Upper cretaceous
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.Following a multi-proxy analysis of the Upper Cretaceous high-productivity sequence from proximal and distal basins in Israel, Meilijson et al. (Paleobiology 42:77–97, 2016) provided evidence ...The carnivore Tyrannosaurus rex dominated the late Cretaceous in the north while monstrous meat-eaters like Spinosaurus, which had a huge sail-like fin on its ...
Did you know?
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 ...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 ... Two silicified fossil woods from outcrops of the Cerro Fortaleza Formation (Campanian, Upper Cretaceous) in Los Hornos Hill, Santa Cruz Province, Argentina are described. Based on their anatomical characteristics, both specimens were assigned to a new species of the fossil genus Brachyoxylon Hollick and Jeffrey, B. patagonicum sp. nov. They are characterized by having distinct growth ring ...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.the Cretaceous and lower Tertiary and are thought to result from both paleoseismic activity in the region a11d differential compaction of sedimentary deposits (Reinhardt, 1983). Our ability to interpret the distribution of lithofacies within the Upper Cretaceous and lower Tertiary units is strongly affected by their present outcrop pattern.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, …Dinosaurs from the Upper Cretaceous period in the western United States. Artwork showing the following dinosaurs (from left) Pachycephalosaurus, ...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.A recently discovered articulated partial skeleton of Ornithomimus from the Upper Cretaceous Dinosaur Park Formation of Alberta, Canada is remarkable in the extent and quality of preservation of integumentary structures including feathers. It is the first ornithomimid to preserve a tail bearing extensive plumaceous feathers that are slightly more elongate in comparison to those present on the ...A sturgeon (Actinopterygii, Acipenseriformes) from the Upper Cretaceous of Africa. A single dorsal bony scute from the uppermost Cretaceous (Maastrichtian) marine phosphatites of central Morocco is identified as an acipenserid fish (sturgeon). The new specimen represents the first occurrence of an acipenseriform fish on the continent of Africa.The Lance (Creek) Formation is a division of Late Cretaceous (dating to about 69 – 66 Ma) rocks in the western United States. Named after Lance Creek, Wyoming, the microvertebrate fossils and dinosaurs represent important components of the latest Mesozoic vertebrate faunas. The Lance Formation is Late Maastrichtian in age ( Lancian land ...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 …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 ... The upper Cretaceous Naparima Hill Formation, a primary source rock for conventional oil and gas reservoirs in Southern and Columbus basins, Trinidad is now considered an unconventional reservoir ...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. 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 statistical and probabilistic analyses of a database of Upper Cretaceous tropical dinoflagellate cysts from Venezuela allow us to recognize 21 species in the optimal stratigraphic sequence. Compilation of the dinoflagellate cysts reported in ten studies of Upper Cretaceous tropical localities from northern South America and the Gulf of Guinea allow the recognition of a rich assemblage (262 ...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 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 ...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 …
Upper Cretaceous paleoenvironmental changes and petrophysical responses in lacustrine record (Songliao Basin, NE China) and marine sedimentary deposit (Goban …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 ... A second hole, Hole 258A, was drilled to 123.5 meters below seafloor (mbsf) with the goal of improving recovery of the upper portion of the sequence. Cretaceous sediments discussed in this study consist of nannofossil ooze (258A-8 through -9), nannofossil chalk (cores 258-5 through -13) and organic-rich claystone (258-14) with a distinctive ...…
Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. The Campanian is the fifth of six ages of the Late Cre. Possible cause: The Upper Cretaceous site of Lo Hueco (Cuenca, Spain) has yielded several specimens.
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 genus and species of tetrablemmid spider, Electroblemma bifida n. gen. et sp., is described, from two adult males found in Upper Cretaceous (Cenomanian) amber of Myanmar. The genus is distinguished by its enormous dorsal carapace projection and highly modified chelicerae.
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 According to the most popular theory, the Brachiosaurus dinosaur became extinct during the end of the Cretaceous period due to the impact of a meteor on Earth’s surface.We describe a globally rare example of a tetrapod burrow from the Upper Cretaceous Bauru Group (Bauru Basin) from Peirópolis, Minas Gerais State, Brazil. The sedimentary succession containing the burrow includes a rich vertebrate assemblage comprising fish, podocnemid turtles, mesoeucrocodylians, saurischian dinosaurs, among others.
Highlights. Two new leptoceratopsids are described The Cretaceous strata that were drilled include the Upper Cretaceous Mingshui Fm, the Sifangtai Fm, the Nenjiang Fm, the Yaojia Fm, the Qingshankou Fm, the Quantou Fm, the Lower Cretaceous Denglouku Fm, the Yingcheng Fm, and the Shahezi Fm. From the SK-2e borehole, a total length of 130.47 m of core was recovered for Nenjiang Fm.The linkage between marine transgression and lacustrine source rock development has been highlighted for decades. Here, improved understandings were obtained on this challenging issue based on valuable comprehensive profiles from the Upper Cretaceous Songliao Basin, NE China (Qingshankou Formation, brief as K 2 qn 1). 48 shale samples from the Central Depression in the northern Songliao Basin ... In the Japanese Upper Cretaceous, elasmosaurid reSep 4, 2023 · The first fossils of short-tail 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 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 ... Trinity Group stratigraphic column in Texas. The Upper Cretaceous formations at the 12 study localities are herein divided into three informal time-stratigraphic units based on fossil content and contact relations with adjacent strata. The basal unit in most places extends from the base of the Graneros to the top of the Niobrara, generally to the horizon of the fossil Scaphites ...3.1 Cretaceous to Early Eocene. The Sabah basement rock mostly includes metamorphic, igneous, ultrabasic rock, and cherts (Chert-Spilite Formation) associated with ophiolite complex that formed during Early Cretaceous [].Based on the presence of ophiolites, Hutchison [] interpreted this unit as oceanic crust although some authors such as Reinhard and Wenk [] and Leong [] believe that the ... Upper Cretaceous and Lower Cretaceous aquifers are Choristoderes, sometimes informally called chamThe upper Cretaceous Austin Chalk Group in south-central Te 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.The basin fill thins toward the basin margins (Fig. 1) and is dominated by Cretaceous terrigenous successions. The Upper Cretaceous strata composed of the Qingshankou (K 2 qn), Yaojia (K 2 y), Nenjiang (K 2 n), Sifangtai (K 2 s) and Mingshui (K 2 m) formations (Fig. 1) comprise excellent source rocks in the Qingshankou (K 2 qn) and Nenjiang (K ... Request PDF | On Apr 1, 2023, Roman A. Bapinaev and other 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). The Ingersoll shale, a thin (<1 m) clay-dominat[Isolated shark teeth in Upper Cretaceous rocks of theUpper Jurassic (Oxfordian) Smackover Formation is Chapter 6 Evolution of the Upper Cretaceous Oysters: Traditional Morphometrics Approach Ahmed A. Abdelhady and Ashraf M.T. Elewa Idea and Aims The faunal association, which is revealed by newly discovered, well preserved, and therefore highly diverse assemblages, enabled us to recognize some phyloge- netic trends in the Upper Cretaceous oysters.