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MAP9 (printed) - Central High Plains s eak Br C dia ana n...

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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 Southern High Plains Central High Plains Ba l c one s Es ca r p m e n t Bl a c k l a n d P r a i r i e s In te ri or C oas t al Pla i n s C o a st a l P r a ir i e s CORPUS CHRISTI C a n a d i a n B r e a k s W e s te r n T imbe r s Guadalupe Peak Stockton Plateau Pecos Canyons 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
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Physiography of Texas eastern rocks and soils weather tan to buff. Live oak–ashe juniper parks grade westward into mesquite–lotebush brush. High Plains. The High Plains of Texas form a nearly flat plateau with an average elevation approximating 3,000 feet. Extensive stream-laid sand and gravel deposits, which contain the Ogallala aquifer, underlie the plains. Windblown sands and silts form thick, rich soils and caliche locally. Havard shin oak–mesquite brush dominates the silty soils, whereas sandsage–Havard shin oak brush occupies the sand sheets. Numerous playa lakes scatter ran- domly over the treeless plains. The eastern boundary is a westward-retreating escarpment capped by a hard caliche. Headwaters of major rivers deeply notch the caprock, as exemplified by Palo Duro Canyon and Caprock Canyons State Parks.
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  • Spring '07
  • Parzen
  • High Plains, Gulf Coastal Plains, Gulf Coastal Plains Coastal Prairies Interior Coastal Plains Blackland Prairies Grand Prairie Edwards Plateau Principal Pecos Canyons Stockton Plateau

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