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Post Oak-Blackjack Forest
In the center of the state towering trees bow out to the cross-timbers-dense, gnarled patches of drought-resistant post and blackjack oaks. In 1832, Washington Irving called them "forests of cast iron." Later, cowboys driving herds along the Chisholm and Shawnee trails gave this forest its existing name. The timbers snagged cattle as they attempted to cross.