Location:The GSSP is located at Bagolino (Province of Brescia, Northern Italy) in the eastern Lombardian Alps, in Valle del Caffaro between Val Camonica and Valli Giudicarie. The Anisian/Ladinian boundary succession is well exposed at three sites (A – C) in the bed of the river Caffaro, in the surroundings of the Romanterra Bridge, south of the village of Bagolino. The GSSP Site is situated close to the eastern end of Site B and its coordinates are 614.276 / 5075.118 (UTM-grid) and Long./Lat. 45°49'09.5"N, 10°28'15.5"E respectively.
The GSSP Site (= Site B) is situated approximately 150m ESE of the Romanterra Bridge.
Sedimentology:At Bagolino, the pelagic succession consists from bottom to top of the Angolino Limestone. the Prezzo Limestone, the Buchenstein Beds and the Wengen Beds.
The Buchenstein Beds consist of siliceous pelagic nodular limestones and up to a few decimetres thick volcaniclastic layers which can be traced laterally on a regional scale. A marked change in sedimentation is observed at the top of the Buchenstein Beds with the abrupt switch to the predominantly siliciclastic Wengen Beds.
The Anisian/Ladinian boundary interval comprises the "transitional beds" and the lower part of the Buchenstein Beds and is best exposed at Sites A - C. In particular, at the eastern end of Site B the fully exposed strata from the 57m-level upward can be traced over several tens of metres along strike.
The GSSP level at Bagolino is defined in the lower part of the Buchenstein Beds, around 5m above its base, at the top of a distinct 20-25cm-thick interval of limestone nodules in a shaly matrix in contact (upwards) with several thick limestone beds