 The highest and thickest rock layer belongs to reed sandstones ("Stuttgart-Formation") of the Carnian stage.The Red Main is a habitat for brown trout, grayling, barbel, bullhead, lamprey, carp, tench, carp bream, roach, perch, pike, pike-perch, eel and burbot.The Red Main Trail ("Rotmainweg"), which was laid out by Fichtelgebirge Club, begins near the source.