physiographic map of texas · coastal prairies interior coastal plains blackland prairies grand...
TRANSCRIPT
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
Limestones; sandstones; shales
SouthernHigh
Plains
Central High Plains
Coastal Prairie
s
CORPUSCHRISTI
BROWNSVILLE
Breaks
GuadalupePeak
StocktonPlateau
PecosCanyons
PHYSIOGRAPHIC MAP OF TEXAS1996
BUREAU OF ECONOMIC GEOLOGYTHE UNIVERSITY OF TEXAS AT AUSTIN
University Station, Box XAustin, Texas 78713-8924
(512) 471-1534
0
0 100
50 100
200 300 kilometers
200 miles150
HOUSTON
AUSTIN
DALLAS
MIDLAND
AMARILLO
EL PASO
SAN ANTONIO
Canadian
RIO GRANDE
Balcones EscarpmentBla
ckla
nd P
rair
ies
Inte
rior C
oast
al P
lain
s
Wes
tern
Tim
bers