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Bastrop Lost Pines
Ecoregion
in
TX
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The Bastrop Lost Pines ecoregion is an outlier of relict loblolly pine-post oak upland forest occurring on some dissected hills. It is the westernmost tract of southern pine in the United States. The pines mostly occur on gravelly soils that formed in Pleistocene high gravel, fluvial terrace deposits associated with the ancestral Colorado River, and sandy soils that formed in Eocene sandstones (Sparta Sand, Weches Formation, Queen City Sand, Recklaw Formation, and Carrizo Sand). The Lost Pines are about 100 miles west of the Texas pine belt of Ecoregion 35 and occur in a drier environment with 36 inches of average annual precipitation. In this area, the deep, acidic, sandy soils and the additional moisture provided by the Colorado River contribute to the occurrence of pines, which are thought to be a relict population predating the last glacial period. Other areas of loblolly pines appear within parts of 33b, but are mostly too small to map at this scale.
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