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Quantitative biostratigraphy (view source)
Revision as of 16:41, 18 January 2014
, 16:41, 18 January 2014→Graphic correlation: typos
==Graphic correlation==
==Graphic correlation==
Graphic correlation.<ref name=ch17r79>Shaw, A., B., 1964, Time in Stratigraphy: New York, McGraw-Hill, 365 p.</ref> is a widely accepted deterministic technique for ranking fossil occurrences according to the geological time represented in a set of reference sections. This approach has broad applications to solving biostratigraphic and sedimentologic problems (see <ref name=ch17r61>Mann, K., O., Lane, H., R., eds., 1995, Graphic Correlation: SEPM (Society for Sedimentary Geology) Special Publication 53, 263 p.</ref>
Graphic correlation<ref name=ch17r79>Shaw, A., B., 1964, Time in Stratigraphy: New York, McGraw-Hill, 365 p.</ref> is a widely accepted deterministic technique for ranking fossil occurrences according to the geological time represented in a set of reference sections. This approach has broad applications to solving biostratigraphic and sedimentologic problems (see Mann & Lane<ref name=ch17r61>Mann, K., O., Lane, H., R., eds., 1995, Graphic Correlation: SEPM (Society for Sedimentary Geology) Special Publication 53, 263 p.</ref>).
The format for a graphic correlation is an x–y crosspiot on which biostratigraphic data (tops, bases, abundance/diversity events) recorded by measured stratigraphic position in one section (y-axis) may be matched to like occurrences in another section or a composite standard (x-axis; see Figure 17-27). Based on the array of data points, a preferred overall correlation can be defined by one or more line segments. Points falling on the line(s) of correlation are interpreted to be synchronous markers; those off the line(s), diachronous.
The format for a graphic correlation is an x–y crossplot on which biostratigraphic data (tops, bases, abundance/diversity events) recorded by measured stratigraphic position in one section (y-axis) may be matched to like occurrences in another section or a composite standard (x-axis; see Figure 17-27). Based on the array of data points, a preferred overall correlation can be defined by one or more line segments. Points falling on the line(s) of correlation are interpreted to be synchronous markers; those off the line(s), diachronous.
The illustration below shows a graphic correlation of two sections.
The illustration below shows a graphic correlation of two sections.