How To Use Radiolaria In A Sentence
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To obtain a precise stratigraphic range for the radiolarian fauna, biostratigraphic analysis on the co-occurring microfossils, conodonts, chitinozoans, and graptolites, was also carried out.
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Sedimentation characterized by radiolarian-bearing red mudrocks is typical of the interval between the sulphide layer and the flysch of the Culm.
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The discovery of the radiolarian fossils has great significance for the stratigraphic division and correlation of the Triassic and study of tectonic evolution in the northern Qiangtang area.
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This contradiction cannot be resolved at present due to a lack of Cambrian radiolarian studies, which are needed to provide chronostratigraphic corroboration.
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Now, he and his team at the University of Bielefeld, Germany, inspired by the microscopic marine organism, radiolaria, are building shell-like structures that might one day form the building blocks of such devices.
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These zooxanthellae may be found in many marine invertebrates, including sponges, corals, jellyfish, and flatworms, as well as within protists, such as ciliates, foraminiferans, and colonial radiolarians.
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Calcareous oozes are common in the low and mid-latitudes while in other places, particularly the high latitudes, radiolarian oozes tend to dominate.
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Between 1859 and 1866, he worked on many ‘invertebrate’ groups, including radiolarians, poriferans and annelids (segmented worms).
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The sequence includes tuffaceous sandstone, andesitic sandstone and radiolarian chert.
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At the present time there are a number of divergent opinions concerning the paleoecology of radiolarians.
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Tube walls have simple pores and are constructed of radiolarian and foraminiferan tests, sand grains and/or fragments of sponge spicules, connected by a cement of some kind.
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Won regarded the hollow canal structure as one of the indicators of the close relationship of radiolarians and the Porifera.
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Briefly, there are four types of ooze: red clay, globigerina ooze, radiolarian ooze, and pteropod ooze.
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Research on radiolarians in China for samples from sea started in late 50' of the twentieth century, lagging behind the oversea radiolarian study for more than one century.
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It is also noteworthy that these radiolarians generally have quite fine frameworks and thin shell walls, resulting in semitransparent specimens.
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This indicates that there existed a short period of radiolarian development before the great extinction at the Permian-Triassic transition.
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Subsequently the massive sulfide deposit and surrounding metalliferous sediment apron were covered by oceanic radiolarian chert sediments.
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All radiolarians secrete strontium sulphate at some point in the life cycle - as the adult shell in Acantharea, and as crystals in ‘swarmer cells’ produced during asexual reproduction in Polycystinea.
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Between 1859 and 1866, he worked on many "invertebrate" groups, including radiolarians, poriferans (sponges) and annelids (segmented worms).
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Also, other microfossils such as diatoms, radiolaria, and planktonic and benthic foraminifera are useful in certain parts of the Palaeocene.
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Older Palaeozoic rocks are represented by greenish grey slates from the sides of the Beardmore glacier and by radiolarian cherts; but the most widespread of the sedimentary rocks occurring in vast beds in the mountain faces is that named by Ferrar the Beacon sandstones, which in the far south Shackleton found to be banded with seams of shale and coal amongst which a fossil occurred which has been identified as coniferous wood and suggests that the place of the formation is Lower Carboniferous or perhaps Upper Devonian.
Perspective of Antarctica in 1911
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Therefore, in terms of geological age determined by radiolarians and the ammonoid, this brachiopod fauna should be assigned to the latest Changhsingian.
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Similarly, among protists, a radiolarian may capture and ingest, more or less indifferently, a bacterium, an autotrophic flagellate, a herbivorous oligotrich ciliate, or another radiolarian (Fig 2E).
Marine microbes
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These zooxanthellae may be found in many marine invertebrates, including sponges, corals, jellyfish, and flatworms, as well as within protists, such as ciliates, foraminiferans, and colonial radiolarians.
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It contains a large number of mostly amoeboid organisms, including such significant groups as the radiolarians and foraminiferans.
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These micro-organisms are found in just a few pieces of amber among the thousands that have been studied, but show a remarkable diversity: unicellular algae, mainly diatoms found in large numbers, traces of animal plankton, such as radiolaria and a foraminifer, spiny skeletons of sponges and of echinoderms.
Signs of the Times
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This, indeed, is why oil companies employ fossil experts to identify particular strata of rocks, usually by microfossils, tiny creatures called foraminifera, for example, or radiolaria.
THE GREATEST SHOW ON EARTH
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Well-preserved Late Cambrian radiolarian faunas were recovered from carbonate rocks of the Cow Head Group of the Great Northern Peninsula of the island of Newfoundland, Canada.
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Like other radiolarians, Acantharea have an elaborate mineralized skeleton.
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The nearest analogue to this remarkable partnership is to be found in the vegetable kingdom, where, as the researches of Schwendener, Bornet, and Stahl have shown, we have certain algæ and fungi associating themselves into the colonies we are accustomed to call lichens, so that we may not unfairly call our agricultural Radiolarians and anemones
Scientific American Supplement, No. 324, March 18, 1882
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Similarly, among protists, a radiolarian may capture and ingest, more or less indifferently, a bacterium, an autotrophic flagellate, a herbivorous oligotrich ciliate, or another radiolarian (Fig 2E).
Marine microbes
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Thus, the viruses which attack the autotrophic prokaryotes Synechococcus, the bacteria which absorb dissolved organic excreted by autotrophic protists such as diatoms and dinoflagellates, and the protists such as ciliates, radiolarians which feed on autotrophic protists are all consumers of primary production.
Marine microbes
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However, because of the morphological differences between modern radiolarians and ancient ones, it is difficult to reconstruct precisely the ecology of ancient radiolarians.
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The team did not limit themselves to foraminifera but used other planktonic groups such as the coccoliths and radiolaria.
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Twenty-two samples for radiolarian research were collected from the grayish black, thin-bedded limestone and siliceous limestone of the Baoqing Member and the Mcishan Member.
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The specimen brought up was a terrigenous blue mud (glacial deposit) with some radiolaria.
South: the story of Shackleton’s last expedition 1914–1917