acritarch oor Spaans
acritarch
en
(paleontology, palynology) Any small, non-acid soluble (i.e. non-carbonate, non-siliceous) organic fossil that cannot be classified
Vertalings in die woordeboek Engels - Spaans
acritarco
en
small, unclassifiable organic fossil
Geskatte vertalings
Vertoon algoritmies gegenereerde vertalings
voorbeelde
Advanced filtering
Voorbeelde moet herlaai word.
Tappania is a putative eukaryotic microfossil the type acritarch found in sediments up to 1,630 million years old.
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The first large evolutionary radiation of acritarchs occurred during the Tonian.
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Because most acritarchs are thought to be marine (pre-Triassic), they are also useful for palaeoenvironmental interpretation.
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Ranges of molluscs, brachiopods, echinoderms, miomerid and polymerid trilobites, crustaceans, trace fossils, incertae sedis, foraminifers, and acritarchs have been plotted on biostratigraphical charts of the Middle Cambrian Jince Formation.
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The nature of the organisms associated with older acritarchs is generally not well understood, though many are probably related to unicellular marine algae.
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In theory, when the biological source (taxon) of an acritarch does become known, that particular microfossil is removed from the acritarchs and classified with its proper group.
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It is a roughly spherical acritarch, 30-60 μm in diameter, with one or two small necks.
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The methodology includes pollen analyses of sediments from a palaeolacustrine deposit situated at the Mazarrón littoral which has allowed the taxonomic identification of a great diversity of pollen grains and spores of vascular plants as well as non-pollen palynomorphs (fungal spores, algal zygospores, bryophyte spores, parts of exoskeleton of insects, remains and moults of dust mites, acritarchs and other palynological types of unknown biological affinity) by means of optical microscopy.
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For the top zone, the low frequencies of dinocysts and acritarchs indicate similar conditions to those currently present in the inner Bahía Blanca estuary.
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Further evidence that acritarchs were subject to herbivory around this time comes from a consideration of taxon longevity.
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Likewise, the presence of unknown taxa and the occurrence of mixed assemblages with aquatic palynomorphs (acritarchs, dynicists, spores of algae) and miospores (spores of vascular cryptogams and pollen grains) are useful in the reconstruction of the palaeoenvironmental features in a period of change in the terrestrial ecosystems which was coincident with the rise of the angiosperms.
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Palynological assemblages recovered from the Navidad Formation in outcrops of the Cordillera de la Costa, central Chile, are dominated by wood remains, cuticles, spores and pollen grains and fresh water algae (continental elements) with scarce dinoflagellate cysts, acritarchs, foraminiferal linnings marine palynomorphs) indicating that these assemblages would have been accumulated in a marine environment.
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Sudamérica. ABSTRACT Palynological assemblages recovered from the Navidad Formation in outcrops of the Cordillera de la Costa, central Chile, are dominated by wood remains, cuticles, spores and pollen grains and fresh water algae (continental elements) with scarce dinoflagellate cysts, acritarchs, foraminiferal linnings marine palynomorphs) indicating that these assemblages would have been accumulated in a marine environment.
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The whole microflora here presented is composed of 76 species, of which trilete spores are dominant and acritarchs, prasinophytes, cryptospores and chitinozoans are subordinately present.
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All the analysed samples show crystallinity index belonging to the anquimetamorphlc field. The micropaleontological studles, displayed an associatlon of Acritarchs of very simple morphology of Sphaeromorphitae type, with an important size variation and frequency of the colonial shapes.
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Diversification and expansion of acritarchs.[18]
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In general, any small, non-acid soluble (i.e. non-carbonate, non-siliceous) organic structure that can not otherwise be accounted for is classified as an acritarch.
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Paleoceanography, dinocysts and acritarchs
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The acritarchs are represented by Cobricosphaeridium spp.
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It should be noted that Palynomorphs (Plants) are all organic-walled plant microfossils including dinocysts, acritarchs, pollen, and spores.
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The blossoming of eukaryotes such as acritarchs did not preclude the expansion of cyanobacteria; in fact, stromatolites reached their greatest abundance and diversity during the Proterozoic, peaking roughly 1200 million years ago.[5]:321–3
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21 sinne gevind in 7 ms. Hulle kom uit baie bronne en word nie nagegaan nie.