Browse Map

Explore away

Explore Map Collection

Check out our basemaps

Print a Map Plus

Generate a high-quality PDF

Field Guide

Discover local flora, fauna, geology, and more

Local Flora & Fauna

Learn the ecology of your area

Local Geology

Learn the geologic formation at your feet

Get Started or Sign In

Welcome

Continue with Apple

Already have an account? Sign In

MAP

Topo

Measure

Topo

Ecoregions

Public Lands

...

BASEMAPS

Default Weather

Temperature

Smoke

...

WEATHER

Tertiary Uplands

Ecoregion in TX, LA, AR

Print Map

Generate High-Quality PDF

The rolling Tertiary Uplands are dominated by commercial pine plantations that have replaced the native oak – hickory – pine forest. Ecoregion 35a is underlain by poorly-consolidated Tertiary sand, silt, and gravel; it lacks the Cretaceous, often calcareous rocks of Ecoregion 35d and the extensive Quaternary alluvium of Ecoregions 35b, 35g, and 73. Extensive forests dominated by loblolly and shortleaf pines grow on loamy, well-drained, thermic Ultisols; scattered, stunted, sandhill woodlands also occur. Waters tend to be stained by organics, thus lowering water clarity and increasing total organic carbon and biochemical oxygen demand levels. Most streams have a sandy substrate and a forest canopy. Many do not flow during the summer or early fall. However, in sandhills, spring-fed, perennial streams occur; here, total dissolved solids, total suspended solids, alkalinity, and hardness values are lower than elsewhere in Ecoregion 35. Water quality in forested basins is better than in pastureland. Oil production has lowered stream quality in the south.

— EPA

Taxonomy

Classified As

Ecoregion