RNA: Western Cross Timbers
County: Wise County
Forest: Lyndon B. Johnson National Grassland, National Forests in Texas
District: Caddo-L.B.J. National Grasslands
Established: 1977; Acres: 370
To view Establishment records for Cross Timbers RNA in PDF format, Click Here
Click here, to view a searchable map for the Cross Timbers RNA
Physical and Climatic Conditions
Nearest weather station, with distance and direction from RNA: information not available
Annual precipitation (type, seasonal distribution): information not available
Maximum and minimum temperatures: information not available
Elevation: 1100 ft.
Geology and Soils: The RNA is within the transition zone between soils of calcareous origin (Grand Prairie, 10%) and soils of arenaceous origin (Western Cross Timbers, 90%). Limestone mesas in the area contain some surface material suitable for road surfacing, but none has been removed. The topography is gently rolling with steeper slopes up to 20% in grade.
Aquatic Features: Drainage is generally to the north
Plant Communities: The RNA contains soils and vegetation of two major vegetation zones in Texas, the Western Cross Timbers and the Grand Prairie. Little of the Western Cross Timbers vegetation remaining today is representative of the original composition, but the RNA contains vegetation similar to the original. The Western Cross Timbers section of the RNA is composed of oak savannah with post oak (Quercus stellata), blackjack oak (Q. marilandica), live oak (Q. virginiana) and juniper (Juniperus sp.). The Grand Prairie vegetation is open grassland with scattered clumps of live oaks.
SAF Cover Types:
Oak savannah, Type 69 and Type 84
At Risk Species: None are known
Common Shrub Species: Common shrubs include wild plum (Prunus angustifolia), sumac (Rhus spp.), greenbrier (Smilax spp.) and others.
Common Herbaceous Species: There are mixed mid and tall grasses in the understory and openings. Little bluestem (Andropogon scoparius) is the most common grass and there is a sparse component of forbs and shrubs.
Common Mammal Species:
A number of native wildlife species characteristic of prairie and oak-savannah inhabit the RNA. The only large species present today is the white-tailed deer (Odocoileus virginianus), but in the past, bison (Bison bison bison), black bear (Ursus americanus), gray wolf (Canis lupus), antelope (Antilocapra americana) and other species occurred in the area. A list is included in the Establishment Record.
Common Bird Species: Quite a few seasonal, permanent and migrating birds inhabit the RNA. A list is included in the Establishment Record.
Related Reports and Publications:
Additional reports and publications can also be found by clicking on the “RNA Publications and Products” link in the site menu or by clicking here.
Ezell, A.H. 1980. An ecological evaluation of the Western Cross Timbers Research Natural Area. USDA Forest Service, Southern Forest Experiment Station. 98 pp.
Quinn, W.J. 1996. A study of the vegetation of the Western Cross Timbers Research Natural Area. Unpublished Report.
Last Modified: 9/21/2015 by Margaret Devall (firstname.lastname@example.org)