JMDMT #975 Microfossils of Cyanobacteria in Carbonaceous Meteorites
The James M. DuPont Meteorite Collection - discovered by Claus and Nagy on a Gridley-stained slide of Orgueil was shown to resemble Gridley-stained ragweed pollen (Fitch 612 Annals New York Academy of Sciences and Anders, Science, 1%., in press). The particles of simple morphology, which we said resembled mineral grains, do indeed have the chemical composi- tion of limonite (hydrated ferric oxide), according to electron microprobe analyses by Nagy, Fredriksson, Claus, Anderson, Urey, and Percy (Nature, 1963, in press), and they dissolve in acids without leaving a structured organic residue (Anders and Fitch, Science, 1962, 138: 1392). The case for their bio- logical origin now rests entirely on their featureless morphology.] H. C. Urey: Ross's findings impressed the moderator. Ross had worked with a complete stone
Channel: Education
Uploaded: November 30, 1999 at 12:00 am
Author: h4ck3rm1k3
Length: 01:15
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