Upper cretaceous.

The Cretaceous/Palaeogene mass extinction eradicated 76% of species on Earth1,2. ... This proxy provides a firm upper limit of 8 kyr for deposition, assuming none of the 3 He is reworked.In the lower Cretaceous, the structural traps are usually controlled by faults, such as faulted noses or tilted fault blocks. Although structures in lower Cretaceous is greater in number, they are more complex and faulted. The scale and amplitude of structural traps in lower Cretaceous is also smaller than that in upper Cretaceous.A similar reduction trend can also be traced among the fossil pollen organs. Modern type pollen organs occur in the Upper Cretaceous (Maastrichtian or Campanian) of Canada (Serbet, 1996, Rothwell and Holt, 1997; Crane, pers. comm.), while Ginkgo liaoningensis (Liu et al., 2006) of the Lower Cretaceous bears more than two pollen sacs.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 ...Upper Cretaceous biostratigraphy 7 Studia UBB Geologia, 2017, 61 (1-2), 5 - 20 will be achieved in the descendant species. It continues with the onset of the test morphology that occurs in the descendant, but specimens of the descendant that present features of the ancestor also occur and are more frequent in the lower portion

The Cretaceous Period is a classic example of a "greenhouse state" in Earth history (Skelton, 2003) that was marked by rapid climate perturbations, multiple oceanic anoxic events (OAEs), deposition of oceanic red beds (CORBs), intense volcanic activities and a long period of normal geomagnetic polarity (Cretaceous Normal Superchron: CNS).). Although marine sedimentary rocks comprise the ...

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.In this area, the studied Upper Jurassic-Lower Cretaceous source rocks are characterized by fine-grained organic shale and mudstone from Upper Jurassic to Lower Cretaceous ages. Moreover, shale volume and lithology were estimated in order to check the reliability of the calculated parameters for different lithologies.

This study reports on a new ceratopsid, Spiclypeus shipporum gen et sp. nov., from the lower Coal Ridge Member of the Judith River Formation in Montana, USA, which dates to ~76 Ma (upper Campanian). The species is distinguished by rugose dorsal contacts on the premaxillae for the nasals, laterally projecting postorbital horncores, fully fused and anteriorly curled P1 and P2 epiparietals, and a ...Feb 9, 2011 · Background A dinosaur census recorded during the Hell Creek Project (1999–2009) incorporates multiple lines of evidence from geography, taphohistory, stratigraphy, phylogeny and ontogeny to investigate the relative abundance of large dinosaurs preserved in the Upper Cretaceous Hell Creek Formation of northeastern Montana, USA. Overall, the dinosaur skeletal assemblages in the Hell Creek ... 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 ...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.

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 ...

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 …

Planktonic foraminifera are one of the most stratigraphically important groups of organisms for the Cretaceous system. However, standard foraminiferal zonations based mostly on species from the Tethyan bioprovince are hardly applicable in temperate regions where warm-water taxa are scarce or lacking. We propose a foraminiferal zonation based on foraminiferal events recognized in the northern ...Introduction. The Menefee Formation represents one of the most promising frontiers for exploring the early evolution of major dinosaur groups in Laramidia, the Upper Cretaceous landmass consisting of Mexico, the western United States, western Canada, and Alaska (Fig. 1 in Sampson et al. (2010)).Dating to approximately 84-78 million years ago (Siemers & King, 1974; Molenaar et al., 2002 ...The deposits corresponding to the Upper Cretaceous Neuquén and San Jorge Gulf basins from northern and central Patagonia have provided two of the most complete sequences of terrestrial vertebrate faunas of all Gondwanan landmasses. Among the carnivorous components, the carcharodontosaurid theropods appeared as common elements during the Early ...According to Skourtsis-Coroneou et al. (1995) the Upper Cretaceous deposits, mentioned as "clastic limestones" from the western to eastern part, from the external to internal Ionian zones, consist of: A. In the external (western) parts have a micritic matrix, consist of floatstones, rudstones and rare grainstones and packstones with micritic or biomicritic intercalations.The deposits corresponding to the Upper Cretaceous Neuquén and San Jorge Gulf basins from northern and central Patagonia have provided two of the most complete sequences of terrestrial vertebrate faunas of all Gondwanan landmasses. Among the carnivorous components, the carcharodontosaurid theropods appeared as common elements during the Early ...

This study reports on a new ceratopsid, Spiclypeus shipporum gen et sp. nov., from the lower Coal Ridge Member of the Judith River Formation in Montana, USA, which dates to ~76 Ma (upper Campanian). The species is distinguished by rugose dorsal contacts on the premaxillae for the nasals, laterally projecting postorbital horncores, fully fused and anteriorly curled P1 and P2 epiparietals, and a ...A palynological and organic geochemical study of the Upper Cretaceous deposits cropping out in the southwestern part of the Transylvanian Basin (Petreşti section) has been carried out. The samples were collected from the marine Bozeş as well as from the overlying continental Sebeş formations, with main focus on the Bozeș Formation.While they are similar, the upper torso and the chest are not the same thing. The upper torso is considered to be anything above the waist and below the neck, including the shoulders and back.A limited exposure of Upper Cretaceous marine siltstones and claystones near the coastal town of Carlsbad, California, contains a remarkably well-preserved ...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. The carapace length of other turtles from the Upper Cretaceous of China is typically no more than 50 cm . Therefore, the estimated carapace length based on egg size of CUGW EH051 is most compatible with the size range of Nanhsiungchelyidae and Khunnuchelys , although not definitive for identifying the egg's affinity.

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 in this area.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 Cretaceous formation was formed from alluvial floodplains of ...

The Upper Cretaceous succession of the Western Interior Basin of the United States, locally yields abundant ammonites on which a standard zonation (Fig. 27.9) is based, and abundant radioisotopically dated volcanic ash beds in the region form the basis for the Late Cretaceous age model (Cobban et al., 2006; Sageman et al., 2014).Background Extended neoteny and late stage allometric growth increase morphological disparity between growth stages in at least some dinosaurs. Coupled with relatively low dinosaur density in the Upper Cretaceous of North America, ontogenetic transformational representatives are often difficult to distinguish. For example, many hadrosaurids previously reported to represent relatively small ...Trinity Group stratigraphic column in Texas. The Trinity Group is a group (sequence of rock strata) in the Lower Cretaceous lithostratigraphy of Texas, Arkansas, Mississippi, Louisiana and Oklahoma. It is named for the Trinity River of Texas.. A stratigraphic column at the Mount Bonnell Fault location starts with the Lower Cretaceous Trinity Group overlain by the Edwards Group.The Upper Cretaceous Iharkút vertebrate locality (Bakony Mountains, Hungary) provided a diverse lizard fauna. In order to infer their food preference, jaw and tooth morphology, as well as dental ...The integument of the theropod dinosaur Carnotaurus sastrei from the Upper Cretaceous of Argentina is here described in detail for the first time. The scaly skin of this abelisaurid is the most completely preserved of any theropod and the only example of this form of integument known outside of Tetanurae (excluding footprints). The skin is ...Upper Cretaceous subsurface stratigraphy and structure of coastal Georgia and South Carolina is based on the study of 24 wells along two transects, one extending across the seaward-dipping sedimentary basin termed the 'Southeast Georgia Embayment' northeastward to the crest of the Cape Fear Arch, and the other alined east-west, parallel to the basin axis and including the COST GE-l well on the Out Most hydrocarbon production from low-permeability Upper Cretaceous and lower Tertiary reservoirs in the Greater Green River basin of Wyoming, Colorado, and Utah is gas. The most likely sources of the gas are the interbedded coal beds and other carbonaceous lithologies. A source-rock evaluation of these rocks indicates predominantly humic, type ...Section snippets Locality and horizon. The fossil material here described comes from the Upper Cretaceous Chorrillo Formation (upper Campanian-Maastrichtian), La Anita Farm, near El Calafate city, in southwest Santa Cruz Province, Patagonia, Argentina (Fig. 1).The stratigraphic succession of the Chorrillo Formation is made up of intercalated levels of greenish and reddish sandstones, with ...The specimen under study was collected during field seasons of 1998 as part of a paleontological survey of the upper Cretaceous sedimentary units of the Antarctic Peninsula. It was found partially articulated by Allen J. Kihm, of Minot State University, and is permanently housed in the South Dakota School of Mines and Technology (SDSM 78147 ...

The Cenomanian Mishrif Formation is the main Upper Cretaceous carbonate reservoir in southern Iraq. For decades it has produced large quantities of oil from the major structures, such as Zubair, Rumaila and West Qurna. The main reservoir units in the formation are represented by bioclastic and peloidal limestones with intergranular and ...

Cretaceous Dinosaurs in Parks. Cretaceous (145 to 66 Ma) dinosaur fossils in the NPS are geographically more scattered than the Triassic and Jurassic examples. In recent years, Alaska's parks have become significant for tracks, especially at Denali National Park and Preserve, where hadrosaur tracks are abundant.Bryce Canyon National Park (Utah), has a notable record of microfossils from ...

A partial skull of a pachycephalosaurid from the Upper Cretaceous Hell Creek Formation, Montana, is interpreted as a new taxon, Platytholus clemensi gen. et sp. nov. MOR 2915 does not fit into an ...Upper Cretaceous rocks investigated in this report include (in ascending order) the middle and upper parts of the Mancos Shale, Mesaverde Group (Formation), and lower part of the North Horn Formation. Nomenclature for these rocks is complex and has been used inconsistently by previousMantelliceras, with strong, alternately long and short ribs, and tubercles which may be lateral, umbilical, ventrolateral, but never siphonal, is an early member of the super-family Acanthocerataceae which dominate the normally coiled Upper Cretaceous taxa. Early Cenomanian sands with this fauna are exposed in Dorset and Devon.ODP Leg 132, with some Upper Cretaceous sediment recovered at Sites 47, 48, 305, 577, and 810. The Cretaceous sections recovered at all sites during Leg 198 were characterized by pure nannofossil ooze in the Campanian and Maastrichtian and chert with nannofossil ooze and porcellanite in the older Cretaceous sections. The presence of ubiqui-Upper Cretaceous-Paleocene Magnetostratigraphy of the Longmenshan Foreland Basin and Its Implications for the Tectonic Deformation of the Longmenshan Fault Zone. ... The LMSFZ experienced two stages of uplift during the Cretaceous-Early Cenozoic (at 128.0-124.1 and 68.8-64.1 Ma). (b) The stress field generated by the subduction and ...Online. Angel Alejandro Ramírez Velasco, Felisa J. Aguilar, René Hernández-Rivera, José Luis Gudiño Maussán, Marisol Lara Rodríguez, Jesús Alvarado Ortega, Tlatolophus galorum, gen et sp. nov ., a parasaurolophini dinosaur from the upper Campanian of the Cerro del Puebño Formation, Coahuila, norther Mexico, Cretaceous Research, abril de …The Upper Cretaceous Timok Magmatic Complex (TMC) developed on a continental crust composed of different types of Proterozoic to Lower Cretaceous rocks. The TMC consists of the magmatic suites: Timok andesite (АТ) - Turonian-Santonian, Metovnica epiclastite (ЕМ) - Coniacian-Campanian, Osnić basaltic andesite (АО) and Ježevica ...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 ...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 Gaogou, Majiachun and Sigou formations in the Xixia Basin are composed of terrestrial clastic deposits, which are dominated by red-violet mudstones, muddy siltstones, siltstones, grayish fine-grained sandstones, intercalated with grayish, off-white medium- and coarse-grained sandstones or conglomerates.

A similar reduction trend can also be traced among the fossil pollen organs. Modern type pollen organs occur in the Upper Cretaceous (Maastrichtian or Campanian) of Canada (Serbet, 1996, Rothwell and Holt, 1997; Crane, pers. comm.), while Ginkgo liaoningensis (Liu et al., 2006) of the Lower Cretaceous bears more than two pollen sacs.The Campanian is the fifth of six ages of the Late Cretaceous Epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series.Campanian spans the time from 83.6 (± 0.2) to 72.1 (± 0.2) million years ago. It is preceded by the Santonian and it is followed …Analysis of foraminifera from the Igumale Formation of the southern Benue Trough was undertaken to determine the paleoecology and depositional environment of the sedimentary successions. The studied sections span a total stratigraphic thickness of 86.44 m comprising 85.34 m of drill core and 1.10 m outcrop section. The lithologies of the subsurface section are composed of massive to laminated ...Instagram:https://instagram. kansas relays high schoolspark ideaskansas football recruiting 2022premiere pro purchase To find the first quartile of a set of numbers, find the median of the lowest half of the data set. This median is the first, or lowest, quartile in the data set. To find the third, or upper, quartile of a data set, instead find the median ...Titanosauriform sauropod dinosaurs were once considered rare in the Upper Cretaceous of Asia, but a number of titanosauriforms from this stratigraphic interval have been discovered in China in recent years. In fact, all adequately known Cretaceous Asian sauropods are titanosauriforms, but only a few have been well studied, lending significance to any new anatomical information that can be ... barry goldberg running gifbylaws committee The dominant Cretaceous calcispheres. The extinct pithonellid forms dominate late Cretaceous calcisphere assemblages and can occur in rock-forming abundance 6,7,8.Before this study, their ... pick n pull inventory kansas city on Upper Cretaceous geological units using legacy industry 2-D seismic reflection and well data. It provides an integrated description and reliable subsurface evaluation of Upper Cretaceous potential storage reservoirs. In addition, it provides a detailed evaluation onThe 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 ). These Upper Cretaceous oceanic red beds (CORB, e.g., Hu and Sarti, 2002, Hu et al., 2005) characterized a majority of deep-marine pelagic and hemipelagic settings in oceanic basins from the early to mid-Turonian onwards with the exception of the equatorial Atlantic (Hofmann et al., 2003).