EA

STB

ATO

NROUGE

PARISH

LIVING STO N PARI SH

EAST BATON ROUGE PARISH

LIVINGSTONPARISH

CENTRAL

ADE H MSPRINGS

N

GreenwellSprings

PlainviewMagnolia

Watson

The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government or the state of Louisiana.

This map has been carefully prepared from the best existing sources available at the time of preparation. However, the Louisiana Geological Survey and Louisiana State University do not assume responsibility or liability for any reliance thereon. This information is provided with the understanding that it is not guaranteed to be correct or complete, and conclusions drawn from such data are the sole responsibility of the user. These regional geologic quadrangles are intended for use at the scale of 1:24,000. A detailed on-the-ground survey and analysis of a specific site may differ from these maps.

SCALE 1:24,000

Base map from U.S. Geological Survey 1:24,000 GeoPDFUniversal Transverse Mercator Projection, Zone 15

North American Datum 1983 (NAD 83)Contour Interval 5 Feet

National Geodetic Vertical Datum 1988

Watson 7.5 Minute Geologic QuadrangleOpen File Series 2016-04

Chacko J. John

Director & State Geologist

APPROXIMATE MEANDECLINATION, 2016

0o 06’ E

1000 500 0 METERS 1000 2000

21KILOMETERS00.51

1 0.5 0

MILES

1

QUADRANGLE LOCATION

LOUISIANA

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SCALE 1:24 000

7.5 MINUTE GEOLOGIC QUADRANGLE SERIESWATSON, LOUISIANA

Produced and published by the Louisiana Geological Survey3079 Energy, Coast & Environment Building, Louisiana State UniversityBaton Rouge, LA 70803 • 225/578-5320 • www.lgs.lsu.edu

This geologic map was funded in part by the USGS National CooperativeGeologic Mapping Program under StateMap award number G15AC00247, 2015.

Copyright ©2016 by the Louisiana Geological Survey

Geology by: Richard P. McCulloh and Paul V. Heinrich

GIS Compilers: R. Hampton Peele, Richard P. McCulloh, and Paul V. Heinrich

Cartography by: Robert L. Paulsell

Beav

erCr

Moler

Bayou

Spillers Cr

San d y Cr

Colton Cr

Beav

erBr

W Colyell Cr

WCo

lyel

l Cr

Amit

eR

iver

Amite River

Amite River

Sandy Creek

Amite

R

iver

W Colyell Creek

Amite River

QUATERNARY SYSTEM

HOLOCENE

Holocene undifferentiated alluvium—Undifferentiated deposits of small upland streams: unconsolidated alluvial deposits of minor streams and creeks filling valleys incised into older deposits, with textures varying from gravelly sand to sandy mud.

PLEISTOCENE

LOESS—Eolian silt veneer of late Wisconsin age (Peoria Loess) mantling Pleistocene and older strata. Underlain in places by older loess of possible late Sangamon to early Wisconsin age (Sicily Island Loess). Loess is shown where the total thickness of either or both loess units is 1 meter or greater.

PRAIRIE ALLOGROUP

Hammond alloformation—Deposits of middle to late Wisconsin coastal-plain streams in the Florida Parishes of southeastern Louisiana. It consists of grayish silty clay to very fine to medium sand, with abundant ferromagnesian nodules (≤ 2 cm) in places, and in the northern Pride to western Watson 7.5-minute quadrangles is covered by 1 m or more of Peoria Loess.

Open Water

Contact—Includes inferred contacts.

Approximately located fault—Identity and existence certain, location approximate. Ball and bar on downthrown block.

Concealed fault—Identity and existence certain, location concealed. Ball and bar on downthrown block.

Roads and Railroads

Streams

Topographic Contours

References:

Loess distribution based on:

Miller, B. J. (compiler), [1983], [Distribution and thickness of loess in Baton Rouge, Louisiana 1 × 2 degree quadrangle]: Louisiana State University Department of Agronomy, Louisiana Agricultural Center, Louisiana Agricultural Experiment Station, Baton Rouge, unpublished map, Louisiana Geological Survey, scale 1:250,000.

Description of Map Units

Hua

Pph

Hol

ocen

eP

leis

toce

ne

Southeast Louisiana Coastal Plain

Hua

Pph

Peoria Loess

Correlation of Map Units

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