Automated Stratigraphic Correlation by F. P. Agterberg

By F. P. Agterberg

This e-book presents an creation to contemporary advancements in computerized stratigraphic correlation of fossil info, utilizing laptop courses for rating and scaling of stratigraphic occasions. Mainframes or microcomputers can be utilized to assist the stratigrapher in the course of information stock for a area or period of time, for development of a biozonation in accordance with stratigraphic occasions, (such because the most modern visual appeal datum of a fossil species), and for computerized correlation. The ebook is meant for complex geology scholars, learn staff and lecturers with a heritage in stratigraphy and an curiosity in utilizing computer-based suggestions for problem-solving.

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A zone is a body of strata commonly characterized by the presence of certain fossil taxa. , 1976): (1) assemblage zone ----- a group of strata characterized by a distinctive 21 interval zone I 11 - 'I1 concurrent rangezone range zone assemblage zone B assemblage zone A multi-taxon concurrent range zone Fig. 1 Types of zones commonly used for biostratigraphic correlation (simplified from Hedberg, Editor, 1976). See text for further explanation. assemblage of fossil taxa; (2) range zone ----- a group of s t r a t a corresponding t o the stratigraphic range of a selected taxon in a fossil assemblage; (3) concurrent range zone ----- the overlapping part of the range zones of two or more selected taxa.

G. from micropaleontological information in oil exploration). The following quotations from Schindewolf (1950, p. 79-80) as translated by Jeletzky (1965, p. 139) for relation between quantitative “faunal” and qualitative 27 “species zone” methods remain valid to-day as a summary for the relation between quantitative and qualitative methods: “It would seem to me that there is no need to make a choice here, that is, the two methods are not usually exclusive but complementary. It is indeed not at all possible to draw a sharp boundary between them.

G. the curve for dinosaurs below the Cretaceous-Tertiary boundary (cf. Russell, 1975,1977; Van Valen and Sloan, 1977). 12 shows a hypothetical relationship between relative abundance, observed highest occurrence and relative time for two taxa. Agterberg and Nel (1982b) introduced this example t o illustrate that the abundance of a taxon may have changed through time. The range of the frequency curve of its observed highest occurrence is narrower than the range of the abundance curve although these two curves end at the same value along the time axis.

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