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Eastern Cross Timbers

Ecoregion on Great Plains in TX, OK

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The rolling hills, cuestas, and ridges of the Eastern Cross Timbers are naturally covered by oak savanna, scrubby oak forest, eastern redcedar, and tall grass prairie and are underlain by sand, shale, clay, sandstone, calcareous shale, and limestone. Ecoregion 29b is lithologically and physiographically distinct from the Grand Prairie (29d) and Arbuckle Mountains (29i). It is both floristically and lithologically unlike the Cretaceous Dissected Uplands (35d) to the east. Post oak and blackjack oak are dominant on sandy soils; finer soils support grasses. Tree height and density are typically greater than in the drier Western Cross Timbers (29c) and Northwestern Cross Timbers (29h). Floristic variety, vegetation density, and growing season is greater than in the Northern Cross Timbers (29a). Today, livestock farming is the main land use, but some cropland also occurs. Abandoned farmland is common.

— EPA

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