How To Use Microfossil In A Sentence
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The dissolution of limestones in weak acid is now a standard palaeontological laboratory technique, and has been used extensively to isolate phosphatic microfossils of all types from Paleozoic carbonates.
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McKay no longer argues as strenuously that the tiny microfossil is an important part of his case, because he is finding what he believes are much larger Martian microbes in other meteorites.
First Contact
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Other phosphatic and phosphatized microfossils were recovered by dilute acetic acid digestion.
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This agreement among biostratigraphers for the placement of the KT boundary in the Brazos section alone shows that evidently biostratigraphy works very well across different microfossil groups.
Should Keller's Thin Sections Be Independently Tested? « Climate Audit
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The formation has yielded numerous fossils of stromatolites in addition to microfossils.
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They are generally common microfossils in Phanerozoic marine sedimentary rocks, at least from the early Middle Ordovician onward.
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Microfossil assemblages from rare black and grey clays in this succession contain only a variety of seeds, Microcarpolithes hexagonalis and megaspores, and there are neither foraminifera nor other marine microfossils.
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Brasier et al., however, questioned the biogenic validity of microfossils from the early Archaean Apex Chert in Australia and suggested that they may be artefacts created by abiogenic processes.
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The key to understanding the early evolution of eukaryotes lies in the Proterozoic fossil record, especially microfossils.
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Then he puts up an image of a microfossil from the Murchison meteorite and it looks quite like the first, including the presence of trichomes or strands of cells in sheaths, and later he shows images from Murchison very similar to those stacks of dimes.
First Contact
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Boundaries between the formations are all conformable but, in the absence of ammonites or microfossils, age control is not precise.
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Microbes can flash fossilize and presto, you can have a microfossil that registers as extraterrestrial when it was alive on Earth not that long before.
First Contact
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Pseudocolumnar and mound-shaped stromatolites, or stromatoloids, are known from five locations, with filamentous and pillar-shaped microfossils detected from a stromatolite (or stromatoloid) in the lower part of the Snowslip Formation (Horodyski, 1977, 1983a, 1985a, 1993a,b).
Glacier National Park Geology & Paleontology: Part 5 - Snowslip & Shepard
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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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Nor were these the only marine groups who left Jurassic microfossils.
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A good case has already been made for bacteria microfossils in a Martian meteorite.
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Steve's microfossil search achieved success: he found a fossil ostracod!
MDRS-88 sol 6: Life on Mars
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We went to the Rajahmundry area because volcanic layers, called traps … are found in this area interbedded in shallow marine sediments that contain microfossils, which yield age control," explained geologist Gerta Keller of Princeton University.
Dinos Doomed by Mega-Eruption, Not Meteor? | Impact Lab
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Palaeobotany includes not only macrofossil plants but also microscopic plant material that may be included in palynology, the study of fossil spores and pollen and other organic-walled microfossils.
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McKay did report the possibility that the meteorite contained a Martian “microfossil”—the minute remains of the outer sheath of a bacterium—but his strongest results involved the presence of minerals and rock alternations that are considered signs that bacteria and other microbes were once at work eating the rock, transforming the rock, and depositing waste in the rock.
First Contact
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So how do McKay and others determine whether a microfossil is from beyond Earth or is simply terrestrial contamination?
First Contact
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We went to the Rajahmundry area because volcanic layers, called traps … are found in this area interbedded in shallow marine sediments that contain microfossils, which yield age control," explained geologist Gerta Keller of Princeton University.
Dinos Doomed by Mega-Eruption, Not Meteor? | Impact Lab
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Microbes can flash fossilize and presto, you can have a microfossil that registers as extraterrestrial when it was alive on Earth not that long before.
First Contact
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These fossils include graptolites, trilobites, and various types of microfossils visible only under the microscope.
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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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The spherules were previously interpreted as microfossils (Vallenia sp.) because of their spheroidal shapes and inclusions of carbonaceous matter.
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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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The dissolution of limestones in weak acid is now a standard palaeontological laboratory technique, and has been used extensively to isolate phosphatic microfossils of all types from Paleozoic carbonates.
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For example, chrysophyte microfossils were absent or rare in Sawtooth Lake (Ellesmere Island, 79° N) over the past 2,500 years but suddenly became abundant 80 years ago.
Historical changes in freshwater ecosystems in the Arctic
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In this paper, we discuss the oxygen content of the Late Cretaceous sea water by means of microfossil proxies .
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Microfossil assemblages from rare black and grey clays in this succession contain only a variety of seeds, Microcarpolithes hexagonalis and megaspores, and there are neither foraminifera nor other marine microfossils.
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Not surprisingly, “proof of life on Mars” is the way the story played when it came out with a bang in 1996, and the “microfossil” was the star of the show.
First Contact
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Sediments from the Oliva host contained coarse sand and microscopic shell fragments but no complete microfossils.
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Once they have sketched the outlines of the basic chronology, geochemistry and geography, the rest will probably fall, microfossil by microfossil.
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Micropalaeontology is the study of microfossils, a microfossil being any fossil that is best studied by means of a microscope.
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The formation has yielded numerous fossils of stromatolites in addition to microfossils.
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Fortunately we have completed all of the suit study trials, have collected a bunch of rock samples for the microfossil and extremophile studies, and have finished work on the telescope, so we are in good shape, but there's still plenty of data analysis to do on those projects and lots of GPS tracking and geotagging yet to do.
Reminder: Paul's and Laksen's blogs
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“Raman imaging spectroscopy of a purported 3.5 billion year old microfossil” abstract.
First Contact
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Nonetheless, in the time since the paper first came out to such acclaim and criticism, many living organisms as small as the reported Allan Hills microfossil have been identified and categorized on Earth.
First Contact
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Conodont elements, the disarticulated bony remains of the complex conodont oral apparatus, are found as microfossils by the tens of thousands in virtually every Paleozoic marine sediment, everywhere in the world.
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These microfossils, found in bedded carbonaceous cherts, are estimated to be between 3.3 billion to 3.5 billion years old.
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This microfossils are accompanied by bivalves and marine gasteropods.
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A total of 772 samples have been analysed for microfossils from the proximal Cretaceous succession of the Orange Basin during the past 10 years.
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An astonishing diversity of unicellular microfossils has been discovered in 800-million-year-old rocks from Victoria Island.
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These are the finest ultrastructure details thus far found in microbes preserved by hydrothermal mineralization, and can be used as an aid to identify microfossils.
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A mid-Albian age has been recorded from marine planktonic microfossils found in limestones at the lower levels of the Las Chilcas Formation.
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During that first year in the oil business, Smith shared an office with a paleontologist who worked with the microfossils (mostly foraminifera) that are used to age-date the rock units of the Texas Gulf Coast.
