Sequatchie Cave is a 10-acre, biologically significant, natural area where Owen Spring Branch flows from the mouth of the cave at Sequatchie Cave Park in Marion County. The cave and its cold spring water support three federally and state listed species, three species of state concern, and many other aquatic and cave species. This is one of two sites where the federally endangered royal snail (Pyrgulopsis ogmorphaphe) is known in the world. Both are in Marion County. This is also the site where the rare caddisfly (Glyphopsyche sequatchie) was first described, making it the type locality for this species from which the official description derives. Public access is allowed but is limited. The natural area is operated by Marion County Government. Parking and a picnic area are available. Cave trips must be coordinated through the Division of Natural Areas.
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