Cretaceous-Tertiary Strata and Kaolin Deposits in the Inner Coastal Plain of Georgia
Published Online: 17 MAR 2013
Copyright 1989 by the American Geophysical Union.
Upper Cretaceous and Cenozoic Geology of the Southeastern Atlantic Coastal Plain: Atlanta, Georgia to Chesapeake, Virginia July 1-9, 1989
How to Cite
Harris, W. B., Hurst, V. J., Nystrom, P. G., Ward, L. W., Hoffman, C. W., Pickering, S. M., Price, L. K., Willoughby, R. H. and Zullo, V. A. (1989) Cretaceous-Tertiary Strata and Kaolin Deposits in the Inner Coastal Plain of Georgia, in Upper Cretaceous and Cenozoic Geology of the Southeastern Atlantic Coastal Plain: Atlanta, Georgia to Chesapeake, Virginia July 1-9, 1989, American Geophysical Union, Washington, D. C.. doi: 10.1029/FT172p0002
- Published Online: 17 MAR 2013
- Published Print: 1 JAN 1989
Print ISBN: 9780875906171
Online ISBN: 9781118666906
- Cretaceous sediments;
- Field trip itinerary;
- Huber Formation;
- Inner Coastal Plain;
- Kaolin deposits;
- Metamorphic rocks;
- Sedimentary structures
Upper Cretaceous to mid-Tertiary sediments of the inner Coastal Plain sketchily record a long interval of intense weathering, erosion, and deposition in a passive area that was inundated and reexposed, repeatedly, by major fluctuations of sea level. Low to moderate relief was maintained for more than 90 my while the area alternated between inner coastal plain and inner continental shelf. Regressions are marked by fluvial kaolinitic sands and clays and well zoned weathering profiles. Transgressions are marked by littoral sands and by neritic clays and carbonates .
Kaolinite-rich detritus transported to the inner Coastal Plain originated through weathering of metamorphic and igneous rocks of the Piedmont Upland. Most of the sediments underwent more than one stage of sorting and weathering. Some were significantly modified by post-depositional leaching, oxidation, and diagenesis. Commercial kaolins are found where successive stages favored both beneficiation and final preservation. Three types of kaolin can be distinguished: soft, hard, and flint. The first two types are commercial. Superb exposures of the sediments and associated kaolins are provided by large opencut kaolin mines in this area, which is one of the world's larger producers of industrial clay.