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Arbuckle Uplift

Ecoregion in OK

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Tall grass prairie and oak savanna are native to the rolling hills and plains of the Arbuckle Uplift, and developed over a unique mosaic of limestone, granite, dolomite, sandstone, and shale. Upland soils that were derived from limestone are usually shallow, moisture deficient, and erodible if disturbed; they are extensive and are now used as grazing land. Upland soils that developed from granite are sufficiently deep to permit farming. Cropland is common on floodplains. Stream substrates are typically composed of gravel, cobble, bedrock, or, particularly in the east, coarse sand. Most streams have some spring influence and many are dominated by spring flow, especially in the summer. Perennial, clear, cool streams are common. Springs are especially common in limestone. Streams typically have low turbidity and support a fish fauna that is distinct from neighboring Ecoregions 29a, 29b, 29c, and 37e. Fish and macroinvertebrate species richness is higher than elsewhere in the Cross Timbers (29), but less than in the Lower Canadian Hills (37e). Granite does not influence water quality or water quantity nearly as much as limestone in the Arbuckle Uplift (29g), but, where it is at the surface, vernal pools occur and contain primitive arthropods.

— EPA

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