thumbnail

Use of time-trend curves to interpret depositional environments in portions of the Chickamauga Group carbonates (Middle Ordovician, northeastern Alabama)

Journal of the International Association for Mathematical Geology

By:
DOI: 10.1007/BF02083192

Links

Abstract

Data from point counts of 376 thin sections from six stratigraphic sections in the Chickamauga Group carbonates (Middle Ordovician of northeastern Alabama) were smoothed by time-trend methods. The resulting curves were plotted against the stratigraphic sections to show depositional trends and to facilitate interpretation of depositional environments. The depositional environments in the lower third of the sequence studied were dominantly subtidal; in the middle portions they were interbedded subtidal, intertidal, and supratidal; in the lower upper third they were supratidal; and in the uppermost portions they were interbedded subtidal, intertidal, and supratidal. Time-trend methods proved to be useful in this study, for they are easy to use and eliminate much noise observed in the data, whereas preserving major trends. Correlation between outcrops was by means of two continuous bentonites; comparison of the time-trend curves show that they would have been useful for correlation if the bentonites had been absent, although small differences in the vertical positions of beds between localities (indicating lateral migration of environments) would not have been detected by time-trend methods. ?? 1972 Plenum Publishing Corporation.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Use of time-trend curves to interpret depositional environments in portions of the Chickamauga Group carbonates (Middle Ordovician, northeastern Alabama)
Series title:
Journal of the International Association for Mathematical Geology
DOI:
10.1007/BF02083192
Volume
4
Issue:
1
Year Published:
1972
Language:
English
Publisher:
Kluwer Academic Publishers-Plenum Publishers
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of the International Association for Mathematical Geology
First page:
45
Last page:
54