Read e-book online Automated Stratigraphic Correlation PDF

By F. P. Agterberg

ISBN-10: 0080868541

ISBN-13: 9780080868547

ISBN-10: 0444882537

ISBN-13: 9780444882530

This ebook presents an advent to contemporary advancements in automatic stratigraphic correlation of fossil info, utilizing laptop courses for rating and scaling of stratigraphic occasions. Mainframes or microcomputers can be utilized to help 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 automatic correlation. The e-book is meant for complicated geology scholars, study employees and lecturers with a heritage in stratigraphy and an curiosity in utilizing computer-based thoughts for problem-solving.

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Sample text

It is noted however, that Edwards’ assumption on the nature of the skewness differs from t h a t implied by Jasko’s model, in which the tail of observed lowest occurrences extends i n the stratigraphically downward direction ( I n Edwards’ model it extends upward). In the model of Strauss and Sadler, the tail for highest occurrences points downward which is i n agreement 39 with Edwards’ assumption. Likewise, the model of Signor and Lipps (Fig. 11B) is i n agreement with t h a t of Edwards because the slope of their curve continues to increase in the stratigraphically upward direction.

Unfortunately, it turns out that large samples would be needed to estimate, with precision, the relative abundances of many different species.

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. g. 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.

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Automated Stratigraphic Correlation by F. P. Agterberg

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