Presentation is loading. Please wait.

Presentation is loading. Please wait.

1 Upper Eocene John Ariail. 2 Introduction Roughly 55.8 million year ago Jacksonian Provenance  Upper and lower components separated by discontinuity.

Similar presentations


Presentation on theme: "1 Upper Eocene John Ariail. 2 Introduction Roughly 55.8 million year ago Jacksonian Provenance  Upper and lower components separated by discontinuity."— Presentation transcript:

1 1 Upper Eocene John Ariail

2 2 Introduction Roughly 55.8 million year ago Jacksonian Provenance  Upper and lower components separated by discontinuity that can be trace from eastern Miss. To central S.C.  Discontinuity from uplift of Piedmont and mild regression at lower Jacksonian boundary.  Divided into Ocala and Barnwell groups

3 3

4 4

5 5

6 6 Barnwell Group Clinchfield, Dry Branch, & Tobacco Road Sandstone Formations Series of Upper Eocene near shore to coastal marine, sandy deposits in the Fall Line Hills area of central to eastern GA and western SC Grades downdip into Ocala Group Mainly quartz sand, smaller amounts of clay, limestone, chert, siliceous fossils, and small bone fossils such as fish teeth Highly permeable sands make up the Upper Three Runs Aquifer

7 7 Barnwell Group Overlies Huber formation Has smectite clays versus kalonitic of Huber Formation Altamaha Formation (marginal marine) overlies Barnwell Group

8 8 Clinchfield Formation Riggins Mill, Treadwell, Albion, & Utley Limestone Members east of Ogechee River Basal sand deposit of Barnwell group Mainly medium-grained well-sorted unconsolidated calcareous & fossiliferous sand. Overlies the Oconee Group

9 9 Dry Branch Formation Twiggs Clay, Irwington Sand, & Griffins Landing Member Overlies the Utely Limestone of Clinchfield Sand Formation Shallow water, marine depositional environment with giant oyster fossils present suggesting presence of near shore environment with fresh water input Three members interfinger suggesting near shore environment including bays, lagoons, beaches, tidal inlets, and oyster beds

10 10 Tobacco Road Sandstone Formation Burrowed & bioturbated, massive, poorly sorted, medium to coarse, pebbly, weathered sand Extends from Houston County to SC with a northern limit of the Fall Line Discontinuous bed of flat pebbles serve as marker for the basal contact with the Dry Branch Formation beneath it. Coastal marine, beach, to back barrier depositional environment Cross-bedded with presence of silicified sand dollars

11 11 Ocala Group Ocmulgee, Tivola Limestone, Williston, & Crystal River Formation In the subsurface underlies more than 4/5’s of Georgia coastal plain

12 12 Williston & Crystal River Formations Recognized in Southwestern GA, Wayne County in Eastern GA Extends into Alabama Williston Formation correlated with Moodys Branch Formation in Alabama Williston - indurated, recrystalized limestone, less fossiliferous than lateral equivalent Tivola Limestone

13 13 Williston & Crystal River Formations Crystal River – softer, less consolidated coarse fossiliferous limestone, foramifera rich Lateral equivalents of Tivola & Ocmulgee Coincide with lower / upper Jacksonian boundary Limestone lithology indicates minor sea regression and restricted marine conditions on continental shelf

14 14 Tivola Limestone Byrozoan-rich, coarse, bioclastic limestone Poor sorting of bioclastic debris Large fossils such as oysters & byrozoans Areas have been removed by solution, leaving a brown clayey, cherty residium between Dry Branch & Clinchfield Formations Grades laterally to the east & north into the Twiggs member of Dry Branch Formation

15 15 Ocmulgee Formation Extends from Houston & Pulaski Counties east as far as Savannah River Slightly indurated, fossiliferous, very calcareous, granular limestone Facies change laterally into the Tobacco Road Sandstone Nearshore facies or subdivision of offshore Ocala Group Used to be referred to as Cooper Marl, but is not the lateral equivalent of Cooper Marl in South Carolina

16 16 Conclusion Upper Eocene deposits extend south of the Fall Line Can be correlated from Mississippi to South Carolina Largely shallow marine depositional environment Dominated by a period of major transgression of the Jackson Sea with minor periods of regression Major deposits are limestone, sandstone, & calcareous sandstone

17 17 References Herrick, S.M., & Counts, H.H., (1968). Late Tertiary Stratigraphy of Eastern Georgia. U.S. Geological Survey, Water Resources Division, Atlanta, Georgia. Herrick, S.M., (1971). Age and Correlation of the Clinchfield Sand in Georgia, Contributions To Stratigraphy. Geological Survey Bulletin 1354-E. Huddlestun, Paul F., & Hetrick, John H., (1979). The Stratigraphy of the Barnwell Group of Georgia. Reprinted 1988 by the Georgia Geological Society. Huddlestun, Paul F., & Hetrick, John H., (1986). Upper Eocene Stratigraphy of Central and Eastern Georgia. Department of Natural Resources Environmental Protection Division Georgia Geologic Survey, Bulletin 95. Huddlestun, Paul F., & Summerour, Joseph H., (1996). The Lithostratigraphic Framework of The Uppermost Cretaceous And Lower Tertiary of Eastern Burke County, Georgia. Department of Natural Resources Environmental Protection Division Georgia Geologic Survey, Bulletin 127. Richards, Horace G., (1955). The Paleocene and Eocene of Geogia (Part 2: Upper Eocene). Georgia Geological Survey, Atlanta, Georgia.


Download ppt "1 Upper Eocene John Ariail. 2 Introduction Roughly 55.8 million year ago Jacksonian Provenance  Upper and lower components separated by discontinuity."

Similar presentations


Ads by Google