词汇 | foraminifera |
释义 | BETA Examples of foraminiferaforaminifera isn’t in the Cambridge Dictionary yet. You can help! The plates consist of line drawings of commonly occurring species but it would have been nice to see some photos of what foraminifera and thecamoebians really look like too. Ten samples are completely devoid of planktonic foraminifera and in many cases only very rare planktonic forms have been observed; scattered washed residues may, however, contain rich and well-preserved assemblages. Bioclastic limestone blocks contain shell fragments, benthic foraminifera, microbial carbonate, pisoliths and micritic intraclasts. The marine sedimentary units have been dated by invertebrate fossils and, mainly those units exposed in the southern part of the region, by foraminifera as well. Ser pulids, brachiopods, echinoderms, corals, stromatoporoids, bryozoans and textularian foraminifera are less abundant. However, foraminifera are important in four and three are concerned with conodonts. The limestones are grey, marly and strongly schistosed or, locally, dark grey, more pure and better preserved, containing abundant benthic foraminifera. Whilst 36 samples were investigated for nannofossils and 63 for planktonic foraminifera, only those samples yielding age-diagnostic taxa are represented here. On a larger scale, symmetry is a feature of the overall body plans of many organisms, from microscopic foraminifera to large vertebrates. The limestone has a micritic matrix and contains benthic foraminifera of variable size. The original sediment source (calcareous/nannofossil oozes) for the foraminifera was dissociated in de-ionized water without agitation, normally for a period of 24 hours. The mean size of planktonic foraminifera slightly increases in the upper part of the zone. Furthermore, the dinoflagellates will have proliferated immediately upon arrival with the surface water ingression, whereas the benthic foraminifera will have required conditions to stabilize before colonizing the bottom substrate. Forward modeling of carbonate proxy data from planktonic foraminifera using oxygen isotope tracers in a global model. |
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