Rare Petrified Snakewood Mennegoxylon Texas. Snakewood (mennegoxylon jonesii) Large Brazos county, Texas Yegua formation Eocene 13″×7.5″ and 9/16 thick. Rare species of extinct tree only found fossilized in the Yegua formation, of Texas and where it extends into Lousiana. This is a large slab that came off a stump with root traces. Not much is […]