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Showing 1 to 20 of 218 for “"Jurassic"”.
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Palynological insights into the Mid Jurassic dinoflagellate radiation
… record indicates that the Bajocian of the Mid Jurassic (~170–168 Ma) represents a critical interval in dinoflagellate evolutionary history, marked by a rapid increase in the diversity of cysts from the family Gonyaulacaceae. From the Bajocian onwards, the Gonyaulacaceae have remained one of the …
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Synapsid Burrows in the Lower Jurassic Navajo Sandstone, Utah
… structures below interdune deposits of the Lower Jurassic Navajo Sandstone near Moab, Utah are interpreted as synapsid burrows based on similar morphologies to fossil and extant synapsid burrows. Two types of burrows are distinguished by their size. Type I burrows are large diameter and comprise …
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Middle and Upper Jurassic bivalves from the Iberian Range (Spain)
Previous work on Jurassic bivalves from the Iberian Range is reviewed, whereby emphasis is placed on Callovian-Kimmeridgian species. The taxonomy, distribution pattern and ecology of the bivalve fauna occurring in Middle and Upper Jurassic rocks of the Aragonian Branch of the Iberian Range have …
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Extinction and recovery dynamics of Triassic-Jurassic macro-invertebrate communities
… the marine fauna from the Late Permian to Early Jurassic. The ecospace can be represented as a combination of the three axes of tiering, motility and feeding, each divided into six subcategories. From the Cambrian to Recent, ecospace utilisation has tripled, however the trend through the …
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Jurassic stratigraphy of the southern two-thirds of North Dakota
<p>Jurassic rocks in the southern two-thirds of North Dakota consist mainly of limestone, shale, anhydrite, and salt of the Piper Formation; shaly limestone, calcareous and non-calcareous shales of the Rierden Formation; shale and sandstone of the Swift Formation; and, at the top, non-marine shale …
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Microevolutionary patterns in some Jurassic bivalves of the Oxford Clay, England
Over 10,000 bivalves were collected to investigate the microevolutionary patterns in the Peterborough Member of the Oxford Clay Formation. Two main bivalve lineages were studied <i>Meleagrinella braamburiensis</i> and <i>Mesosaccella morrisi</i>. <i>M. braamburiensis</i> was a thin-shelled …
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High-resolution environmental change in the late Jurassic Kimmeridge clay formation
Several discrete intervals of the Late Jurassic Kimmeridge Clay Formation were analyzed to assess the high-resolution environmental change, which occurs within laminated lithologies. The material was from new boreholes drilled in Dorset, southern England, for the Rapid Global Geological Events …
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Carbonate Bodies Within the Basal Swift Formation (Jurassic) of Northwestern North Dakota
… bodies of the basal Swift Formation (Upper Jurassic) occur as anomalous deflections on a relatively uniform mechanical well log section. The areal distribution, stratigraphic relationships, and genesis of the carbonate bodies were determined by using the gamma ray log, the …
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Paleomagnetism of Late Triassic and Jurassic sediments of the southwestern United States.
… through Pliensbachian stages of the Early Jurassic, the pattern of APW changed to an eastward progression. Even after correction for 4° clockwise rotation of the Colorado Plateau, a sharp corner in the APW path (J1 cusp) is resolved near the pole from the Hettangian/Sinemurian (∼200 Ma) …
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Jurassic park--the thesis : simulation of dinosaur social behavior using behavior networks
Thesis: B.S., Massachusetts Institute of Technology, Department of Mathematics, 1993
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Hombres de Steven Spielberg: un análisis de la representación de masculinidades en los textos fílmicos "Duel", "Jaws", "Jurassic Park", "The Lost World: Jurassic Park" y "War of the Worlds"
… al mismo. El corpus lo forman Duel, Jaws, Jurassic Park, The Lost World: Jurassic Park y War of the Worlds, y coincide con el agrupamiento que Lester Friedman (2006: 123-124) hace de esta películas, catalogándolas como pertenecientes al género de monstruos. Se sigue un método …
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Triassic-Jurassic biochronology of the eastern Iskut River map area, northwestern British Columbia
Norian to Early Callovian faunas in the eastern half of the Iskut River map area can be divided into three suites: a benthonic fauna consisting of bivalves, corals, and gastropods; a planktonic fauna of radiolarians; and a nektonic fauna of coleoids and ammonoids. The ammonoids (27 genera, 47 …
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The sedimentology and lithostratigraphy of the Upper Jurassic Lourinha formation, Lusitanian Basin, Portugal
… the Triassic.<br></br><br></br>During the Late Jurassic rifting phase in the development of the Lusitanian Basin marine shelf and slope systems were replaced by alluvial fan and fluvial environments which prograded from the nonh during the late Kimmeridgian. Continental environments, …
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Microfaunal investigation of the Early Toarcian (Lower Jurassic) extinction event in N.W. Europe
The Early Jurassic was a time of rapidly rising sea-level associated with the extensive spread of anoxic bottom waters. Sea-level rise across the Pliensbachian - Toarcian boundary culminated in the falciferum Zone of the Toarcian and is one of the best authenticated eustatic events in the Jurassic. …
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Upper Jurassic (Oxfordian) Smackover facies characterization at Little Cedar Creek Field, Conecuh County, Alabama
The Upper Jurassic (Oxfordian) Smackover Formation is a shallow-marine carbonate unit in the subsurface of the U.S. Gulf Coast, spanning from south Texas to west Florida. This field case-study focuses on Little Cedar Creek Field located in southeastern Conecuh County, Alabama. The objectives of …
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A palynological investigation of Upper Jurassic basal Cretaceous sediments from England, France and Iberia
… interval. Earlier studies concerning Upper Jurassic and Lower Cretaceous microplankton are reviewed in light of the present study. Although the above biostratigraphic units are mainly of local stratigraphic value only, the observations and results presented here have been substantiated and …
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Biodiversity crisis and recovery during the Triassic-Jurassic greenhouse interval: testing ocean acidification hypotheses
… aspinata collected from Triassic and Jurassic rocks from two locations in southwest England. Palaeotemperature was reconstructed from examination of these fossils and from the literature and atmospheric pCO2 estimated from published accounts. The shell size of bivalves increased during …
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Controls on Carbonate Factory Distribution in a Restricted Intraplatform Basin: Upper Jurassic Smackover, Southwest Alabama
… and depositional facies of the Upper Jurassic Smackover Formation in the Manila Basin, southwest Alabama, and examines the carbonate factories responsible for sediment production. Four wells with associated cores and log data were analyzed, alongside geochemical proxy concentrations …
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