Alert

Practice social distancing even when outdoors.

Please follow guidance from the Centers for Disease Control and Prevention (CDC) and the Texas Department of State Health Services.

Check the status of the location you're planning to visit.

Some Texas state parks, TPWD offices, public recreation facilities and water access points are closed.

See list of temporary closures and operations adjustments.

 

Part IV: Earth Sciences


Butterfly Calcite

Additional Information:

Ilo Hiler
1983 Part IV: Earth Sciences. Young Naturalist. The Louise Lindsey Merrick Texas Environment Series, No. 6. Texas A&M University Press, College Station.