Upper cretaceous.

Theropod and other dinosaurian tracks from the upper Lower Cretaceous of northeastern China: overlooked Fuxin Biota records reinvestigated. , Cretaceous Research, 135 105190, 1-9Upper Jurassic (Oxfordian) Smackover Formation is a source of hydro-carbon. In eastern Texas and western Louisiana to the south where the Eagle Ford is thin to absent, hydrocarbons in the Austin Chalk are derived from sources in older Upper Cretaceous rocks (Hood and others, 2002). Hydrocarbons migrated into conventional reservoirs in the AustinThe record of Upper Cretaceous dinosaurs in China is dominated by skeletal body fossils, while the dinosaur track record has remained sparse. The new discovery of dinosaur tracks from the Shaxian Formation in Longxiang Village, Fujian Province, is the largest Upper Cretaceous ichnofauna known from China and the first recorded "evidence of" dinosaurs in Fujian Province.May 11, 2021 · Ootaxa placed within Laevisoolithidae have previously been described from the Upper Cretaceous of India, Mongolia, Morocco, as well as the Lower Cretaceous of Japan and include Laevisoolithus ...

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 …

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.

The Upper Cretaceous succession (formerly the Colville Group, which was abandoned by Mull et al., 2003) includes the upper part of the Hue Shale and the Seabee, Tuluvak, lower part of Canning, Schrader Bluff, and Prince Creek Formations (Fig. 2).Upper Cretaceous strata are absent on the highstanding Arctic Platform owing to either nondeposition or erosion, and are absent due to erosion across ...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 ...Section snippets Materials and experiments. Twenty-one lacustrine shale core samples were obtained from the Upper Cretaceous Qingshankou Formation (K 2 qn) of Songliao Basin, NE China. The Songliao Basin is a Mesozoic-Cenozoic basin with an area of about 260,000 km 2 (Fig. 1). The Qingshankou Formation of Songliao Basin consists of lacustrine mudstone and shale up to 550 m thick that ...Apr 1, 2023 · The Upper Cretaceous Qingshankou Formation in the Songliao Basin, NE China is known to contain excellent petroleum source rocks. In addition, it serves as a valuable record to study depositional conditions within the water column and climatic change. Paleogene Period. The Cretaceous* saw the first appearance and initial diversification of flowering plants (Angiosperms). Insects and other organisms soon evolve to take advantage of the new food sources and opportunities these plants provide. Conifers continued replacing seed ferns, ginkgos and cycads. Marine life flourished, with many groups ...

The Upper Cretaceous-Paleocene turbiditic deposits of the Skole Nappe are distinguished as the Ropianka Formation (formerly as the noceramian Beds), which are at least 500 m thick (Wdowiarz, 1949; Kotlarczyk, 1978).They are overlain by the mudstone-dominated Upper Paleocene-Eocene Variegated Shale Formation (Rajchel, 1990).The Bąkowiec section of the Ropianka Formation (Leszczyny Member ...

Aug 1, 2022 · 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 ...

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.Scientific Reports (2016) Tyrannosaurids were top predators in Asia and North America during the latest Cretaceous and most species had deep skulls. Here, Lü et al. describe mature fossils of ...The Upper Cretaceous palaeovegetation in the Gippsland Basin was comprised of higher plants including both gymnosperms and angiosperms. Various aromatic angiosperm/gymnosperm indices were calculated and compared to each other and to aliphatic parameters. The aro-AGI (PAH) parameter is less reliable for evaluating the contribution of gymnosperms ...A nearly complete skeleton of a new hadrosaurid, Kamuysaurus japonicus gen. et sp. nov., was discovered from the outer shelf deposits of the Upper Cretaceous Hakobuchi Formation of the Yezo Group ...The Nemegt Basin is located in the Gobi region of Southern Mongolia (Fig. 1 A, B).During the late Cretaceous, the Gobi Desert was a landmass interior with a continental climate, covered by wooden areas and meandering and braided rivers (Gradziński, 1970; Eberth et al., 2014; Eberth, 2018).The Nemegt Basin sediments were initially subdivided by Gradziński (1970) into the Lower ...

Liu, B. et al. Algal-microbial community, paleoenvironment, and shale oil potential of lacustrine organic-rich shale in the upper Cretaceous Nenjiang formation of the southern central depression ...Mar 18, 2021 · A new articulated postcranial specimen of an indeterminate ankylosaurid dinosaur from the Upper Cretaceous (middle-upper Campanian) Baruungoyot Formation from Hermiin Tsav, southern Gobi Desert ... Jun 1, 2022 · 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). 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.The Lower Cretaceous is the first geological epoch in the Cretaceous. It began 145 million years ago, and ended 100.5 million years ago. ... In the Lower Cretaceous, the sea level was much lower than in the Upper Cretaceous. In the Wealden, Southern England was a huge tropical river delta; in the Greensand the same areas were just offshore.

depth diagrams delineating the chronology of the Upper Cre- taceous sequences as well as Late Cretaceous sedimentation rates. We use this sequence ...

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 portionCretaceous 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 ...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).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 Upper Cretaceous units of the Golfo San Jorge Basin, where the vertebrate fossil record is significant, comprise Bajo Barreal (early Cenomanian-late Turonian) and Lago Colhué Huapi (Coniacian-Maastrichtian) formations (see Casal et al., 2015, 2016). The variety of fossil vertebrates in these units constitutes an excellent opportunity to ...The irregular spatial distribution is explained by the fact that in the most of the West Siberian sedimentary basin the Cretaceous is overlapped by Cenozoic sediments (e.g. Kontorovich et al., 2014). Upper Cretaceous outcrops are only available at the flanks of the basin, and in the Yenisei–Khatanga trough in the east.Choristoderes, sometimes informally called champsosaurs, are a clade of semiaquatic diapsids with an extremely long stratigraphic range. The first choristoderes were described in the late 1800s, but until the early 1990s they were only known from the Upper Cretaceous and Paleocene of North America and Europe, a span of about 15 million years.Description of new hadrosaurid fossils from the Upper Cretaceous Kakanaut Formation (Chukotka, Russia) and a study on their histology is published by Bapinaev et al. (2023), who interpret the studied fossils as …

Upper boundary GSSP candidate section (s) None. The Jurassic ( / dʒʊˈræsɪk / juu-RASS-ik [2]) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period 201.4 million years ago (Mya) to the beginning of the Cretaceous Period, approximately 145 Mya. The Jurassic constitutes the middle period of the ...

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.

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 Cretaceous formations of North Carolina; Part 1, Invertebrate fossils of the Upper Cretaceous formations. North Carolina Geological and Economic Survey , 5 , 604 p. Google ScholarThe 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 ...In 2006, technician Diego Rosales of the Universidad Nacional del Comahue discovered a partial postcranial skeleton of a large theropod in an exposure of the Upper Cretaceous (Santonian) Bajo de la Carpa Formation at a site known as Tratayén in Neuquén Province, northwestern Patagonia, Argentina (Fig. 1 A).The specimen was preliminarily reported in an abstract by Porfiri et al. (2008b).Lithology and Depositional Environment: The Upper Cretaceous Naparima Hill Formation is a sequence of well-bedded, sometimes bituminous mudstones and shales, with some marls and bituminous lime. The upper part of this formation is made of silicified siltstone/claystone referred to colloquially as "argiline" or "argillite." Cherts are abundant ...Fossil sites of Late Late Cretaceous period – Nemegtian age (Maastrichtian) or Upper Upper Cretaceous, “Nemegt Formation” (70 million years from now). The richest dinosaur fossil sites are frequently found in areas, such as Bayanshiree, Khongil Tsav, Amtgai, Baishin Tsav, Urulbu khudag, Shar Tsav in the Eastern part of Gobi Desert ...Apatite U–Pb dating of dinosaur teeth from the Upper Cretaceous Nemegt Formation in the Gobi Desert, Mongolia: Contribution to depositional age constraintsThe Cretaceous is divided into Early and Late Cretaceous epochs, or Lower and Upper Cretaceous series. In older literature the Cretaceous is sometimes divided into three series: Neocomian (lower/early), Gallic (middle) and Senonian (upper/late). A subdivision in eleven stages, all originating from European stratigraphy, is now used worldwide. ...To date, the most complete and largely articulated specimen is the holotype of Sachicasaurus vitae Páramo-Fonseca et al., (2018) from the upper Barremian (Lower Cretaceous) of Colombia. It is 990 cm long measured from the tip of the snout to the posterior end of the last preserved caudal vertebra (Páramo-Fonseca et al., 2018).

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.Upper GSSP ratified. 2002 [3] The Albian is both an age of the geologic timescale and a stage in the stratigraphic column. It is the youngest or uppermost subdivision of the Early/Lower Cretaceous Epoch / Series. Its approximate time range is 113.0 ± 1.0 Ma to 100.5 ± 0.9 Ma (million years ago).First Upper Cretaceous dinosaur track assemblage from Jordan (Middle East) - preliminary results September 2020 Annales Societatis Geologorum Poloniae 90:331 - 342The Spinosauridae was a specialised group of large Lower to Upper Cretaceous carnosaurs. The crocodile-like snout of Spinosaurus (Fig. 101d) from Africa suggests a connection with Baryonyx (Fig. 123) from England and possibly Africa, while Acrocanthosaurus (Fig. 101c) from the Lower Cretaceous of North America seems to have been allied to the Allosauridae.Instagram:https://instagram. colin dwyerlowes christmas stockingswhich president oversaw the spanish american warnapleton hyundai of carmel vehicles Tandon (2000) worked extensively on the sedimentology of the Lameta Formation in the Phutlibaori area and interpreted the Maastrichtian coastline (Fig. 1).The Lameta Formation of the Phutlibaori area consists of friable, medium- to coarse-grained and well-sorted glauconitic sandstone (Fig. 2, Fig. 3 a).The lower part of the section is a large-scale trough cross-stratified glauconitic sandstone. matthew o reillycollegiate travel planners 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 inferred as a subadult based on the osteohistological ...Upper Cretaceous clastic and carbonate source rocks are also present. Much crude oil in Upper Cretaceous reservoirs has been derived from organic-rich marine shales of the Tuscaloosa Formation. more » These shales are characterized by algal and higher plant kerogen, resulting in distinct crude oil compositions. kelsie payne The 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 ).Lambeosaurines have been traditionally split into the tribes or clades Parasaurolophini ( Parasaurolophus, Charonosaurus, others (?).) and Lambeosaurini ( Corythosaurus, Hypacrosaurus, Lambeosaurus, others.). [2] Corythosaurini (synonym of Lambeosaurini, see below) and Parasaurolophini as terms entered the formal literature in Evans and Reisz's ...The Upper Cretaceous Qingshankou Formation in the Songliao Basin, NE China is known to contain excellent petroleum source rocks. In addition, it serves as a valuable record to study depositional conditions within the water column and climatic change.