Upper cretaceous

Laocoetis piserai n. sp. (Hexactinellida, Porifera) from the mid-Cretaceous (i.e., Albian–Cenomanian) of James Ross Island is the first record of a fossil sponge from Antarctica. This new occurrence of a formerly widespread genus was restricted to relatively deep waters on the margins of an active volcanic arc.

The Upper Cretaceous (Turonian) Akrabou Formation at Asfla in south east Morocco is a marine carbonate succession well-known for its exceptionally preserved, often three-dimensional marine vertebrate fossils.It is perhaps best known for its diverse ichthyological assemblage comprising both cartilaginous and bony fishes, notably …The Upper Cretaceous-Eocene succession in the study area begins with the Bahi Formation, the lower part of which is comparable to the pre-Upper Cretaceous Nubian facies in having been deposited mainly under a non-marine regressive phase, as indicated by the absence of dinocysts and microforaminiferal test linings. By contrast, the upper part ...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 ...The presence of Hedycaryoxylon in several Upper Cretaceous Antarctic localities indicates the continuation of the icacinoid type of fossil wood, one of the two types prevailing in the middle Cretaceous (Wheeler & Lehman, 2009), extending into high latitudes to the early Campanian. Similarities to extant wood.CONTENTS. Preface. Sequence Stratigraphy of the Upper Cretaceous (Cenomanian) Woodbine Group: Chronostratigraphic Integration of the East Texas Basin and East Texas Field, by Tucker F. Hentz and Florence Bonnaffé. Depositional Systems and Facies Variability in Highstand Fluvial- Dominated Deltaic and Lowstand Valley-Fill Systems in the Lower ...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).Download scientific diagram | Upper Cretaceous surface exposures in Alabama and Cretalamna bryanti sp. nov. specimen collecting localities. Scale bars equal 20 km. Full-size DOI: 10.7717/peerj ...The Cenomanian is, in the ICS ' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series. [4] An age is a unit of geochronology; it is a unit of time; the stage is a unit in the stratigraphic column deposited during the corresponding age.

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.Despite this, species of carcharodontosaurians have been recovered from two lower Upper Cretaceous formations (Cenomanian and Turonian) of Asiamerica and include large taxa [5,6]. As the apex predators in these early Late Cretaceous ecosystems, their faunal associations with other predators, particularly tyrannosauroids, are poorly known.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 ...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).Apr 15, 2014 · 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 Upper Jurassic-Lower Cretaceous strata, known as the Shamuluo or Rina Formation, overlying the subduction-accretionary complex, is a terrigenous clastic-carbonate rocks over 800 m thick, and contains Spongiomorpha sp., corals, sponges, ammonites, and foraminifera and plant fossils, and the gravels which consists of basic-ultrabasic rocks ...

The study area consists of sediment packages deposited within the Upper Cretaceous sequence of the Anambra Basin, in the south-eastern part of Nigeria (Fig. 1). The Anambra Basin is situated at the western flank of the Southern Benue Trough, bounded to the west by the Precambrian Basement Complex rocks of western Nigeria, to the east by the ...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 ...Large carnivorous dinosaurs, are common in the Late Cretaceous of Asia, but only some fragment teeth have been recovered from southern China. In a paper published in the latest issue of Vertebrata ...The Cretaceous period has just two very long epochs: Upper Cretaceous 100.5 million years ago (mya) to 65 mya; Lower Cretaceous 145.5 mya to 100.5 mya. The Lower Cretaceous at ~45 million years, is the longest epoch in the Phanerozoic eon. Though famous for its land fauna, the Cretaceous sea level rose much higher than today.

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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 ...Prior to the discovery of Pyroraptor, only indeterminate Late Cretaceous dromaeosaurid material had been known in Europe (Allain and Taquet, 2000) from elsewhere in France (Buffetaut et al., 1986 ...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 ...The Williams Fork Formation (Upper Cretaceous) is exposed in northwestern Colorado and is part of the "Mesaverde Group" in this area, which appears to be slightly younger than the type Mesaverde ...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 ...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 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 ...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 ...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 ...Hunt, C.O. 1987. Dinoflagellate cyst and acritarch assemblages in shallow-marine and marginal-marine carbonates: the Portland Sand, Portland Stone, and Purbeck Formations (Upper Jurassic/Lower Cretaceous) of southern England and northern France. In: Hart, M.B. (ed) Micropalaeontology of Carbonate Environments.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 mid-to Upper Cretaceous forearc basin deposits of the Yezo Group are widely distributed in central Hokkaido, Japan and western Sakhalin, Russian Far East (Fig. 1A, B; Matsumoto, 1954; Okada, 1983; Takashima et al., 2004; Shigeta and Maeda, 2005). This group shows significant lateral facies changes, and different stratigraphic divisions have ...The Bellezma-Batna Mountains of northeast Algeria mainly consist of Jurassic-Cretaceous platform carbonate deposits (Marmi, 1995 ), forming the eastern part of the …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 ...

Ages of the Upper Cretaceous strata are well established from radiometric dating and from marine layers of the fossiliferous Mancos Group, which is as much as a mile thick in eastern Utah. Farther north, the North Horn …

Ages of the Upper Cretaceous strata are well established from radiometric dating and from marine layers of the fossiliferous Mancos Group, which is as much as a mile thick in eastern Utah. Farther north, the North Horn Formation of central Utah contains dinosaurs such as Tyrannosaurus and Torosaurus that lived about 65 million years ago, at the ...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 2010 ; Wang et al. 2013 ; WeiDinosaurs from the Upper Cretaceous period in the western United States. Artwork showing the following dinosaurs (from left) Pachycephalosaurus, ...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 ...Cretaceous Period in geologic time. Campanian Stage, fifth of six main divisions (in ascending order) in the Upper Cretaceous Series, representing rocks deposited worldwide during the Campanian Age, which occurred 83.6 million to 72.1 million years ago during the Cretaceous Period. Rocks of the Campanian Stage overlie those of the Santonian ... We divide Upper Jurassic–Lower Cretaceous strata of the broadly defined Bisbee basin into five regionally correlative tectonostratigraphic assemblages (TSAs; Fig. 2). Tectonostratigraphic assemblages “record phases of basin history during which the fundamental controls of tectonic setting, subsidence style, and basin geometry are relatively ...Joshua W. Bonde, Rebecca L. Hall, L. J. Krumenacker, and David J. Varricchio "Nevadadromeus schmitti (gen. et sp. nov.), a New Basal Neornithischian with Affinities to the Thescelosaurinae, from the Upper Cretaceous (Cenomanian) Willow Tank Formation of Southern Nevada," Journal of the Arizona-Nevada Academy of Science 50(1), 1-8, (14 October ...The Kuji Group is an Upper Cretaceous non-marine and shallow marine sedimentary succession that is exposed on the eastern margin of northeastern Honshu Island, Japan (Fig. 1). The Kuji Group overlies the pre-Cretaceous accretionary complex and the Lower Cretaceous granitoids, and is overlain by the Paleogene Noda Group with parallel ...1991. There are described several types of Upper Cretaceous fossil amniote eggs, clutches and eggshells, collected during the Polish-Mongolian Paleontological.

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Here we report on, and briefly describe, two new sauropod dinosaur specimens from the Cenomanian-lower Turonian (lower Upper Cretaceous) Winton Formation of Queensland, northeast Australia (Figs ...Fluvial deposits of the Kaiparowits Formation at "The Blues". The Kaiparowits Formation is a sedimentary rock formation found in the Kaiparowits Plateau in Grand Staircase–Escalante National Monument, in the southern part of Utah in the western United States.It is over 2800 feet (850 m) thick, and is Campanian in age. This Upper …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 ...During the last three decades, several basal ceratopsians have been unearthed in Upper Jurassic and Lower Cretaceous strata in Asia and North America, including Yinlong downsi 1, Chaoyangsaurus ...The Upper Cretaceous post-rift Cotiella Basin exposes exceptionally preserved kilometer thick sedimentary succession of seismic-scale MBs and the salt-structures flanking strata. In order to analyses the impact of a growing salt structure on facies distribution, stratal pattern, and thickness trends, this investigation focuses on the ...Request PDF | On Apr 1, 2023, Roman A. Bapinaev and others published New data on high-latitude hadrosaurid dinosaurs from the Upper Cretaceous Kakanaut Formation of Chukotka, Russia | Find, read ...The meaning of CRETACEOUS is of, relating to, or being the last period of the Mesozoic era characterized by continued dominance of reptiles, emergent dominance of angiosperms, diversification of mammals, and the extinction of many types of organisms at the close of the period; also : of, relating to, or being the corresponding system of rocks.The Cretaceous (IPA: / k r ɪ ˈ t eɪ ʃ ə s / krih-TAY-shəs) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest.At around 79 million years, it is the longest geological period of the entire Phanerozoic.The name is derived from the Latin creta, "chalk", which is abundant in the latter ...Upper Cretaceous to Paleogene nonmarine sedimentary rocks of southwest Utah record Sevier foreland basin sedimentation, Laramide-style folding and intermontane sedimentation, and cessation of Laramide deformation. The formations that record this tectonic evolution arc, from oldest to youngest, the Iron Springs, Kaiparowits, Canaan Peak, Grand ...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). ….

A complete Cretaceous-Paleogene stratigraphy is developed within the Longmenshan foreland basin, ... Solid/open symbols are lower/upper hemisphere projections. There are several differences in the thermal demagnetization characteristics of the samples with different lithologies and colors. For the purplish-red and brownish-red sandstones ...Request PDF | On Apr 1, 2023, Roman A. Bapinaev and others published New data on high-latitude hadrosaurid dinosaurs from the Upper Cretaceous Kakanaut Formation of Chukotka, Russia | Find, read ...Upper boundary definition: FAD of the Planktonic Foraminifer Rotalipora globotruncanoides: Upper boundary GSSP: Mont Risoux, Hautes-Alpes, France: Upper GSSP ratified: 2002: The Early Cretaceous (geochronological name) or the Lower Cretaceous (chronostratigraphic name) is the earlier or lower of the two major divisions of the ...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 ...Taxonomy and paleoecology of lyssacinosan Hexactinellida from the Upper Cretaceous (Coniacian) of Bornholm, Denmark, in comparison with other Postpaleozoic representatives. Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft , …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 ...Jun 6, 2022 · Occurrences of the Upper Cretaceous sediments in southwestern Slovakia. The numbers refer to the description in the text. (1) Magura nappe system, (2) Jarmuta Fm., Pieniny Klippen Belt, (3) Vienna Basin, (4) Upper Cretaceous atop of Hronic nappe, (5) Chtelnica Fm., Turonian freshwater limestones, (6) Horné Belice Group, (7) Hubina Fm., (8), Horné Belice Group (9) Upper Cretaceous sediments ... 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 ...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 ... 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]