The Diabasbrottet Quarry (Mt. Hunneberg, Västergötland, Sweden, is the location of the Global Boundary Stratotype Section and Point (GSSP) which marks the lower boundary of the Floian stage of the Lower Ordovician.), located on
The lower boundary of the Floian is defined as the first appearance of Tetragraptus approximatus, a graptolite species. The rock section, dominated by shale, is unusually fossiliferous, including fossilized remains of graptolites, conodonts, and trilobites. It is highly compressed, and the Ordovician section is only 12 m thick.
- "The Ordovician System" (DOC). Retrieved 2006-06-30.
- Bergström, Stig M.; Anita Löfgren; Jörg Maletz (December 2004). "The GSSP of the Second (Upper) Stage of the Lower Ordovician Series: Diabasbrottet at Hunneberg, Province of Västergötland, Southwestern Sweden" (PDF). Episodes (274): 265–272. Retrieved 2006-06-30.
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