Mesozoic fill-sequences in Hefei Basin: Implication for Dabie
... combination of lage-scale cross-bedding, wave diagonal bedding and wave lamination are developed. It is also found that the sorting and roundness of gravels is between the medium rank to the low one, and the gravels are generally smaller than 0.2 m. J2-3z3: thick grey sandy conglomerates and medium- ...
... combination of lage-scale cross-bedding, wave diagonal bedding and wave lamination are developed. It is also found that the sorting and roundness of gravels is between the medium rank to the low one, and the gravels are generally smaller than 0.2 m. J2-3z3: thick grey sandy conglomerates and medium- ...
DOC, 365KB - Offshore Petroleum Exploration Acreage Release
... considered to be poor compared to other areas along the North West Shelf. Interpreted mild structural deformation in the Late Jurassic and Early Cretaceous suggests that restricted depocentres did not exist, thus claystone source rocks typical of the adjacent Carnarvon and Browse basins could not ac ...
... considered to be poor compared to other areas along the North West Shelf. Interpreted mild structural deformation in the Late Jurassic and Early Cretaceous suggests that restricted depocentres did not exist, thus claystone source rocks typical of the adjacent Carnarvon and Browse basins could not ac ...
on April 6, 2015 gsabulletin.gsapubs.org Downloaded from
... one fault extends along the base of Cerro San relationships could be measured and interpreted Ramon, immediately east of Santiago. The with reasonable accuracy. fault is ". . . marked by large triangular rock About 50 per cent of the geology within facets that face the valley. These facets are cut t ...
... one fault extends along the base of Cerro San relationships could be measured and interpreted Ramon, immediately east of Santiago. The with reasonable accuracy. fault is ". . . marked by large triangular rock About 50 per cent of the geology within facets that face the valley. These facets are cut t ...
Document
... Papa Agie member.-The uppermost member consists of ocher and red mudstone, lighter colored, lenticular sandstone beds, and analcite beds between the Alcova limestone member and the overlying Nugget sandstone. Vertebrate remains found along the northeastern flank of the Wind River Mountains indicate ...
... Papa Agie member.-The uppermost member consists of ocher and red mudstone, lighter colored, lenticular sandstone beds, and analcite beds between the Alcova limestone member and the overlying Nugget sandstone. Vertebrate remains found along the northeastern flank of the Wind River Mountains indicate ...
Empplacement Of The Bibai And Gogai Nappes, Northeast Of Quetta
... nappe suggesl that these rocks were deposited on the continental slope while the same foxmation is well bedded at the base of Bibai nappe indicating deposition on continental shelf. All these observations indicate that a considerable tectonic transport was involved in the emplacement of Gogai nappe ...
... nappe suggesl that these rocks were deposited on the continental slope while the same foxmation is well bedded at the base of Bibai nappe indicating deposition on continental shelf. All these observations indicate that a considerable tectonic transport was involved in the emplacement of Gogai nappe ...
Paleogeographic and tectonic implications of Jurassic sedimentary
... transition from shallow-marine rocks of the Fairview Valley Formation to the subaerial Sidewinder volcanic series. Quartzose sandstones occur below, within, and above the transitional sequence and indicate that texturally mature, craton-derived quartz sand gained access to the arc during the initial ...
... transition from shallow-marine rocks of the Fairview Valley Formation to the subaerial Sidewinder volcanic series. Quartzose sandstones occur below, within, and above the transitional sequence and indicate that texturally mature, craton-derived quartz sand gained access to the arc during the initial ...
British Columbia Geological Survey Geological Fieldwork 1993
... The Karmutsen Formation underlies )st m of the northern andeastern parts of the map area1 +hereit Jorm,; subdued hummocky terrain (Figure 3). The ;uccessiorI is composed of dark greenish grey to purplish grey and maroon, hematitic basalticlava flows with I linor intercalated pillows, pillow breccias ...
... The Karmutsen Formation underlies )st m of the northern andeastern parts of the map area1 +hereit Jorm,; subdued hummocky terrain (Figure 3). The ;uccessiorI is composed of dark greenish grey to purplish grey and maroon, hematitic basalticlava flows with I linor intercalated pillows, pillow breccias ...
Stratigraphic and structural evolution of the Blue Nile Basin
... E-trending Axum–Adigrat and Ambo lineaments (Abebe et al. 1998) bordered this region in the north and south, respectively (Figure 1). The topography of the Northwestern Ethiopian Plateau is shaped by the presence of outstanding 10.7–22.4 Ma old (40Ar/39Ar ages of Kieffer et al. 2004) shield volcanoe ...
... E-trending Axum–Adigrat and Ambo lineaments (Abebe et al. 1998) bordered this region in the north and south, respectively (Figure 1). The topography of the Northwestern Ethiopian Plateau is shaped by the presence of outstanding 10.7–22.4 Ma old (40Ar/39Ar ages of Kieffer et al. 2004) shield volcanoe ...
CHAPTER 4 PRE-TERTIARY GEOLOGY OF NEVADA
... Bullfrog Hills and Trappman Hills in Nye County may be Precambrian in age, and are so designated on plate 4-1, following the State map. However, both show some similarities to metamorphic rocks elsewhere in Nevada that have now been shown to be of late Precambrian and Paleozoic age. These two areas, ...
... Bullfrog Hills and Trappman Hills in Nye County may be Precambrian in age, and are so designated on plate 4-1, following the State map. However, both show some similarities to metamorphic rocks elsewhere in Nevada that have now been shown to be of late Precambrian and Paleozoic age. These two areas, ...
Tertiary Development of the Zagros Mountains
... represented as spectacular, high amplitude anticlines and mountain peaks that rise between 3,000 and 3,650m above sea level (Alan, 1969). In 1908, oil was discovered within one of the anticlines which led to several successful and unsuccessful attempts to drill and prospect for oil. Now, the Zagros ...
... represented as spectacular, high amplitude anticlines and mountain peaks that rise between 3,000 and 3,650m above sea level (Alan, 1969). In 1908, oil was discovered within one of the anticlines which led to several successful and unsuccessful attempts to drill and prospect for oil. Now, the Zagros ...
Hydrocarbon basins in SE Asia: understanding why they are there
... Early Cenozoic, they are filled with Cenozoic sediments, most are rifted basins that are the product of regional extension, and they formed mainly on continental crust. Many different models have been proposed to account for their formation and age. Understanding basin development requires a better ...
... Early Cenozoic, they are filled with Cenozoic sediments, most are rifted basins that are the product of regional extension, and they formed mainly on continental crust. Many different models have been proposed to account for their formation and age. Understanding basin development requires a better ...
Cuban Geology - Red Cubana de la Ciencia
... To the SW of the Bahamian Cretaceous Platform edge are the slope deposits of the Camajuani Belt (Figs. 2 and 3). In Central Cuba, Kimmeridgian shallow-water limestones have tentatively been identified (Pardo, 1975), but westward (in Matanzas province), deep-water equivalents are well known in explor ...
... To the SW of the Bahamian Cretaceous Platform edge are the slope deposits of the Camajuani Belt (Figs. 2 and 3). In Central Cuba, Kimmeridgian shallow-water limestones have tentatively been identified (Pardo, 1975), but westward (in Matanzas province), deep-water equivalents are well known in explor ...
download a .pdf of this paper: 2.7 MB; with cover, supplementary information and associated information
... between LIP volcanic deposits and stratigraphic sequences preserving evidence of the extinction. In most cases, uncertainties on radioisotopic dates used to correlate between geographically separated study areas exceed the duration of both the extinction interval and LIP volcanism by an order of mag ...
... between LIP volcanic deposits and stratigraphic sequences preserving evidence of the extinction. In most cases, uncertainties on radioisotopic dates used to correlate between geographically separated study areas exceed the duration of both the extinction interval and LIP volcanism by an order of mag ...
Geology of Svalbard
... Svalbard presents an exceptional geological diversity within a relatively small area. Although most of the land area is covered by glaciers, Svalbard is one of the few places in the world where sections representing most of the Earth’s history are easily accessible for study. Svalbard is thus both a ...
... Svalbard presents an exceptional geological diversity within a relatively small area. Although most of the land area is covered by glaciers, Svalbard is one of the few places in the world where sections representing most of the Earth’s history are easily accessible for study. Svalbard is thus both a ...
Facies analysis and depositional environments of the Upper
... The up to 258 m thick, carbonate-siliciclastic Upper Cenomanian to Campanian rocks (Sadr unit), which crop out widely in the Nakhlak area of central Iran, consist of conglomerates, sandy limestones and dolostones, calcareous sandstones, sandy-argillaceous limestones and reefal limestones. The lower ...
... The up to 258 m thick, carbonate-siliciclastic Upper Cenomanian to Campanian rocks (Sadr unit), which crop out widely in the Nakhlak area of central Iran, consist of conglomerates, sandy limestones and dolostones, calcareous sandstones, sandy-argillaceous limestones and reefal limestones. The lower ...
Lithostratigraphic and tectonic framework of Jurassic
... Jurassic and Early Cretaceous marine shales. Of special interest are black shales deposited during the Toarcian (latest Early Jurassic), which may represent an important global anoxic event, during which shales with high organic carbon content were deposited widely in oceans throughout the ...
... Jurassic and Early Cretaceous marine shales. Of special interest are black shales deposited during the Toarcian (latest Early Jurassic), which may represent an important global anoxic event, during which shales with high organic carbon content were deposited widely in oceans throughout the ...
Crustal-Scale Cross-Section of the US Cordillera
... and ophiolitic basement. The mid-Cretaceous angular unconformity visible in seismic reflection profiles from the Sacramento Valley may be due to: (1) west-down subsidence along the eastern margin of forearc basin; or (2) westward tilting of Late Jurassic and Early Cretaceous strata due to shortening ...
... and ophiolitic basement. The mid-Cretaceous angular unconformity visible in seismic reflection profiles from the Sacramento Valley may be due to: (1) west-down subsidence along the eastern margin of forearc basin; or (2) westward tilting of Late Jurassic and Early Cretaceous strata due to shortening ...
Title K-feldspar sand-grain provenance in the Triassic
... of Triassic sandstones in the NE Atlantic margin basins. K-feldspar in Lower Triassic sandstones of the Corrib gasfield, Slyne Basin, offshore west of Ireland (Figure 1) was probably sourced from Archaean and Proterozoic rocks (Tyrrell et al. 2007), indicating derivation from the north and west. The ...
... of Triassic sandstones in the NE Atlantic margin basins. K-feldspar in Lower Triassic sandstones of the Corrib gasfield, Slyne Basin, offshore west of Ireland (Figure 1) was probably sourced from Archaean and Proterozoic rocks (Tyrrell et al. 2007), indicating derivation from the north and west. The ...
Magnetization properties of intrusive/extrusive rocks from East Maio
... Figs 2 4 give a broad outline of demagnetization data, particularly for specimens that are thought to give true palaeomagnetic information (included in Table 2). The rocks are characterized by two shallow inclined axes of magnetization which are clearly discriminated by direction (see below). The mo ...
... Figs 2 4 give a broad outline of demagnetization data, particularly for specimens that are thought to give true palaeomagnetic information (included in Table 2). The rocks are characterized by two shallow inclined axes of magnetization which are clearly discriminated by direction (see below). The mo ...
An International Journal of CHAPTER 1 The Island of Elba: tectonic
... accomodated by thrust faulting of the oceanic crust. Overthrusting of serpentinites on Argille a Palombini as seen on the base of the ophiolites of the fourth Complex is another structure that could indicate active tectonism as early as the Middle Cretaceous, much before the ophiolites were accreted ...
... accomodated by thrust faulting of the oceanic crust. Overthrusting of serpentinites on Argille a Palombini as seen on the base of the ophiolites of the fourth Complex is another structure that could indicate active tectonism as early as the Middle Cretaceous, much before the ophiolites were accreted ...
Makhtesh Ramon Geological Window, hyper
... structure is seen in the sections of these dykes that are intruded into the overlying Middle Jurassic sandstone section. At such a dyke exposure two quartzite walls, 0.2 to 1.0 m thick, protrude above the ground, and when one digs at their base he reaches whitish kaolinitic rock (Fig. 64). The forma ...
... structure is seen in the sections of these dykes that are intruded into the overlying Middle Jurassic sandstone section. At such a dyke exposure two quartzite walls, 0.2 to 1.0 m thick, protrude above the ground, and when one digs at their base he reaches whitish kaolinitic rock (Fig. 64). The forma ...
Plate tectonic reconstructions and - Archimer
... thinned continental crust, slightly extending to the northwest of the high velocity body. The ECMA may be also partly caused by the edge effect due to the juxtaposition of a ~6-km thick magnetized serpentinized body and the poorly magnetized thinned continental crust. East of 56.5°W, the disconnecte ...
... thinned continental crust, slightly extending to the northwest of the high velocity body. The ECMA may be also partly caused by the edge effect due to the juxtaposition of a ~6-km thick magnetized serpentinized body and the poorly magnetized thinned continental crust. East of 56.5°W, the disconnecte ...
geological solutions concluded by petroleum geochemical data in
... period in the areas where the Vigla shales (Albian-Cenomanian), lithological member of Vigla formation, is well developed; these areas probably represent sub-basins that were preserved due to the continuation of halokinetic movements during the post-rift period. The well-documented early Toarcian OA ...
... period in the areas where the Vigla shales (Albian-Cenomanian), lithological member of Vigla formation, is well developed; these areas probably represent sub-basins that were preserved due to the continuation of halokinetic movements during the post-rift period. The well-documented early Toarcian OA ...
California terranes
... (Şengör and Dewey, 1990, and references therein; Hansen and Dusel-Bacon, 1998; Moores and Day, 1984). 3. Many tectonic models for the western United States have considered only east-dipping subduction zones, and the role of terranes in structural development of an orogen has seldom been considered ...
... (Şengör and Dewey, 1990, and references therein; Hansen and Dusel-Bacon, 1998; Moores and Day, 1984). 3. Many tectonic models for the western United States have considered only east-dipping subduction zones, and the role of terranes in structural development of an orogen has seldom been considered ...
GEOLOGY OF THE KÜTAHYA-BOLKARDAĞ BELT Abstract
... Figure 2- Stratigraphy and lithologies of the Afyon-type basement in Sömdiken Mountains to the NE of Eskişehir (simplified after Göncüoğlu et al, 2000a). Göktepe Metamorphics is constituted by schists and orthogneisses. They also include rare marble bands, graphite schist, garnet mica schist, quart ...
... Figure 2- Stratigraphy and lithologies of the Afyon-type basement in Sömdiken Mountains to the NE of Eskişehir (simplified after Göncüoğlu et al, 2000a). Göktepe Metamorphics is constituted by schists and orthogneisses. They also include rare marble bands, graphite schist, garnet mica schist, quart ...
Mesozoic
The Mesozoic Era /mɛzɵˈzoʊɪk/ is an interval of geological time from about 252 to 66 million years ago. It is also called the Age of Reptiles, a phrase introduced by the 19th century paleontologist Gideon Mantell who viewed it as dominated by reptiles such as Iguanodon, Megalosaurus, Plesiosaurus and what are now called Pseudosuchia.Mesozoic means ""middle life"", deriving from the Greek prefix meso-/μεσο- for ""between"" and zōon/ζῷον meaning ""animal"" or ""living being"". It is one of three geologic eras of the Phanerozoic Eon, preceded by the Paleozoic (""ancient life"") and succeeded by the Cenozoic (""new life""). The era is subdivided into three major periods: the Triassic, Jurassic, and Cretaceous, which are further subdivided into a number of epochs and stages.The era began in the wake of the Permian–Triassic extinction event, the largest well-documented mass extinction in Earth's history, and ended with the Cretaceous–Paleogene extinction event, another mass extinction which is known for having killed off non-avian dinosaurs, as well as other plant and animal species. The Mesozoic was a time of significant tectonic, climate and evolutionary activity. The era witnessed the gradual rifting of the supercontinent Pangaea into separate landmasses that would eventually move into their current positions. The climate of the Mesozoic was varied, alternating between warming and cooling periods. Overall, however, the Earth was hotter than it is today. Non-avian dinosaurs appeared in the Late Triassic and became the dominant terrestrial vertebrates early in the Jurassic, occupying this position for about 135 million years until their demise at the end of the Cretaceous. Birds first appeared in the Jurassic, having evolved from a branch of theropod dinosaurs. The first mammals also appeared during the Mesozoic, but would remain small—less than 15 kg (33 lb)—until the Cenozoic.