The lightning whelk is the official state shell of Texas. It has a tan or gray shell with brown streaks and an unusual counterclockwise spiral. Texas produces more wool than any other state, mainly from the Edwards Plateau region. The oldest tree in the state is a coastal live oak near Fulton estimated to be over 1,500 years old. Caddo Lake is the only natural lake in Texas and features unusual cabins built in the 1930s. The King Ranch in Texas is nearly as large as Rhode Island and was founded in 1853. The Tyler Municipal Rose Garden has over 38,000 rose bushes representing 500 varieties and is the world's largest rose garden. Amarillo has the world's largest he