Probabilistic aspects of micropaleontologic assemblage zones |
| |
| Authors: | Isamu Hattori |
| |
| Institution: | (1) Geological Laboratory, Fukui University, 910 Fukui, Japan |
| |
| Abstract: | A micropaleontologic assemblage zone is defined by occurrence of some characteristic species among many coeval species. When number of assemblage-defining species and total number of species observed are designated as Aand N,respectively, the ratio, A/N,is strongly dependent on duration of the assemblage. Theoretical consideration on the basis of a micropaleontologic cohort model shows that, when origination rate and extinction rate of species are obtained, the most reasonable ratio (A/N) and duration of the assemblage can be determined. The probabilistic model described in this paper provides a theoretical relation between the ratio and the duration. Inaccuracy in correlating micropaleontologic data to certain assemblage zones established can not be avoided because of many natural sorting and artificial biases. Ambiguity arising when data with a small number of characteristic species are correlated with a certain assemblage is numerically estimated. |
| |
| Keywords: | biostratigraphic zone species longevity assemblage duration probabilistic model correlation |
| 本文献已被 SpringerLink 等数据库收录！ |
|
