Cactolith (cac'-to-lith)

An irregular intrusive igneous body of obscurely cactuslike form, more or less confined to a horizontal zone and appearing to consist of irregularly related and possibly distorted branching and anastamosing dikes that fed a laccolith. Term introduced by Hunt et al. (1953, p. 151): "a quasi-horizontal chonolith composed of anastamosing ductoliths whose distal ends curl like a harpolith, thin like a sphenolith, or bulge discordantly like an akmolith or ethmolith".
- Glossary of Geology, 3rd ed., (Bates and Jackson, 1987)

C.B. Hunt, et al., 1953, Geology and geography of the Henry Mountains region, Utah. U.S.G.S. Professional Paper 228. 234 p.