Minor weathering forms on the Roraima Quartzite in the Carrao River Basin of Southeastern Venezuela have the appearance of the karren that form on limestone surfaces in karst terrains. Climatological and chemical evidence indicates that these forms were generated by a solutional mechanism and that this area thus exhibits a minor karst topography on quartzite.
White, William B.; Gene L. Jefferson; and Jon F. Haman.
Quartzite karst in Southeastern Venezuela.
International Journal of Speleology,
Available at: http://scholarcommons.usf.edu/ijs/vol2/iss4/1