Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"Radiolaria"”.
-
Vertical flux, ecology and dissolution of radiolaria in tropical oceans : implications for the silica cycle
Radiolarians which settle through the oceanic water column were recovered from three stations (western Tropical Atlantic-Station E, central Tropical Pacific-Pi and Panama Basin-PB) using PARLUX sediment traps in moored arrays at several depths. The taxonomic diversities of the radiolarian …
-
Middle and upper jurassic foraminifera and radiolaria of Scotland : an integrated biostratigraphical and palaeoenvironmental approach
… analysis of foraminiferal and radiolarian distribution from all the major Middle and Upper Jurassic marine deposits of Scotland. These sampled sites are divided between two basins with Staffin Bay and Bearreraig Bay within the Inner Hebrides Basin, North West Scotland; and …
-
Vertical flux, ecology and dissolution of radiolaria in tropical oceans : implications for the silica cycle
Radiolarians which settle through the oceanic water column were recovered from three stations (western Tropical Atlantic-Station E, central Tropical Pacific-P1 and Panama Basin-PB) using PARFLUX sediment traps in moored arrays at several depths. The taxonomic diversities of the radiolarian …
-
RADIOLARIAN BIOSTRATIGRAPHIC AND PALEOCEANOGRAPHIC STUDIES OF MONTEREY-LIKE ROCKS OF THE HUMBOLDT BASIN, NORTHERN CALIFORNIA
… have been investigated for the presence of radiolarian fauna. The vast majority of the radiolaria found are cold water indicators, however there are four distinct periods of invasion of warm water fauna. Two minor ones occurring at 11.5ma and approximately 8.0ma and two major events at 5.0ma …
-
The Microbiostratigraphy of the Paiaeocene of the Northwest European Continental Shelf
… which comprised 5 genera, Diatomacea 2 and Radiolaria 1. The recorded taxa are diagnosed and their stratigraphic and palaeoenvironmental significance discussed. The samples range in age from Late Cretaceous (Maastrichtian) through Paiaeocene (Danian & Thanetian) to Early Eocene (Ypresian) …
-
The chemistry, biology, and vertical flux of oceanic particulate matter
… Foraminifera, diatoms, silicoflagellates, Radiolaria, and tintinnids were made by light microscopy (LM) and augmented by scanning electron microscopy (SEM). Size and morphological distributions of the >53 μm particles, especially Foraminifera, Acantharia, fecal pellets, and fecal matter …
-
Foraminifera from outcrops of the Pierre Shale (Upper Cretaceous) of North Dakota
… known to the writer, include Foraminifera, Radiolaria, sponge spicules and Ostracoda. It was hoped that a study of the Foraminifera would provide a basis and illustrate the affinity to the Pierre of calcareous, buff colored strata that crop out in the valley of the Sheyenne River, from North …
-
Petrographic and petrophysical characterization of the Eagle Ford Shale in La Salle and Gonzales counties, Gulf Coast Region, Texas
… although echinoderms, bivalves, fish bones, radiolaria, coccoliths and calcispheres are also present. This diversity in microfossils reinforces the cyclic character of the Eagle Ford. Contrary to the commonly believed idea that marine transgression implies deep marine anoxic conditions, this …
-
Silica diagenesis and its pore-scale influence on the characteristics of the upper and lower Bakken shales, Williston Basin, North Dakota and Montana
… portion of biogenic silica in the form of radiolaria. Biogenic silica dissolution and reprecipitation is known to contribute to the development and/or preservation of pore space, ultimately affecting source rock quality and reservoir recoverability. In general, silica diagenesis occurs in …
-
A molecular approach to questions in the phylogeny of planktonic sarcodines
The Acantharea and the Polycystinea are two classes of sarcodines (Sarcodina) which are exclusively planktonic and occur strictly in oligotrophic marine environments. Although these protists have been the topic of research since Ernst Haeckel's systematic investigations of samples from the H. M. S. …
-
The metamorphic sheet and underlying volcanic rocks beneath the Semail ophiolite in the northern Oman mountains of Arabia
… are probably Middle Cretaceous in age (from radiolaria in interbedded cherts) and may be related to the initiation of a subduction zone in the Cretaceous. prior to ophiolite formation and emplacement.<br></br><br></br> Metamorphic rocks showing an inverted metamorphic zonation from upper …
-
Tephrostratigraphy, petrography, geochemistry, age and fossil record of the Ganigobis Shale Member and associated glaciomarine deposits of the Dwyka Group, Late Carboniferous, southern Africa
… crinoid stalks, sponges and sponge spicules, radiolaria, coprolites and permineralised wood. These mostly marine body and trace fossils record the extent of the first of a series of marine incursions into the disintegrating Gondwanan interior as early as the Carboniferous. Within the Ganigobis …
-
The ecology of colonial radiolarians : their colony morphology, trophic interactions and associations, behavior, distribution, and the photosynthesis of their symbionts
Colonial radiolarians (Spumellaria) are among the most common and abundant large zooplankton, but they have been little studied by modern biologists. Colonies were found on 98% of epipelagic diving stations in the period from 1977 to 1979. Measured abundances ranged from .04 to 540 colonies per m3. …