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| Taphonomy and information losses in fossil communities Lawrence, D.R. (1968). Taphonomy and information losses in fossil communities. Geol. Soc. Am. Bull. 79(10): 1315. https://dx.doi.org/10.1130/0016-7606(1968)79[1315:tailif]2.0.co;2
In: Geological Society of America bulletin. GEOLOGICAL SOC AMER, INC: New York, N.Y.. ISSN 0016-7606; e-ISSN 1943-2674
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At the present stage of our knowledge, in situ preservation is the only valid criterion we possess for recognizing fossil communities. Information losses through transport must be minimal in these cases; major losses occur through nonpreservation. Data on potential information losses through nonpreservation are not numerous. The available analyses of Recent marine communities indicate that from 7 to 67 percent of these communities' species are soft-bodied and have little potential for preservation. Fewer data exist concerning actual information losses for fossil communities of any type. Actual losses can be estimated for oyster communities from the Atlantic Coastal Plain in North Carolina. An Oligocene Crassostrea gigantissima (Finch) community at Belgrade contains about 18 preserved megascopic species. Documented processes contributing to information loss included dissipation of organic soft parts and dissolution of chitinous, siliceous, and aragonitic skeletons. A Recent minimal Crassostrea virginica (Gmelin) community from the Beaufort area includes 80 megascopic animal species. This Recent community, if subjected to the same history as the fossil one, would yield similar types and amounts of preserved information. The comparative analysis suggests, therefore, that the Oligocene community contained the same major taxa as the Recent community; over 75 percent of the species in the original Oligocene community have not been preserved. |
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