Upper cretaceous

Upper Cretaceous age of the sediments. Black shales are replaced by a pile of alternating reddish-brown, green, and gray-green noncalcareous clays (Cores 55-57); their thickness is about 80 meters. These deposits are characterized by scarce agglutinated foraminifers of the Upper Cretaceous—Plectina conversa, Recurvoides gerochi, Glomospira ...

The Upper Cretaceous sedimentary sequence in the James Ross Basin area includes the Santonian?-Maastrichtian Marambio Group, which consists of marine clastic sediments with a diverse and abundant mega fossil fauna and flora (Crame et al., 1999, 2004).PDF | One hundred permineralized cones, 1.0-1.2 mm x 1.5-2.0 mm, some attached to branching systems, have been examined from the Upper Cretaceous... | Find, read and cite all the research you need ...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.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.Thanatosdrakon (IPA: [θænətɒsdrɑːkɒn]) (meaning "dragon of death") is a genus of quetzalcoatline azhdarchid pterosaur from the Late Cretaceous (Upper Coniacian-Lower Santonian) Plottier Formation of the Neuquén Basin in western Argentina (Andes mountain range).The genus name is derived from the Greek words thanatos (=death) and drakon (=dragon), while the specific name is a Quechuan ...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 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 ...

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 ...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 ... 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 ... 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.The Cretaceous formations of southwestern Arkansas consist largely of unconsolidated sand, clay, and marl, but include some beds of limestone, sandstone, and chalk. They rest on a pre-Cretaceous erosion surface, which is cut on folded and faulted Paleozoic rocks and dips to the south and southeast at about 100 feet per mile. The Cretaceous beds dip south and southeast from 65 to 80 feet per mile.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 ...The Cretaceous period was the last and longest segment of the Mesozoic era. It lasted approximately 79 million years, from the minor extinction event that closed the Jurassic period about 145 ...

A new ornithopod dinosaur from the Upper Cretaceous (Maastrichtian) Snow Hill Island Formation, at James Ross Island, Antarctica is here described. This new taxon, named as Morrosaurus antarcticus gen. et sp. nov., is represented by a fragmentary right hind limb belonging to a medium-sized individual. Our phylogenetic analysis nests the new ...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. However, the transition of these apex predator faunas is poorly understood due to a paucity of pertinent lower Upper Cretaceous deposits and a scarcity of theropod remains from them [5,6]. Despite this, species of carcharodontosaurians have been recovered from two lower Upper Cretaceous formations (Cenomanian and Turonian) of Asiamerica and ...The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period, from about 146 to 136 million years ago (Ma) to the beginning of the Paleocene epoch of the Paleogene period, or Tertiary sub-era (about 65.5 to 64 Ma). As the longest geological period, the Cretaceous constitutes nearly half of the Mesozoic.Cretaceous was a period of intense tectonics placing India in a drifted position against the context of global paleogeography. India was dismembered from Gondwanaland and drifted northward as an island continent leading to many dramatic changes in basinal configurations as a result of the closure of the Gondwana rift basins as well as the …

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depth diagrams delineating the chronology of the Upper Cre- taceous sequences as well as Late Cretaceous sedimentation rates. We use this sequence ...Lower Cretaceous, but I am confident that it is Cenomanian in age and represents the lower part of the Upper Cretaceous as I stated in my "Upper Cretaceous Floras of the World", and in this I am corroborated by European paleontologists from the fauual evidence. Thus the matter stood until 1925, when W. W. BoyerRemains of juvenile sauropods from the Upper Cretaceous Portezuelo Formation (Neuquén Group), at Barreales Lake (Neuquén Province), are identified and described. The material include a femur (14.6 cm length) and an anterior caudal vertebra (3.1 cm length). Their general morphology allows us to assign these bones to the Titanosauria.Winton Formation. / -22.3; 143.1. / -51.8; 134.1. The Winton Formation is a Cretaceous geological formation in central-western Queensland, Australia. It is late Albian to early Turonian in age. [2] The formation blankets large areas of central-western Queensland. It consists of sedimentary rocks such as sandstone, siltstone and claystone.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.

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.The study area is located in the Rosario Embayment on the Pacific coast of Baja California, Mexico (Fig. 1 a and b).The Rosario Embayment consists of Upper Cretaceous to Palaeocene sedimentary rocks that constitute part of the Peninsular-Ranges fore-arc basin complex (Morris and Busby-Spera, 1990).Sediments within the fore-arc basin were sourced from the Upper Jurassic to Upper Cretaceous ...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). The Upper Cretaceous (Campanian-Maastrichtian) forearc turbidites are up to 1,200 m thick and crop out in NW-SE trending elongate basins about 40 km wide, extending along the central and eastern Pontides. We present new detrital zircon U-Pb ages, petrography, and paleocurrent measurements from the Campanian-Maastrichtian turbidites and ...A carbonate hardground surface with a bryozoan and vertical borings from the Upper Ordovician of Kentucky.. Carbonate hardgrounds are surfaces of synsedimentarily cemented carbonate layers that have been exposed on the seafloor (Wilson and Palmer, 1992). A hardground is essentially, then, a lithified seafloor. Ancient hardgrounds are found in limestone sequences and distinguished from later ...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 ...Feb 1, 2022 · 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 ... 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.In the Bighorn Basin of north-central Wyoming and south-central Montana, the Frontier Formation of early Late Cretaceous age consists of siliciclastic, bentonitic, and carbonaceous beds that were deposited in marine, brackish-water, and continental environments. Most lithologic units are laterally discontinuous. The Frontier Formation conformably overlies the Mowry Shale and is conformably overlaiThe provenance of the Upper Cretaceous Nubia sandstones from four vertical sections along Qena-Safaga and Qena-Quseir roads in central Eastern Desert of Egypt was investigated based on their modal composition and geochemical data. The Nubia sandstone samples are abundant in quartz content with low feldspar and lithic fragments. Their average modal composition (Q94.2F1.3R4.5) classifies them as ...

Lower Cretaceous, but I am confident that it is Cenomanian in age and represents the lower part of the Upper Cretaceous as I stated in my "Upper Cretaceous Floras of the World", and in this I am corroborated by European paleontologists from the fauual evidence. Thus the matter stood until 1925, when W. W. Boyer

Rudist bivalve, Maurens Formation, Upper Cretaceous, southwestern France. Rudists are a group of extinct box-, tube- or ring-shaped marine heterodont bivalves belonging to the order Hippuritida that arose during the Late Jurassic and became so diverse during the Cretaceous that they were major reef-building organisms in the Tethys Ocean, until their …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 …Mesaverde Formation or Mesaverde Group (Upper Cretaceous) at surface, covers 1 % of this area. Mesaverde Formation (north Wyoming) - Light-colored massive to thin-bedded sandstone, gray sandy shale, and coal beds. In Jackson Hole locally contains gold-bearing quartzite conglomerate. North of North Fork Powder River east of the Bighorn Mountains ...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 ...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 ...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 ...In this paper, we demonstrate a down-paleoslope shift in detrital zircon provenance signatures correlated with shallow-marine lithofacies patterns from the Upper Cretaceous La Anita Formation and underlying continental slope lithofacies of the Alta Vista Formation (Magallanes-Austral Basin, southern Patagonia).Jun 1, 2021 · Remains of juvenile sauropods from the Upper Cretaceous Portezuelo Formation (Neuquén Group), at Barreales Lake (Neuquén Province), are identified and described. The material include a femur (14.6 cm length) and an anterior caudal vertebra (3.1 cm length). Their general morphology allows us to assign these bones to the Titanosauria.

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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 ...For the Upper Cretaceous they are the Cenomanian, Turonian, Coniacian, Santonian, Campanian, and Maastrichtian. The longest is the Aptian, lasting about 12 million years; the Santonian is the shortest at just under 3 …Japanese Upper Cretaceous marine reptile fossils occur in five major stratigraphical units: the Yezo, Kuji, Futaba, Izumi, and Goshoura groups (Figs. 1 and 2; Table 1).Many of these specimens were excavated by private collectors and donated to local museums; therefore, their locality data is based solely on museum records and/or published accounts.A new megaraptoran theropod dinosaur from the Upper Cretaceous Bajo de la Carpa Formation of northwestern Patagonia. Cret. Res. …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 ...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 ... 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 basin-floor fans in the Voring Basin, Mid Norway shelf 1(53 They are interpreted as concentrated flow to turbidity flow deposits modified by a wave field appearing at the ambient water-flow interface during deposition, as is commonly observed for channel spillover deposits. However, reworking by deep-storm waves cannot be ...Upper Cretaceous stages, Western In terior formations with fossil zones 1-10, and important molluscan species (modifi ed from Stephenson and Reeside, 1938, p.1636- 38).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 achieving their peak abundances and diversity.The Upper Cretaceous-Paleogene strata are developed in the basin, fed predominantly with alluvial and fluvial sediments with lacustrine deposits like siltstones and mudstones that are the major petroleum source rocks in all these basins (Shinn et al., 2010; Xu and Gao, 2015a; Xu et al., 2018). ….

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. The Lo Hueco fossil site (Cuenca, Spain) is one of the most relevant localities for the study of Late Cretaceous continental vertebrate faunas from Europe. The fossil record of theropod dinosaurs from this locality is represented by scarce isolated postcranial materials that were preliminarily attributed to abelisaurids and to a possible giant bird, in addition to a large assemblage of ...Robert G. Loucks, Toti E. Larson, Charlie Y. C. Zheng, Christopher K. Zahm, Lucy T. Ko, James E. Sivil, Peng Sheng, Stephen C. Ruppel, William A. Ambrose; Geologic characterization of the type cored section for the Upper Cretaceous Austin Chalk Group in southern Texas: A combination fractured and unconventional reservoir.It is during the Cretaceous that the first ceratopsian and pachycepalosaurid dinosaurs appeared. Also during this time, we find the first fossils of many insect ...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. 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 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 ...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 … 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]