PROVINCE Gulf Coastal Plains Coastal Prairies Interior Coastal Plains Blackland Prairies Grand Prairie Edwards Plateau Principal Pecos Canyons Stockton Plateau Central Texas Uplift North-Central Plains High Plains Central Southern Canadian Breaks Basin and Range MAX. ELEV. (ft) 300 800 1000 1250 3000 2000 4200 2000 3000 4750 3800 3800 8750 MIN. ELEV. (ft) 0 300 450 450 450 1200 1700 800 900 2900 2350 2200 1700 TOPOGRAPHY Nearly flat prairie, <1 ft/mi to Gulf Parallel ridges (questas) and valleys Low rolling terrain Low stairstep hills west; plains east Flat upper surface with box canyons Steep-walled canyons Mesa-formed terrain; highs to west Knobby plain; surrounded by questas Low north-south ridges (questas) Flat prairies slope east and south Highly dissected; local solution valleys Flat; many playas; local dune fields North-south mountains and basins GEOLOGIC STRUCTURE Nearly flat strata Beds tilted toward Gulf Beds tilted south and east Strata dip east Beds dip south; normal faulted Unfaulted, near-horizontal beds Centripetal dips, strongly faulted West dip; minor faults Slight dips east and south Some complex folding and faulting BEDROCK TYPES Deltaic sands and muds Unconsolidated sands and muds Chalks and marls Calcareous east; sandy west Limestones and dolomites Limestones and dolomites Carbonates and alluvial sediments Granites; metamorphics; sediments Eolian silts and fine sands Igneous; metamorphics; sediments QAd8544 Limestones; sandstones; shales Southern High Plains Central High Plains C o a s t a l P r a i r i e s CORPUS CHRISTI BROWNSVILLE B r e a k s Guadalupe Peak Stockton Plateau Pecos Canyons PHYSIOGRAPHIC MAP OF TEXAS 1996 BUREAU OF ECONOMIC GEOLOGY THE UNIVERSITY OF TEXAS AT AUSTIN University Station, Box X Austin, Texas 78713-8924 (512) 471-1534 0 0 100 50 100 200 300 kilometers 200 miles 150 HOUSTON AUSTIN DALLAS MIDLAND AMARILLO EL PASO SAN ANTONIO C a n a d i a n R I O G R A N D E B a l c o n e s E s c ar p m e n t B l a c k l a n d P r a i r i e s I n t e r i o r C o a s t a l P l a i n s W e s t e r n T i m b e r s

PHYSIOGRAPHIC MAP OF TEXAS · Coastal Prairies Interior Coastal Plains Blackland Prairies Grand Prairie Edwards Plateau Principal Pecos Canyons Stockton Plateau Central Texas Uplift

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PROVINCEGulf Coastal Plains

Coastal PrairiesInterior Coastal PlainsBlackland Prairies

Grand PrairieEdwards Plateau

PrincipalPecos CanyonsStockton Plateau

Central Texas UpliftNorth-Central PlainsHigh Plains

Central

SouthernCanadian Breaks

Basin and Range

MAX. ELEV. (ft)

300800

10001250

30002000420020003000

4750380038008750

MIN. ELEV. (ft)

0300450450

45012001700800900

2900235022001700

TOPOGRAPHY

Nearly flat prairie, <1 ft/mi to GulfParallel ridges (questas) and valleysLow rolling terrainLow stairstep hills west; plains east

Flat upper surface with box canyonsSteep-walled canyonsMesa-formed terrain; highs to westKnobby plain; surrounded by questasLow north-south ridges (questas)

Flat prairies slope east and southHighly dissected; local solution valleysFlat; many playas; local dune fieldsNorth-south mountains and basins

GEOLOGIC STRUCTURE

Nearly flat strataBeds tilted toward GulfBeds tilted south and eastStrata dip east

Beds dip south; normal faulted

Unfaulted, near-horizontal bedsCentripetal dips, strongly faultedWest dip; minor faults

Slight dips east and south

Some complex folding and faulting

BEDROCK TYPES

Deltaic sands and mudsUnconsolidated sands and mudsChalks and marlsCalcareous east; sandy west

Limestones and dolomitesLimestones and dolomitesCarbonates and alluvial sedimentsGranites; metamorphics; sediments

Eolian silts and fine sands

Igneous; metamorphics; sedimentsQAd8544