Name
Image
Date
Location
County
Ownership
Description
1
Attwater Prairie Chicken Preserve
1968
29°40′08″N 96°16′00″W / 29.668827°N 96.266751°W / 29.668827; -96.266751 (Attwater Prairie Chicken Preserve )
Colorado
federal/US Fish & Wildlife Service
Contains the only significant segment of gulf coastal prairie.
2
Bayside Resaca Area
1980
26°13′45″N 97°20′50″W / 26.229081°N 97.347231°W / 26.229081; -97.347231 (Bayside Resaca Area )
Cameron
federal/US Fish & Wildlife Service
Located in Laguna Atascosa National Wildlife Refuge , contains an excellent example of a resaca .
3
Catfish Creek
1983
31°54′27″N 95°54′09″W / 31.90750°N 95.90250°W / 31.90750; -95.90250 (Catfish Creek )
Anderson
state/Texas Department of Parks and Wildlife
One of the few remaining undisturbed riparian habitats in the western Gulf Coastal Plain
4
Caverns of Sonora
1965
30°33′18″N 100°48′44″W / 30.55500°N 100.81222°W / 30.55500; -100.81222 (Caverns of Sonora )
Sutton
private
Contains unusual formations, such as bladed helictites and coralloid growths
5
Devil's Sinkhole
1972
30°00′57″N 100°12′31″W / 30.015773°N 100.208552°W / 30.015773; -100.208552 (Devil's Sinkhole )
Edwards
state/Texas Department of Parks and Wildlife
A deep, bell-shaped, collapsed limestone sink.
6
Dinosaur Valley State Park
1968
32°14′46″N 97°48′48″W / 32.246194°N 97.813375°W / 32.246194; -97.813375 (Dinosaur Valley State Park )
Somervell
state/Texas Department of Parks and Wildlife
The only known source of distinct and full-grown sauropod footprints.
7
Ezell's Cave
1971
Hays
private
Houses at least 36 species of cave fauna.
8
Enchanted Rock
1971
30°29′46″N 98°49′12″W / 30.496033°N 98.819952°W / 30.496033; -98.819952 (Enchanted Rock )
Gillespie , Llano
state/Texas Department of Parks and Wildlife
A classic illustration of a batholith and of the exfoliation process.
9
Fort Worth Nature Center and Refuge
1980
32°50′36″N 97°28′38″W / 32.843450°N 97.477225°W / 32.843450; -97.477225 (Fort Worth Nature Center and Refuge )
Tarrant
municipal/City of Fort Worth
Contains outstanding examples of the unique oak-hickory forest associations called cross timbers.
10
Greenwood Canyon
1975
Montague
private
A rich source of early Cretaceous mammalian fossils.
11
High Plains Natural Area
1980
34°55′10″N 102°06′40″W / 34.919517°N 102.111118°W / 34.919517; -102.111118 (High Plains Natural Area )
Randall
federal/US Fish & Wildlife Service
One of the best developed, least disturbed natural shortgrass climax communities remaining in the Great Plains. Part of Buffalo Lake National Wildlife Refuge .
12
Little Blanco River Bluff
1982
Blanco
private
An unspoiled example of the limestone bluff communities of the Edwards Plateau .
13
Longhorn Cavern
1971
30°41′04″N 98°21′03″W / 30.684441°N 98.350970°W / 30.684441; -98.350970 (Longhorn Cavern )
Burnet
state/Texas Department of Parks and Wildlife
State park contains an outstanding example of cave features formed during the phreatic phase of development.
14
Lost Maples State Natural Area
1980
29°48′28″N 99°34′15″W / 29.807719°N 99.570697°W / 29.807719; -99.570697 (Lost Maples State Natural Area )
Bandera , Real
state/Texas Department of Parks and Wildlife
An excellent illustration of Edwards Plateau flora and fauna.
15
Muleshoe National Wildlife Refuge
1980
33°57′19″N 102°46′37″W / 33.955295°N 102.776973°W / 33.955295; -102.776973 (Muleshoe National Wildlife Refuge )
Bailey
federal/US Fish & Wildlife Service
Saline lake beds, and shortgrass grama grasslands characteristic of the high plains.
16
Odessa Meteor Crater
1965
31°45′25″N 102°28′45″W / 31.756998°N 102.479125°W / 31.756998; -102.479125 (Odessa Meteor Crater )
Ector
county
Contains two meteorite impact craters. The largest is 550 feet (170 m) in diameter.
17
Palo Duro Canyon State Park
1976
34°59′05″N 101°42′07″W / 34.984709°N 101.701867°W / 34.984709; -101.701867 (Palo Duro Canyon State Park )
Armstrong , Randall
state/Texas Department of Parks and Wildlife
Spectacular canyon that is an excellent example of a landform created by running water.
18
Santa Ana National Wildlife Refuge
1966
26°05′07″N 98°08′04″W / 26.08522°N 98.13448°W / 26.08522; -98.13448 (Santa Ana National Wildlife Refuge )
Hidalgo
federal/US Fish & Wildlife Service
A living museum of the lowland forested area of the Lower Rio Grande Valley.
19
Natural Bridge Caverns
1971
29°41′32″N 98°20′34″W / 29.692351°N 98.342760°W / 29.692351; -98.342760 (Natural Bridge Caverns )
Comal
private
A multilevel cavern system containing unusual speleothems and intricate helictites .
20
Cave Without a Name
2009
29°52′45″N 98°38′31″W / 29.8791769°N 98.6419260°W / 29.8791769; -98.6419260 (Cave Without a Name )
Kendall
private
Contains rare and nationally outstanding examples of speleothems.