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88°28'30"W

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34°37'30"N 34°37'30"N

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34°34'30"N 34°34'30"N

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Structural Cross-Section of the Marietta 7.5-Minute Geologic Quadrangle

Feet500

400

300

200

100

Sea Level

Feet500

400

300

200

100

Sea Level

¶GEOLOGIC MAPMARIETTA QUADRANGLEPrentiss County, Mississippi

T. 5 S.

T. 6 S. T. 5 S.

T. 6 S.

2009-2018 Mississippi Statewide LIDAR-Generated DEM and Hill Shade

A

A'

Geology field checked in 1992, 2014, 2015, and 2017 using the 1971, U.S. Geological Survey 7.5-minute topographic quadrangle, Universal Transverse Mercatorprojection, 1927 North American datum, contour interval 20 feet. Universal Transverse Mercator projection, 1983 North American datum. GRS80 spheroid. 1000-meterUniversal Transverse Mercator 1983 datum grid ticks, zone 16, shown in red. September 2019 magnetic declination 2.48° W ± 0.34° changing by 0.07° W per year.Sources: Contours obtained from Mississippi Automated Resource Information System (MARIS). Public Land Survey System, 1:24,000 scale, railroad features,highway features, and hydrologic information from MARIS. We thank the National Park Service and Mississippi State University for their cooperation and for facilitatingthe data collection and fieldwork necessary for this mapping project. Public Land Survey System from MARIS, 1:24,000 scale. Lidar from Brad Segrest & BarbaraYassin of The Mississippi Department of Environmental Quality (MDEQ), Natural Resources Conservation Service, National Oceanic and Atmospheric Administration,United States Army Corps of Engineers, and MARIS. Building Footprint data is licensed by Microsoft under the Open Data Commons Open Database License (ODbL).Geographic Information System by Kate Grala, and Darrel W. Schmitz, Mississippi State University, and Jonathan R. Leard, GIT, MDEQ Office of Geology-SurfaceMapping Division. MDEQ does not warrant the accuracy or completeness of the source data. Geologic maps are only a guide to current understanding and do noteliminate the need for detailed investigations of specific sites for specific purposes.Publishing Organization: This map was produced by the Mississippi Office of Geology in cooperation with Mississippi State University. This map was funded through agrant from the National Park Service.

1 0 10.5Miles

1 0 10.5Miles

L-0001Mississippi Geological Survey

A.J. SampleSec.30 - T.6S - R.8E

Elev.460ft. T.D.451Ft.

L-0003Mississippi Bureau of Geology

New Site Water AssociationSec.13 - T.6S R- 8E.

Elev.370ft. T.D. 272ft.

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Big BrownCreek

SaplingCreek Alluvium

COFFEE SAND

MCSHAN FORMATION

EUTAW FORMATION

TUSCALOOSA FORMATION

Alluvium

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DESCRIPTION OF MAP UNITS

M I S S I S S I P P I D E P A R T M E N T O FE N V I R O N M E N T A L Q U A L I T Y

O F F I C E O F G E O L O G Y

O P E N - F I L E R E P O R T 3 0 8

G E O L O G I C M A Pof the

MARIETTA QUADRANGLEP r e n t i s s C o u n t y, M i s s i s s i p p i

2019

Geology by Ernest E. Russell, PhD and Darrel Schmitz, RPG

Cross-Section by Darrel Schmitz, RPGand Jonathan R. Leard, GIT

20x Vertical Exaggeration

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Sand, buff, yellow, red-brown, light to dark gray, fine to meduim-grained, glauconitic, with zones of silty sandand clay and occasional thin beds of concretionary sandtone layers. Fossiliferous in certain parts. The base of the Coffee Formationis questionably disconformable, almost impossible to differenitiateon the basis of lithology from the underlying Tombigbee Member sands. The only evidence are phosphatic molds and general fossilsin the basal Coffee not common to the Tombigbee. Thicknessranges up to about 140 feet.

EUTAW FORMATIONKet Tombigbee Member, Sand, Olive drab to light- to reddish-brown,light to dark gray, greenish-gray, fine-grained, massive, glauconitic, in part argillaceous, micaceous, somewhat calcareous, and fossiliferous.The base is conformable with the underlying portion of the EutawFormation. Thickness ranges up to 55 feet.

Sand, tan, yellow, brown, reddish-brown light to dark gray, greenish gray, glauconitic, fine to course grained, cross-bedded, with laminae of dark gray flaky clay, and stringers of small chert gravel, locallycarbonaceous and locally fossiliferous. The Eutaw Formationdisconformably ovelays the McShan Formation. Thickness ranges up toabout 200 feet.

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TERRACE ALLUVIUMAbandoned floodplain deposits of clay, silt, and sand generallyyellowsih-orange, orange, and tan. Approximately 25 feet thick adjacent to larger stream Alluvium or younger terrace deposits, thinning or non-existent up tributiaries. Qt1 - youngest and lowestin elevation of Terrace alluvium deposits. Qt2 - second youngest in age and elevation of Terrace alluvium deposits. Qt3 - third youngestin age and elevation of Terrace alluvium deposits. Qt4 -fourthyoungest in age and elevation of Terrace alluvium deposits that is more eroded and discontinuous. PL

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ALLUVIUMFloodplain deposits of clay, silt, and sand. Generally gray, yellowish-orange, orange, and tan. Approximately 25 feet thick along larger streams, thinning up tributaries.

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MOOREVILLE CHALKMassive-bedded marly chalk and calcareous clay. Medium to light gray, and blueish-gray, weathers to tan. Locally sandy and containssubordinate amounts of glauconite. Fossiliferous in many locations.Conformable contact with overlying Coffee Sand.Thickness rangesfrom approximately 115 to 160 feet.

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1,000 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000Feet

SCALE 1:24,000

1 0 10.5Miles

1 0 10.5Kilometers

Contour Interval : 20 Feet2019 Mississippi Department of Environmental Quality, Office of Geology·Copyright

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