JMDMT #405 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - characteristic of algae than of aquatic fungi. Among the larger nonseptate filaments very occasionally forms have been observed in which the lumen of the filament contains numerous spherical sporelike bodies. In living organisms a somewhat...
JMDMT #402 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection -is caused by the abundance of finely disseminated organic matter that appears light amber to dark brown in color in sections 50 /x or less in thickness. In this respect the chert behaves petrographically much as a typical bituminous coal, which in...
JMDMT #386 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - alone can account for Xannoconus? The nearest ap- proach to a regular type of inorganic carbonate deposit is the example of oolites. These may be radiate in internal structure or bear concentric bands around a nucleus. In size range, oolites are...
JMDMT #385 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - Circular types were spherical in life. Elongate, conical, and subovate types do have an axial canal. The size and configuration of axial canal and basal cavity could be a function of compression of an original sphere. Although this can account for...
JMDMT #382 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - collection permits ulti- mate resolution of assignment.' •'"- The microfossil Xamioconus kanipliicr, 1931, is a good example. The object ranges from 5 to 50 /u in length, with an average of 15 to 20 fx; width varies from 5 to 15 /x. It is...
JMDMT #376 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - is a tendency to increase the number of radial spines from 3 or 4, to 6, 8, and 10. That trend clearly de- notes the adaptive value of particular skeletal modification. Miscellaneous Protists In this section, bacteria and lime secreting algae will...
JMDMT #368 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - like Coccochrysis, Discosphaera, or Syracosphaera and CoccoUlhus and observe a subovate configuration in the first and third and a more spherical form in the second and fourth. Lohman- figures several different species of Pontospliaera,...
JMDMT #366 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - outside the cyst wall. In the cyst of Microglena, Conrad has distinguished "numerous minute lens-shaped masses of silica" embedded in an outer layer of pectic substances. A delicate, inner smooth layer of cellulose underlies this outer layer. This...
JMDMT #365 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection - (CO2) in the environs was thought to be the causative factor . Classes Chrysophyceae, Coccolithophorida, and Silicoflagellata The several flagellates cited in the subtitle of this section, with the diatoms discussed earlier, constitute the phylum...
JMDMT #357 Microfossils of Cyanobacteria in Carbonaceous Meteorites
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The James M. DuPont Meteorite Collection -some useful insights into radiolarian morphology. Free floating radiolarians, among both fossil and living assemblages, tend to be spherical and elliptical, with a foamy or spongy appearance. Such forms occur in the Spumellina, Nasselina, and...
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