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Carbonate Cross Timbers

Ecoregion on Great Plains, TX

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The Carbonate Cross Timbers ecoregion is that portion of the Western Cross Timbers (29c) that has Pennsylvanian or Cretaceous limestone substrate. This area is not included on some maps of the Cross Timbers, because it does not support the typical oak woodland of the sandstone-based territory surrounding it. The topography of Ecoregion 29f is also somewhat different from that of the Western Cross Timbers (29c) as it contains low mountains rather than alternating ridges and shallow basins. The limestone substrate is apparent in the vegetation cover, which has more plateau live oak, honey mesquite, and pure Ashe juniper woodland than in other surrounding Cross Timbers areas. The juniper woodlands are particularly dense. It is presumed that before widespread fire suppression, the area was less wooded and more savannah-like.

— EPA

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