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SCALE 1:100,000Base map from U.S. Geological Survey 1:100,000 Digital Line Graphs (100K DLG)

Universal Transverse Mercator Projection, Zone 15North American Datum 1927 (NAD 27)

Contour Interval 2 metersNational Geodetic Vertical Datum 1929

Miles 1311 129 107 85 63 41 21

Kilometers 2019181716151413121110987654321

0

01

WHITE LAKE, LOUISIANA29092-E1-TM – 100K

30 x 60 MINUTE GEOLOGIC QUADRANGLE SERIES

15'30'45'

45'

45' 30' 15' 92°30'

29°30'

45'

30°00'92°30'

.

WHITE LAKE, LOUISIANA

30°00'93°00'

93°00'29°30'

White Lake 30 x 60 Minute Geologic Quadrangle2006

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

Copyright ©2006 by the Louisiana Geological Survey

Geology by: Paul V. Heinrich

GIS compilation by: R. Hampton Peele, Jomish George, Arvind Parthasarathy and Arti Singh

Cartography by: John Snead and Lisa Pond

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Description of Map Units

HOLOCENE

Holocene undifferentiated alluvium—undifferentiated deposits of small upland streams: alluvial deposits of minor streams and creeks, of varying textures, filling valleys incised into older deposits.

Holocene coastal swamp and marsh—gray-to-black clays of high organic content and thick peat beds underlying freshwater marsh and swamp.

Mermentau Alloformation—Complexly interfingering and interbedded, dark-colored marine muds, sandy and shelly beach deposits, organic marsh clays, and lacustrine and bay muds. These deposits bury the surfaces of the Prairie and Deweyville Allogroups. The Louisiana chenier plain forms the surface of the Mermentau Alloformation. The Alloformation extends westward along the coast into Texas as far west as Galveston Bay. Eastward, it extends almost to the west shore of Vermilion Bay, where it interfingers with deltaic sediments of the Teche delta lobe. Seaward of the shoreline, the Mermentau Alloformation grades laterally into unnamed marine sediments.

Holocene coastal ridges (cheniers)—Sandy and/or shelly ridges, of predominantly coast-parallel orientation, delineated on portions of the surface of the Holocene Mermentau Alloformation. They comprise beach ridges separated from each other by extensive tracts of coastal marsh. The areas mapped may include some ridges of other origin in places.

Deltaic plain of the Teche delta lobe, Mississippi River—Deltaic deposits predominantly composed of cyclically interbedded interdistributary peat and clay; natural levee silt and clay; distributary sand; and delta-front and prodelta mud and clay. These sediments lie upon the surfaces of the Maringouin and other older delta lobes, which are either buried beneath younger delta lobes, submerged beneath the Gulf of Mexico, or a combination of both, and upon the surface of the underlying Prairie Allogroup.

PLEISTOCENE

LOESS

Peoria Loess—Eolian silt veneer of late Wisconsin age mantling Pleistocene and older strata. Loess is shown where the total thickness is 1 meter or greater.

PRAIRIE ALLOGROUP

A diverse depositional sequence of late to middle Pleistocene deposits of the Mississippi River, its tributaries, and coastal plain streams; includes terraced, fluvial (meander-belt, backswamp, and braided-stream), colluvial, estuarine, deltaic, and marine units deposited over a considerable part of the late Pleistocene (Wisconsin to Sangamon). Surfaces generally show little dissection and are topographically higher than the Holocene units. Multiple levels are recognized along alluvial valleys and coast-parallel trends. The Prairie is divided into two temporal phases of deposition.

PRAIRIE ALLOGROUP, LATE SANGAMON—younger of the Prairie Allogroup temporal phases. Alluvial deposits of ancestral late Pleistocene streams. In the coast-parallel Prairie the unit consists of meander-belt deposits of the late Pleistocene Mississippi River, and deposits of the late Pleistocene coastal plain streams. Deposits associated with these valleys are commonly found within the upper portions of the drainage basins. Sediments at the top of the unit range from sand to clay.

Avoyelles alloformation—meander-belt deposits of the late Pleistocene Mississippi River terraced above and parallel to its alluvial valley in central Louisiana, blanketed by Peoria Loess. Includes the Lafayette meander belt, meander-belt deposits of the late Pleistocene Mississippi River terraced above and parallel to its western valley wall and incised into the Prairie Allogroup, Early Sangamon, Beaumont Alloformation in southwestern Louisiana. Two flood-plain levels are locally recognized.

PRAIRIE ALLOGROUP, EARLY SANGAMON— older of the Prairie Allogroup temporal phases. A diverse depositional sequence of flood plain, meander-belt, and backswamp deposits of the middle Pleistocene ancestral Mississippi River, Red River, local fluvial equivalents of tributary streams, and coastal plain streams. The sediments are generally clay, silty clay loam, or sandy clay loam, but may include some sand and gravel in deposits of relict channels.

Beaumont Alloformation—coastal plain deposits of late to middle Pleistocene streams; the oldest alloformation and topographically highest surface of the Prairie Allogroup units of southwestern Louisiana.

relict Pleistocene coastal ridges—low-lying ridges delineated on the surface of the Beaumont Alloformation. Some of these ridges are coast-parallel and others trend obliquely to the coast and radiate from the end of known meander belts.

Open Water

Contact—includes inferred contacts.

Fault

Streams

Roads

Topographic contours

1934

Ple

isto

cen

e

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loce

ne

Published (2006)

White LakePort Arthur

Lake Charles

De Ridder

Gulfport

30 x 60 Minute Geologic Quadrangles

in production

L O U I S I A N A

Ponchatoula

Ville Platte BogalusaAmite

50 miles0

909294

32

30

Crowley Baton Rouge

New Roads

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coastal plain

Chacko J. John

Director & State Geologist

Correlation of Map Units

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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 1:100,000. A detailed on-the-ground survey and analysis of a specific site may differ from these maps.

Cheniers represent new mapping by the compiler based on LIDAR quarter-quadrangle images (source: Louisiana Federal Emergency Management Agency, and U.S. Army Corps of Engineers, St. Louis District), and digital orthophoto quarter quadrangle images (originator: Louisiana Oil Spill Coordinator's Office)

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Mississippi River valley