Geology Web Map

The geology of the map below represents geological mapping projects in the Ouachitas and Arkansas River Valley under the COGEO mapping program and in the West Gulf Coastal Plain under the STATEMAP program. You can zoom to a chosen county or quadrangle using the drop-down menus located above the map, and you can adjust the opacity of the surface geology layer using the opacity slider opacity slider icon located at the top left corner of the map. For best printing results use either the Mozilla Firefox or Google Chrome web browsers.


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ZOOM TO:   7.5' Quadrangle

Coordinates format:

Geology Web Map Legend

strike symbol - Geology Map Legend Inclined bedding - Showing approximate strike and dip
overturned strike symbol - Geology Map Legend Overturned bedding - Showing approximate strike and dip
contact symbol - Geology Map LegendContact - Existence certain, location approximate
igneous dike symbol - Geology Map LegendIgneous Dike - Existence certain, location approximate
normal fault symbol - Geology Map LegendNormal Fault - Existence certain, location approximate
normal fault inferred symbol - Geology Map LegendNormal Fault - Inferred or concealed
tear fault symbol - Geology Map LegendTear Fault - Existence certain, location approximate
tear fault inferred symbol - Geology Map LegendTear Fault - Inferred or concealed
thrust fault symbol - Geology Map LegendThrust Fault - Existence certain, location approximate
thrust fault inferred symbol - Geology Map LegendThrust Fault - Inferred or concealed
overturned thrust fault symbol - Geology Map LegendOverturned Thrust Fault - Existence certain, location approximate

Alluvium - Quaternary symbolAlluvium - Quaternary
Sand & Gravel - Quaternary symbolSand & Gravel - Quaternary
Stream Overbank - Quaternary symbolStream Overbank - Quaternary
Terrace - Quaternary symbolTerrace - Quaternary
River Terrace - Quaternary symbolRiver Terrace - Quaternary

Sand & Gravel - Tertiary symbolSand & Gravel - Tertiary
Gravel - Tertiary symbolGravel - Tertiary
Claiborne Group - Tertiary symbolClaiborne Group - Tertiary
Wilcox Group - Tertiary symbolWilcox Group - Tertiary
Midway Group - Tertiary symbolMidway Group - Tertiary

Arkadelphia Marl - Cretaceous symbolArkadelphia Marl - Cretaceous
Nacatoch Sand - Cretaceous symbolNacatoch Sand - Cretaceous
Saratoga Chalk - Cretaceous symbolSaratoga Chalk - Cretaceous
Marlbrook Marl - Cretaceous symbolMarlbrook Marl - Cretaceous
Annona Chalk - Cretaceous symbolAnnona Chalk - Cretaceous
Ozan Formation - Cretaceous symbolOzan Formation - Cretaceous
Brownstone Marl - Cretaceous symbolBrownstone Marl - Cretaceous
Tokio Formation - Cretaceous symbolTokio Formation - Cretaceous
Woodbine Formation - Cretaceous symbolWoodbine Formation - Cretaceous
Kiamichi/Goodland Formation - Cretaceous symbolKiamichi/Goodland Formation - Cretaceous
Trinity Group - Cretaceous symbolTrinity Group - Cretaceous
De Queen Limestone - Cretaceous symbolDe Queen Limestone - Cretaceous
Dierks Limestone - Cretaceous symbolDierks Limestone - Cretaceous
Igneous Rocks - Cretaceous symbolIgneous Rocks - Cretaceous

Boggy - Pennsylvanian, Desmoinesian Series symbolBoggy - Pennsylvanian, Desmoinesian Series
Savanna - Pennsylvanian, Desmoinesian Series symbolSavanna - Pennsylvanian, Desmoinesian Series
McAlester - Pennsylvanian, Desmoinesian Series symbolMcAlester - Pennsylvanian, Desmoinesian Series
Hartshorne Sandstone - Pennsylvanian, Desmoinesian Series symbolHartshorne Sandstone - Pennsylvanian, Desmoinesian Series
Upper Atoka - Pennsylvanian, Atokan Series symbolUpper Atoka - Pennsylvanian, Atokan Series
Middle Atoka - Pennsylvanian, Atokan Series symbolMiddle Atoka - Pennsylvanian, Atokan Series
Lower Atoka - Pennsylvanian, Atokan Series symbolLower Atoka - Pennsylvanian, Atokan Series
Johns Valley Shale - Pennsylvanian, Morrowan Series symbolJohns Valley Shale - Pennsylvanian, Morrowan Series
Jackfork Sandstone - Pennsylvanian, Morrowan Series symbolJackfork Sandstone - Pennsylvanian, Morrowan Series

Stanley Shale - Mississippian symbolStanley Shale - Mississippian
Arkansas Novaculite - Devonian and Early Mississippian symbolArkansas Novaculite - Devonian and Early Mississippian

Missouri Mountain Shale - Silurian symbolMissouri Mountain Shale - Silurian
Blaylock Sandstone - Silurian symbolBlaylock Sandstone - Silurian
Missouri Mountain Shale /  Polk Creek Shale - Silurian and Late Ordovician symbolMissouri Mountain Shale / Polk Creek Shale - Silurian and Late Ordovician

Polk Creek Shale - Late Ordovician symbolPolk Creek Shale - Late Ordovician
Bigfork Chert - Middle and Late Ordovician symbolBigfork Chert - Middle and Late Ordovician
Womble Shale - Middle Ordovician symbolWomble Shale - Middle Ordovician
Blakely Sandstone - Middle Ordovician symbolBlakely Sandstone - Middle Ordovician
Mazarn Shale - Early Ordovician symbolMazarn Shale - Early Ordovician
Crystal Mountain Sandstone - Early Ordovician symbolCrystal Mountain Sandstone - Early Ordovician
Collier Shale - Late Cambrian and Early Ordovician symbolCollier Shale - Late Cambrian and Early Ordovician
Strip Mine symbolStrip Mine

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