Geological State Symbols Across America  Geology of the National Parks Through Pictures

Back to


Next Step Across America

Texas State Geological Symbols
Year Est.
State Stone
Petrified Palmwood
State Gem
Texas Blue Topaz
State Dinosaur
Paluxysaurus Jonesi
State Precious Metal


State Stone: Petrified Palmwood

Petrified wood is not actual wood, however it was wood at one point. Petrified wood is a fossil that formed from pieces of wood that have been mineralized. Mineralization is a process where groundwater moves through the wood and replaces all of the wood molecules with molecules of other substances, most often silica (i.e. quartz). This means that petrified wood actually isn't wood anymore, but a fossil of the former wood.


Related: Arizona State Fossil - Petrified Wood (Araucarioxylon arizonicum); Louisiana State Fossil: Petrified Palmwood; Mississippi State Stone: Petrified Wood; North Dakota State Fossil: Teredo Petrified Wood; Washington State Gem: Petrified Wood


State Gem: Texas Blue Topaz


State Dinosaur: Paluxysaurus Jonesi


State Precious Metal: Silver




Geology of Texas's National Parks

Through Pictures

(at least the one's I have been to)

Alibates Flint Quarries National Monument

San Antonio Missions National Historical Park


National Parks visited but I have no pictures (at this time) to do a geology post

(link directs to NPS site)

Chamizal National Memorial (2004)

Lake Meredith National Recreation Area (2005)

Lyndon B. Johnson National Historical Park (2005)


Alibates Flint Quarries National Monument

Visited in 2005



San Antonio Missions National Historical Park

Visited in 2005