Base of Floian true Graptolite FAD Tetragraptus approximatus Episodes 27/4, p. 265 272, 2004 Diabasbrottet, Hunneberg, Sweden in the lower Tøyen Shale, 2.1m above the top of the Cambrian Stratotype Point Base of Floian Ratified 2002 Stratotype Point Base of Floian Location of Stratotype Point Base of Floian