Cave Hill

Status
Established
Year Established
1990

Location

State
Illinois
National Forest Regions
Eastern Region (R9)
National Forest RNA sign a boundary of the Cave Hill Research Natural Area. Photo taken by Larry Fitchter of Elizabeth Shimp by sign, Shawnee National Forest Botanist

Ecological and Physical Description

Size
465ac (188ha)
Elevation Range
475' (145m) - 923' (281m)
Temperature Range
-6°F (-21°C) - 100°F (38°C)
Primary Features

Cave Hill RNA contains relatively undisturbed examples of xeric upland forest, dry upland forest, dry-mesic upland forest, barrens, sandstone glades, and sandstone cliff community types. There is a cave within the RNA known as Equality Cave (or Cave Hill Cave) that is a significant example of a maze cave in the Interior Low Plateaus Physiographic Province. The cave is also significant for its terrestrial cave community and aquatic cave habitats. The Federally listed threatened Mead's Milkweed (Asclepias meadii) occurs in the area. In addition, the following five Shawnee National Forest Listed species are found in the area: chestnut oak (Quercus prinus), Carolina thistle (Cirsium carolinianum), Bradley’s spleenwort (Asplenium bradleyi), and two species of lichen, Usnea sp., and Ramalina sp.

Annual Precipitation

Average annual precipitation is about 42 inches (106 cm), ranging from 25 to 72 inches (62.5-180 cm). Precipitation is fairly evenly distributed throughout the year with September and October being the driest months. The average annual snowfall is approximately 12 inches (30.4 cm).

Nearest Weather Station

The climatological data are from the collection station at Harrisburg, which is located 8 miles (12.9 km) west-northwest of the RNA.

Geology and Soils

Cave Hill RNA is on the north slope of the Shawnee Hills, and is a landform between a cuesta and a hogback along a fault line scarp. Cave Hill itself is composed of: (1) massive, somewhat conglomeritic sandstone, (2) sandstone alternating with shale layers on the ridge crest and back slope, and (3) shale and limestone on the scarp face. The Pennsylvanian Caseyville Sandstone forms the resistant rock of the ridge crest. Soils are thin, stony and droughty. Organic content is low and the hazard of erosion severe. The Berks-Wellston complex is mapped on the upper slope of the escarpment and the Zanesville silt loam is on the gentler slopes of the northwest edge of the RNA.

Aquatic Features

Drainage from Cave Hill RNA is into the Saline River, a tributary of the Ohio River. Although there are no lakes or rivers on the RNA, groundwater has formed the extensive network system of Equality Cave. The cave consists of three to five parallel passages with many intersecting passages. The deepest passage carries a stream.

Flora and Fauna

Common Plant Species

Common Animal Species

Last updated February 8, 2023