Upper cretaceous.

Background Dinosaur eggs containing embryos are rare, limiting our understanding of dinosaur development. Recently, a clutch of subspherical dinosaur eggs was discovered while blasting for a construction project in the Upper Cretaceous red beds (Hekou Formation) of the Ganzhou Basin, Jiangxi Province, China. At least two of the eggs contain identifiable hadrosauroid embryos, described here for ...The fossil record for neoceratopsian (horned) dinosaurs in the Lower Cretaceous of North America primarily comprises isolated teeth and postcrania of limited taxonomic resolution, hampering previous efforts to reconstruct the early evolution of this group in North America. An associated cranium and lower jaw from the Cloverly Formation (?middle-late Albian, between 104 and 109 million years ...Dec 1, 2021 · The Nenjiang Formation is part of the post-rift thermal subsidence section of the Songliao Basin that contains a nearly complete record of upper Lower Cretaceous to lower Paleocene lacustrine sediments in the basin centre (Deng et al., 2013, Feng et al., 2010, Wang et al., 2013). Einiosaurus is a genus of herbivorous centrosaurine ceratopsian dinosaur from the Upper Cretaceous (Campanian stage) of northwestern Montana.The name means 'bison lizard', in a combination of Blackfeet Indian eini and Latinized Ancient Greek sauros; the specific name (procurvicornis) means 'with a forward-curving horn' in Latin. Einiosaurus is medium …

The Upper Jurassic succession contains the Baicheng Fm. The Huoshiling, Shahezi, Yingcheng, Denglouku, and Quantou Fms compose the Lower Cretaceous section; and Upper Cretaceous strata include the Qingshankou (K 2 qn), Yaojia, Nenjiang (K 2 n), Sifangtai, and Mingshui Fms (Gao and Cai, 1997).. The sediments of K 2 qn and K 2 n were deposited in a semideep lake during global sea level rise (Liu ...The only turtle closest to this size from the Upper Cretaceous of China is Nanhsiungchelys wuchingensis of Nanhsiungchelyidae, in which the carapace length is larger than 111 cm. However, this large turtle was recovered from Nanxiong County, Guangdong Province (Ye, 1966; Tong and Li, 2019).The Upper Cretaceous Chalk Group of the Anglo-Paris Basin is known to show wedging beds and channel-like features which disrupt the quietly deposited pelagic chalk that covered most of NW Europe ...

The Upper Cretaceous petroleum system of the East Beni Suef Basin, Egypt: an integrated geological and 2D basin modelling approach. Characterization of silicification and dissolution zones by integrating borehole image logs and core samples: a case study of a well from the Brazilian pre-salt. Seismic stratigraphy of the southern Eratosthenes ...

The Upper Cretaceous strata are either devoid of microfauna or contain few agglutinated taxa suggestive of continental to brackish water settings. The development of calcareous benthic foraminiferal assemblages in Paleogene strata of the study area signaled the incursion of open marine neritic conditions. Influx of sandy sediments at some ...The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous period is divided in the geologic timescale. Rock strata from this epoch form the Upper Cretaceous series. The Cretaceous is named after the white limestone known as chalk which occurs widely in northern France and is famously seen in the white cliffs of ...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.Apr 2, 2021 · The origin of modern rainforests can be traced to the aftermath of the bolide impact at the end of the Cretaceous. Carvalho et al. used fossilized pollen and leaves to characterize the changes that took place in northern South American forests at this time (see the Perspective by Jacobs and Currano). They not only found changes in species ...

The Cretaceous Galula Formation is further subdivided into lower (Mtuka) and upper (Namba) members and consists entirely of non-marine deposits, including alluvial, fluvial and lacustrine mudstones, siltstones and sandstones (Fig. 1) (Roberts et al., 2010).The Mtuka Member comprises abundant conglomerates and coarse sandstones, …

Only two Cretaceous source rocks exist in the NRB, the Upper Cretaceous Donga and the Upper Cretaceous Yogou source rocks. The source rock of the Yogou Formation is the most prolific in the entire NRB and has basin-wide distribution (Zhou et al., 2017; Xiao et al., 2019). The Donga Formation is predominantly Type III kerogen of very poor to ...

Amiot, R. et al. Latitudinal temperature gradient during the Cretaceous Upper Campanian-Middle Maastrichtian: δ18O record of continental vertebrates. Earth Planet. Sci. Lett. 226, 255-272 (2004).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 ...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, extending along the central and eastern Pontides. We present new detrital zircon U-Pb ages, petrography, and paleocurrent measurements from the Campanian-Maastrichtian turbidites and ...These successions correspond to four distinct tectono-sedimentary phases, from older to younger forming the Upper Paleozoic Karoo Supergroup, the Cretaceous Galula Formation, the Oligocene Nsungwe Formation and the Miocene-Recent Lake Beds strata (Roberts et al., 2012) (Fig. 1).

Thorough sedimentological and palaeontological analyses of four expanded Upper Cretaceous sections in northern Tademait had allowed us to address and reconsider the stratigraphical framework of the so-called 'Continental Intercalary' and 'Hamada series' in this remote Saharan area. These four sections (i.e., Meguidene, ...The Late Cretaceous (100.5-66 Ma) is the younger of two epochs into which the Cretaceous period is divided in the geologic timescale. Rock strata from this epoch form the Upper Cretaceous series. The Cretaceous is named after the white limestone known as chalk which occurs widely in northern France and is famously seen in the white cliffs of ...The Cretaceous Continental Scientific Drilling borehole in the Jiaolai Basin (CCSD-LK-I) provides rare samples from the Upper Cretaceous and Paleocene terrestrial strata. This study aims to establish a chronostratigraphical framework for the terrestrial strata of the Jiaolai Basin by integrating magnetostratigraphy and isotope geochronology.The Upper Cretaceous foraminifera of Kemar-1 in the Bornu Basin are dominated by arenaceous foraminifera, including Ammobaculites, Haplophragmoides, etc (Adegoke, 2012). Large numbers of arenaceous foraminifera were found in Upper Cretaceous outcrop of the Benue Trough, including Glomospirella , Miliammina , Haplophragmoides , Ammoastuta ...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 '.Apatite U-Pb dating of dinosaur teeth from the Upper Cretaceous Nemegt Formation in the Gobi Desert, Mongolia: Contribution to depositional age constraints. Myu Tanabe, ... our data supports the deposition of the middle-upper Nemegt Formation during the Maastrichtian stage. Given that the depositional age of the Nemegt Formation has not ...

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 ...

The Hell Creek Formation is an intensively studied geological formation of mostly Upper Cretaceous and some Early Paleocene rocks in North America, named for exposures studied along Hell Creek, near Jordan, Montana. The formation stretches over portions of Montana, North Dakota, South Dakota, and Wyoming. In Montana, the Hell Creek Formation ...The presence of a small to middle-medium sized abelisaurid in the Upper Cretaceous shows that. Author statement. We the authors of "A New Medium-sized Abelisaurid (Theropoda, Dinosauria) from the late Cretaceous (Maastrichtian) Allen Formation of Northern Patagonia, Argentina." declare that have not submitted this article in another journal ...The Upper Cretaceous in Texas is a proven prolific hydrocarbon system. The “Eaglebine” in Central Texas, which includes both the Eagle Ford and Woodbine intervals, is an emerging play with promising results. However, stratigraphic architecture in this region is poorly understood when compared to that of the Maverick Basin and East Texas Basin.A new Cretaceous ootaxon (eggshell type) from the Kaiparowits Formation of Grand Staircase-Escalante National Monument is among a growing number of very small eggs described from the Mesozoic.Robert G. Loucks, Toti E. Larson, Charlie Y. C. Zheng, Christopher K. Zahm, Lucy T. Ko, James E. Sivil, Peng Sheng, Stephen C. Ruppel, William A. Ambrose; Geologic characterization of the type cored section for the Upper Cretaceous Austin Chalk Group in southern Texas: A combination fractured and unconventional reservoir.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 ...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 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'. It is characterised by thick deposits of chalk, a soft porous white limestone, deposited in a marine ...

The Upper Cretaceous Postalm section in the Northern Calcareous Alps (Austria) exposes pelagic deposits of the northwestern Tethys whose cyclostratigraphy and palaeoenvironments were examined in this study. The section displays rhythmic deposits of Santonian to late Campanian age (Gosau Group). The Santonian/Campanian transition is ...

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 bone-beds of the Upper Cretaceous Wangshi Group in Zhucheng, Shandong, China are rich in fossil remains of the gigantic hadrosaurid Shantungosaurus. Here we report a new oviraptorosaur ...Age, Correlation, and Lithostratigraphic Revision of the Upper Cretaceous (Campanian) Judith River Formation in Its Type Area (North-Central Montana), with a Comparison of Low- and High-Accommodation Alluvial Records. The …Pore and pore network evolution of Upper Cretaceous Boquillas (Eagle Ford-equivalent) mudrocks: Results from gold tube pyrolysis experiments AAPG Bulletin. Modeling the effects of microscale fabric complexity on the anisotropy of the Eagle Ford Shale Interpretation ...tions of Early Cretaceous age and thirteen of Late Cretaceous age. The thickness of the entire Cretaceous section ranges between about 3,500 ft and 5,600 ft; within this range between 500 and 1,000 ft are Lower Cretaceous and the remainder are Upper Cretaceous. The entire section is thickest on the west, and thins eastward (Dyman and others, 1995).The European Upper Cretaceous deposits have yielded an abundant record of dinosaurs and other continental vertebrates with a great number of sites discovered in the last decades (e.g., [1,2,3,4,5,6,7,8]).In this context, particularly relevant are the sedimentary units of the Ibero-Armorican domain, mainly distributed in the Lusitanian (Portugal), Iberian (central Spain), Pyrenees (north ...The Cretaceous Continental Scientific Drilling borehole in the Songliao Basin (CCSD-SK-I) (Wang et al., 2008, Wang et al., 2012, Feng et al., 2012), which consists of two borehole cores (that is, the north core and the south core) (Fig. 1 A), offers a unique opportunity for probing into the nature of the terrestrial Cretaceous world.This study aims to establish a chronostratigraphical ...A new megaraptoran theropod dinosaur from the Upper Cretaceous Bajo de la Carpa Formation of northwestern Patagonia. Cret. Res. …from 34 sections of the Upper Cretaceous of extra-Carpathian Poland and western Ukraine (Figure 1) were analysed by us. In addition to the re-evaluation of the previously studied.Tectonism during the early Cretaceous in western North America resulted in the development of a foreland basin and formation of the Western Interior Seaway (e.g. Burchfiel et al., 1992). By Maastrichtian times, this epeiric sea linked the polar ocean and the subtropical Gulf of Mexico . The Upper Cretaceous succession currently exposed in the ...

In open-marine accumulations, a peculiarly common mode of occurrence within Upper Cretaceous hemipelagic (marly chalk) facies of southeastern states, simple floatation of a dinosaurian cadaver into deep-water shelfal areas is the only mechanism involved (Figure 3c; Langston, 1960; Schwimmer, 1996). Such a cadaver, dried on its top side and ...A new Cretaceous ootaxon (eggshell type) from the Kaiparowits Formation of Grand Staircase-Escalante National Monument is among a growing number of very small eggs described from the Mesozoic.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 …Despite the abundant literature on limnic Cretaceous ostracode faunas, the database on mid-Late Cretaceous taxa is still scarce. The Songliao Basin in northeastern China preserves a diverse assemblage of ostracode fossils from the Santonian-Campanian Nenjiang and Sifangtai formations.Instagram:https://instagram. scott kullprofessional softball draft 2023what channel will the byu game be oncomo se escribe dos mil en numeros 10 de set. de 2021 ... Reference: “A Late Cretaceous dinosaur and crocodyliform faunal association–based on isolate teeth and osteoderms–at Cerro Fortaleza Formation ( ...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. kansas state 2023 football scheduleverified course sequence 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 ...The paleobiology of the Cretaceous neoselachian shark,Squalicorax, has largely been based on isolated teeth. We examined partial and nearly complete skeletons of three species ofSqualicorax, S. falcatus (Aoassiz),S. kaupi (Agassiz), andS. pristodontus (Agassiz), that were collected from the U.S.A. These specimens suggest that the total body length (TL) ofS. falcatus typically measured 1.8-2. ... being assertive means being The Upper Cretaceous deposits in this basin are divided into the Gaogou, Majiacun and Sigou formations in ascending order (Pan et al., 2008). The fossil eggs studied here were recovered from the Gaogou Formation (Fig. 1), formerly the Xiaguan Formation in previous works (Liang et al., 2009; Zheng et al., 2015; Jackson et al., 2018). Due to ...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 ...