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Preservational effects in paleoecological studies: Cretaceous mollusc examples

  • Carl F. Koch (a1) and Norman F. Sohl (a2)


The effect of preservational quality on paleoecologic studies is evaluated quantitatively by using data from 83 fossil collections. These collections are from a restricted Cretaceous time interval (Haustator bilira Assemblage Zone) of Maestrichtian Age and are from the Eastern Gulf Coastal Plain Province. In all, 32,335 specimens were identified, resulting in recognition of 643 different taxa. Each collection was categorized into one of six preservational types, ranging from those in which both aragonite and calcite shells are well preserved to those having only calcite shells preserved.

Statistical comparisons reveal that preservation affects the faunal makeup of these collections. Specifically, collections in which both aragonite and calcite are well preserved have more taxa than collections of poorer preservational quality and contain faunal elements not found in other collections.

These two effects can confound paleoecologic studies of endemism, eurytopy vs. stenotopy, species longevity and other studies of the distribution of organisms in space and time. These effects are especially significant for studies based on presence/absence data, such as published faunal lists and selectively collected samples. In such studies, collections of good preservational quality may be interpreted to represent strata of high diversity, taxa having the more durable hard parts will appear to be widespread and long ranging, and taxa that are preserved only in collections of the best preservational quality will appear stenotopic, endemic, and rare.



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Buzas, M. A., Koch, C. F., Culver, S. J., and Sohl, N. F. 1982. On the distribution of species occurrence. Paleobiology. 8:143150.
Chave, K. E. 1967. Skeletal durability and preservation. Pp. 377387. In: Imbrie, J. and Newell, N. D., eds. Approaches to Paleobiology. John Wiley and Sons; New York.
Davis, J. C. 1973. Statistics and Data Analysis in Geology. 550 pp. John Wiley and Sons, Inc.; New York.
Gardner, J. A. 1916. Systematic paleontology, Mollusca. Pp. 371733. In: Clark, W. B. and others, eds. Upper Cretaceous. Maryland Geol. Surv.; Baltimore.
Hansen, T. A. 1978. Larval dispersal and species longevity in lower tertiary gastropods. Science. 199:885887.
Jablonski, D. 1980. Apparent versus real biotic effects of transgressions and regressions. Paleobiology. 6:397407.
Kauffman, E. G. 1967. Coloradoan macroinvertebrate assemblages, Central Western Interior, United States. Pp. 67143. In: Paleoenvironments of the Cretaceous Seaway in the Western Interior. Colorado School of Mines; Golden, Colorado.
Koch, C. F. 1980. Bivalve species duration, areal extent and population size in a Cretaceous sea. Paleobiology. 6:184192.
Lawrence, D. R. 1968. Taphonomy and information losses in fossil communities. Geol. Soc. Am. Bull. 79:13151330.
Nie, N. H., Hull, C. H., Jenkins, J. G., Steinbrenner, K., and Bent, D. H. 1975. Statistical Package for the Social Sciences. 675 pp. McGraw-Hill Book Co.; New York.
Preston, F. W. 1948. The commonness and rarity of species. Ecology. 29:245283.
Sanders, H. L. 1968. Marine benthic diversity: a comparative study. Am. Nat. 102:243282.
Sohl, N. F. 1960. Archeogastropoda, Mesogastropoda, and stratigraphy of the Ripley, Owl Creek, and Prairie Bluff Formations. U.S. Geol. Surv. Prof. Pap. 331-A:1151.
Sohl, N. F. 1964. Neogastropoda, Opisthobranchia, and Basommatophora from the Ripley, Owl Creek, and Prairie Bluff Formations. U.S. Geol. Surv. Prof. Pap. 331–B:153344.
Sohl, N. F. 1977. Utility of gastropods in biostratigraphy. Pp. 519539. In: Kauffman, E. G. and Hazel, J. E., eds. Concepts and Methods of Biostratigraphy. Dowden, Hutchinson and Ross, Inc.; Stroudsburg, Pa.
Stephenson, L. W. 1914. Cretaceous deposits of the eastern Gulf region and species of Exogyra from the eastern Gulf region and the Carolinas. 55 pp. U.S. Geol. Surv. Prof. Pap. 81.
Stephenson, L. W. 1923. Cretaceous formations of North Carolina. 604 pp. North Carolina Geol. and Econ. Surv.5.
Stephenson, L. W. 1933. The zone of Exogyra cancellata traced twenty-five hundred miles. Am. Assoc. Petrol. Geol. Bull. 17:13511361.
Stephenson, L. W. 1941. The larger invertebrate fossils of the Navarro Group of Texas. 641 pp. Univ. Tex. Publ. 4101.
Stephenson, L. W. 1955. Owl Creek (Upper Cretaceous) fossils from Crowleys Ridge, southeastern Missouri. U.S. Geol. Surv. Prof. Pap. 274-E:97140.
Stephenson, L. W. and Monroe, W. H. 1940. The Upper Cretaceous deposits. 296 pp. Mississippi State Geol. Surv. Bull. 40.
Tipper, J. C. 1979. Rarefaction and rarefiction: the use and abuse of a method in paleoecology. Paleobiology. 5:423434.
Weller, Stuart. 1907. Cretaceous faunas. 1106 pp. New Jersey Geol. Surv. Paleontology 4.
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