Mathematics – Logic
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10416437w&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue E7, p. 16437-16450
Mathematics
Logic
27
Oceanography: Biological And Chemical: Microbiology, Planetology: Solid Surface Planets: General Or Miscellaneous, General Or Miscellaneous: New Fields (Not Classifiable Under Other Headings)
Scientific paper
In an attempt to establish reliable criteria for the identification of potential fossil life in extraterrestrial materials, the fossilizable characteristics of bacteria, namely, size, shape, cell wall texture, association, and colony formation, are described, and an overview is given of the ways in which fossil bacteria are preserved (as compressions in fine-grained sediments; preservation in amber; permineralized by silica; replacement by minerals such as silica, pyrite, Fe/Mn oxides, calcite, phosphate, and siderite; or as molds in minerals). The problem of confounding minerally replaced bacteria with non biological structures having a bacterial morphology is addressed. Examples of fossilized bacteria from the Early Archaean through to the Recent are used to illustrate the various modes of preservation and the morphology of fossil bacteria.
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