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).Upper Cretaceous rocks form a virtually continuous blanket over the Gulf of Mexico basin. Overall, the inner edge of the northern outcrop parallels the deeply buried Paleozoic Ouachita orogenic belt. Conspicuous projecting features, such as the Rio Grande and Mississippi embayments, are situated on pronounced salients of the older Ouachita ...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.Foraminifera are found in all marine environments, they may be planktic or benthic in mode of life. The generally accepted classification of the foraminifera is based on that of Loeblich and Tappan (1964). The Order Foraminiferida (informally foraminifera) belongs to the Kingdom Protista, Subkingdom Protozoa, Phylum Sarcomastigophora, Subphylum ...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.

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 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 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 Upper Cretaceous is the last geological epoch in the Cretaceous.It began 100.5 million years ago, and ended 66 million years ago.. The Cretaceous is traditionally divided into Lower Cretaceous (early), and Upper Cretaceous (late), because of the different rocks.The rocks reflect the conditions in which they were formed. From lowest to highest, it is subdivided into the Cenomanian, Turonian ...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 ...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 ...In Khalda structure, the Cretaceous section was interpreted on the seismic sections covering the Khalda Oil Field. It is indicated that the Upper Cretaceous Abu Roash and the Lower Cretaceous Alam-El Bueib formations have been affected by normal faulting. Though the implication of folding is minimized, it is traceable in the field.

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

The Late Cretaceous (100.5-66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series.The Cretaceous is named after creta, the Latin word for the white limestone known as chalk.The chalk of northern France and the white cliffs of south-eastern England date from the Cretaceous Period.

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 ... 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 ...Carcharodontosauridae theropod tooth crowns from the Upper Cretaceous (Bauru Basin) of Brazil: A reassessment of isolated elements and its implications to palaeobiogeography of the group. Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 556, 2020, Article 109870.Figure 1 Early Cretaceous paleogeography and principal fossiliferous exposures in central Niger. (A) Maps showing Niger and the location of the fossiliferous exposures in the Tiourarén Formation (localities: 1, Tiourarén and In Kaf; 2, Tamerát; 3, Fako and In Abaka; and 4, Tawachi) and middle horizons of the Tegama Group (Gadoufaoua); latitude in degrees north, longitude in degrees east.Upper Cretaceous rocks form a virtually continuous blanket over the Gulf of Mexico basin. Overall, the inner edge of the northern outcrop parallels the deeply buried Paleozoic Ouachita orogenic belt. Conspicuous projecting features, such as the Rio Grande and Mississippi embayments, are situated on pronounced salients of the older Ouachita ...The Upper Cretaceous, especially the latest Campanian and Maastrichtian period denoted for the first time that marine deposits were continuously and widely distributed across the whole GSB and its proximate regions (Snyder et al. 1985) coupled with carbonate accumulation. Thereby, conducting a paleoenvironmental study using Upper Cretaceous ...

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 …Numerous feathered dinosaur specimens have recently been recovered from the Middle-Upper Jurassic and Lower Cretaceous deposits of northeastern China, but most of them represent small animals 1 ...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 Upper Cretaceous (Turonian) Bissekty Formation of Uzbekistan has yielded many isolated bones and teeth representing a variety of non-avian theropod dinosaurs. A pedal phalanx II-2 indicates the presence of a dromaeosaurid theropod that attained a larger body size than any previously known member of that clade.Upper Cretaceous paleoenvironmental changes and petrophysical responses in lacustrine record (Songliao Basin, NE China) and marine sedimentary deposit (Goban …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 ...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 ...

10 de set. de 2021 ... Reference: “A Late Cretaceous dinosaur and crocodyliform faunal association–based on isolate teeth and osteoderms–at Cerro Fortaleza Formation ( ...Upper Cretaceous rocks of western Kansas are a treasury of fossils that has excited paleontologists for more than a century and has lured generations of enthusiastic collectors to concretion-strewn shale slopes and chalk badlands that break the monotony of the Great Plains. For decades, authors of historical geology and paleontology textbooks ...

Oct 18, 2023 · Cretaceous Period, in geologic time, the last of the three periods of the Mesozoic Era. The Cretaceous began 145.0 million years ago and ended 66 million years ago; it followed the Jurassic Period and was succeeded by the Paleogene Period (the first of the two periods into which the Tertiary Period was divided). 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).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 …These dromaeosaurid postcranial remains have been found mainly in Upper Cretaceous strata of southern France (Le Loeuff et al. 1992; Le Loeuff and Buffetaut 1998; Allain and Taquet 2000;Chanthasit ...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 ... Geology -- Maryland, Geology, Stratigraphic -- Cretaceous, Paleontology -- Cretaceous, Paleontology -- Maryland Publisher Baltimore, The Johns Hopkins press Collection cdl; americana Contributor University of California Libraries Language English Volume 2Upper 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 Out2001 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.The Naparima Hill Formation is an organic rich, oil-prone sedimentary sequence located in the upper section of the Cretaceous source rock of Trinidad (Rodrigues, 1988) (Fig. 2a).

Two species of the heteromorph ammonite genus Diplomoceras Hyatt are described from the Upper Cretaceous of the James Ross–Seymour Islands area, Antarctica. The late Campanian–early Maastrichtian D. lambi Spath has a relatively high rib density, whereas D. maximum n. sp. has a lower rib density and is known only from the uppermost Maastrichtian of the Lopez de Bertodano Formation on ...

The Upper Cretaceous succession is quite complete, with small hiatuses mostly present in the lower part (Marcinowski Citation 1980; Walaszczyk Citation 1987). The upper Campanian-lowermost Maastrichtian interval treated in this study is exposed near the town of Solec nad Wisłą (Figure 1).

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.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 ... Upper Cretaceous strata at Göynük, northwestern Anatolia, Turkey, provide a geological record of the Campanian-Maastrichtian from the Sakarya Terrane along the active Neotethys margin.A new integrated biostratigraphic concept of an Upper Cretaceous series near Novi Pazar, Stara Raška region, the Vardar Zone, for Bajevica-Mur and Gradina, is based on the distribution of benthic ...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 Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch …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 new small-bodied troodontid (LH PV39) recovered from the Upper Cretaceous Wulansuhai Formation, Suhongtu, Inner Mongolia, China, is described. The new specimen preserves six postaxial cervical vertebrae, five completely fused sacral and four posterior caudal vertebrae in addition to two manual unguals. The completely fused …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 largest pterosaur discovered in South America and one of the largest flying vertebrates in the world is described. Thanatosdrakon amaru gen. et sp. nov. is a new azhdarchid found in the upper-most levels of the Plottier Formation (upper Coniacian-lower Santonian, Neuquén Basin), Mendoza, Argentina.Two specimens were identified, the holotype (UNCUYO-LD 307) and the paratype, with an ...Theropod and other dinosaurian tracks from the upper Lower Cretaceous of northeastern China: overlooked Fuxin Biota records reinvestigated. , Cretaceous Research, 135 105190, 1-9Background 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 ...Instagram:https://instagram. lhc group saba cloud itrain loginjewel weekly ad nileskansas warhawkriversweeps platinum The Pierre Shale is a geologic formation or series in the Upper Cretaceous which occurs east of the Rocky Mountains in the Great Plains, from Pembina Valley in Canada [2] to New Mexico . The Pierre Shale was described by Meek and Hayden in 1862 in the Proceedings of the Academy of Sciences (Philadelphia). They described it as a dark-gray shale ...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. memorial hoursautozone 1 800 number The fossil remains of young dinosaurs are very rare. This juvenile hadrosaur is a cast of one of the fifteen individuals of baby Maiasaura ("good mother lizard") collected in 1978 by Princeton University from the Upper Cretaceous (80-65 million years ago) Two Medicine Formation of Teton County in western Montana. The presence of several small … states ranked by flatness 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 ...Cretaceous Period, in geologic time, the last of the three periods of the Mesozoic Era. It began 145 million years ago and ended 66 million years ago and featured the extinction of the dinosaurs at the end …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 ...