museum of the Rockies Occasional Paper.Cretaceous: A Time of Chalk. Much chalk was deposited during the Cretaceous Period of geologic time. It was a time of global high sea levels that began at the end of the Jurassic Period about 145 million years ago and the beginning of the Paleogene Period about 66 million years ago. ... Upper Cretaceous Austin Chalk, U.S. Gulf Coast: by Krystal ...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.Isolated bones of abelisauroid theropods from the Baum Group (Upper Cretaceous, Brazil), are described. They correspond to three individuals represented by fused ischia and part of the ilium, a ...The Upper Jurassic-Lower Cretaceous nonmarine rocks of the study area contain three depositional sequences. The first of these, the UJ-1 sequence, consists primarily of an aggradational systems ...

More information: Brian A. Atkinson et al, Ancient diversity and turnover of cunninghamioid conifers (Cupressaceae): two new genera from the Upper Cretaceous …

Buying a new home is one of the most rewarding things you can do. And then comes the work — more than you think if you've bought a "fixer-upper." Make sure you ask the right questions to make sure the work is worth it. The DIY experts at St...Tröger K-A (1989) Problems of Upper Cretaceous inoceramid biostratigraphy and paleobiogeography in Europe and western Asia. In: Wiedmann J (ed) Cretaceous of the Western Tethys. Proceedings of the 3rd International Cretaceous Symposium Tübingen 1987. Schweizerbart, Stuttgart. Google Scholar Wani R, Gupta NS (2015) Ammonoid …The regional Cretaceous structural and isopach/lithofacies maps of the Middle East provide a unique overview of the major tectonic and stratigraphic developments in the leading petroleum basin of the World. The structural map of the Near Top Cretaceous and the Upper Cretaceous isopach show that most of the tectonic elements of the region ...Appalachia (landmass) During most of the Late Cretaceous (100.5 to 66 million years ago) the eastern half of North America formed Appalachia (named for the Appalachian Mountains ), an island land mass separated from Laramidia to the west by the Western Interior Seaway. This seaway had split North America into two massive landmasses due to a ...The organic-rich shale of the Upper Cretaceous Qingshankou Formation is an important hydrocarbon source rock in Northeast China. In this study, taking the lacustrine shale in the Qingshankou Formation as an example, geochemical analysis, including total organic carbon (TOC), Rock-Eval pyrolysis, maceral compositions, X-ray diffraction (XRD), and biomarker analyses, were carried out on twenty ...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 ...The Upper Cretaceous stratigraphic section has been subdivided into the Quantou, Qingshankou, Yaojia, Nenjiang, Sifangtai and Mingshui formations in ascending order. Late Cretaceous microfossils are diverse and abundant. A detailed biostratigraphic study has subdivided the sequence into high precision biozones: 21 ostracode assemblages, 10 ...First paleosol-derived climate data from continental Africa for the mid/Late Cretaceous. • Multi-proxy analysis using morphology, bulk geochemistry and δ 18 O of carbonates.. Lower-Upper Cretaceous paleosols record temperate conditions in Africa.

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of the fossils. I recognized several well-known Upper Cretaceous species. (Matthes, 1933, p. 1007-1009.} A collection made from the oolitic clay in Janu­ ary 1933 by Willard Farrar of the Missouri Geological Survey and Water Resources showed that, in addition to the. Cretaceous fossils, the clay contained severalIn this study, we report the occurrence of 3β-methylhopane homologues with carbon numbers up to C 45 in terrigenous source rocks from the first member of the Upper Cretaceous Qingshankou Formation, Songliao Basin, northeast China, with a preliminary assessment of their potential sources assisted by stable carbon isotopic measurements. 2.Titanosaurian Sauropod from the Upper Cretaceous of Jiangxi Pr ovince, Southern China, Historical Biology, DOI: 10.1080/08912963.2023.2259413 To link to this article: https://doi.or g/10.1080 ...Upper Cretaceous and Lower Cretaceous aquifers are transboundary aquifers which extend outside the political east boundary of Egypt to Negev, in Palestine (Issar et al. 1972; Nour 1998). The Upper Cretaceous limestone and the Lower Cretaceous sandstone aquifers extend in central and northern Sinai and are the main source of water …Field investigation, Microfacies analysis, and biostratigraphy have been carried out in the central parts of the Ionian Basin (Aetoloakarnania area, Western Greece) in order to decipher the depositional environments that developed during the accumulation of the Upper Cretaceous to Eocene carbonate succession. Three different Standard Microfacies types (SMF) have been observed, corresponding to ...In the early Cretaceous, many of the southern continents were still joined together as part of the southern landmass called Gondwana. Northern continents formed the great landmass Laurasia. ... Goannas evolved in the northern hemisphere in the Upper Cretaceous Period about 90 million years ago. Discover more. Australia through time.Additional resources. The Cretaceous period was the last and longest segment of the Mesozoic era. It lasted approximately 79 million years, from the minor extinction event that closed the Jurassic ...A limited exposure of Upper Cretaceous marine siltstones and claystones near the coastal town of Carlsbad, California, contains a remarkably well-preserved ...Upper Cretaceous dinosaur remains from Afro-Arabia are rare and mainly restricted to pre-Turonian horizons. Consequently, the discovery of new fossils from Upper Cretaceous deposits in the Western Desert, central Egypt is significant because it adds to the meager record of dinosaurs described from this landmass. ….

The Upper Cretaceous limestones are abundantly fossiliferous with a moderately diverse fauna: in fact, the assemblages are usually mono- or oligospecific. From the analysis of the lithofacies, little differentiated physiographic zones can be hypothesized. On shelves like these, also the ecological niches are usually few because conditions are ...Tyrannosaurus rex arose during the Cretaceous period about 85 million years ago, and thrived as a top land predator until the dinosaurs went extinct 20 million years later. This skeleton, on ... Upper Cretaceous of California 235 Within California, but outside of the Chico Formation, the strat~graphic disv~ bution of Baculites capensis is poorly understood. As discussed earlier, the ranges of H. venustum and Baculites capensis overlap slightly on Mill Creek and Big Chico Creek. Collections from the Redding area, specifically UCLA ...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...Upper left side back pain can be caused by acute pancreatitis, Healthline says. Although the pain manifests mostly in the upper left side of the abdomen, it can spread to the left side of the back and left shoulder blade.Prince Creek Formation. / 70.0; -151.5. / 83.2; -115.9. The Prince Creek Formation is a geological formation in Alaska with strata dating to the Early Maastrichtian stage of the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.The Upper Cretaceous aquifer of Cretaceous age is a regionally extensive but relatively little-used aquifer in the northern Mississippi embayment. Throughout much of its area of occurrence, this aquifer is the deepest freshwater source available. Because it is commonly overlain by high-Jan 20, 2018 · Geography. Approximately the upper Cretaceous occupies in north central Kansas an area of twenty five thousand square miles-nearly one third of the total area of the state. The main portion of this area lies between the 38th and 40th parallels north latitude and the 97th and 100th degrees 30 minutes west longitude. Apr 21, 2020 · 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 ... Upper cretaceous, [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1]