Automated Stratigraphic Correlation by F. P. Agterberg

By F. P. Agterberg

This booklet offers an creation to fresh advancements in computerized stratigraphic correlation of fossil information, utilizing laptop courses for score and scaling of stratigraphic occasions. Mainframes or microcomputers can be utilized to assist the stratigrapher in the course of facts stock for a zone or period of time, for building of a biozonation in line with stratigraphic occasions, (such because the most modern visual appeal datum of a fossil species), and for computerized correlation. The e-book is meant for complex geology scholars, examine staff and lecturers with a heritage in stratigraphy and an curiosity in utilizing computer-based thoughts for problem-solving.

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0 I Plio-Pleistocene 1 1 Miocene 20 - 0 Oligocene Y Eocene 50 60 70 i I I Crelaceour ’O’ Fig. 3 Comparison of the magnitudes of sea level events of the Tertiary as inferred by Vail et al. (1977) from seismic stratigraphy, and the composite benthic 6 1 8 0 record according to Miller and Fairbanks (1985). The encircled numbers refer to particular rises and falls examined by Williams et al. (1988). 1. may yield results that are significantly different. For example, Odin (1982) estimated the age of the Jurassic-Cretaceous boundary at 130 f 3 Ma but Harland et al.

30 ft or 10 m) along a well in exploratory drilling, the highest occurrences of two taxa with overlapping frequency curves may be observed to be coeval. The fact that two taxa have observed highest occurrences in the same sample does not necessarily mean that they disappeared at the same time. 12 are likely to have wider ranges for their highest occurrences. / OBSERVED HIGHEST OCCURRENCE R E L A T I V E T I M E SCALE Fig. 12 Schematic diagram representing frequency distributions for relative abundance (broken lines) and location of observed highest occurrence (solid lines) for two taxa.

Imposing the artificial range truncation model illustrated in Fig. 118 on the pattern of Fig. 11A produces the apparent gradual decline in diversity of Fig. 11C. Cretaceous-Tertiary boundary). 1 1B plots a n arbitrary probability curve giving the probabilities of different degrees of range truncation. 11C. 6B continues to increase until the time of the mass extinction. Different sedimentary sections would be characterized by different curves. 11B is representative for nearshore marine and terrestrial sections, the deep sea plankton record would have a curve whose slope increases less initially and becomes steeper near the time of the mass extinction (Signor and Lipps, 1982, p.

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