The lower boundary of the Floian is defined as the first appearance of Tetragraptus approximatus, a graptolite species.
It is unusually fossiliferous, including fossilized remains of graptolites, conodonts, and trilobites.
The Floian stage is named after Flo Parish, a village 5 km to the southeast of the Diabasbrottet quarry.
It was selected over "The Ledge" in western Newfoundland in 2000 and ratified as the GSSP by the International Union of Geological Sciences in 2002.
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