Where: Ticino, Switzerland (45.9° N, 9.0° E: paleocoordinates 8.8° N, 20.1° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Grenzbitumenzone Formation, Ladinian (242.0 - 235.0 Ma)

• Secedensis Zone? Guide event for Anisian-Ladinian boundary is undecided - proposals include the base of the Curionii Zone, base of Avisianum Subzone (Reitzi Zone), and base of Reitzi Zone. These collections use the base of the Reitzi Zone as the A-L boundary.

• group of beds-level stratigraphic resolution

Environment/lithology: basinal (); dolomite

Size class: macrofossils

Collection methods: surface (in situ),

Primary reference: P. Brack and H. Rieber. 1993. Towards a better definition of the Anisian/Ladinian boundary: new biostratigraphic data and correlations of boundary sections from the Southern Alps. Eclogae Geologicae Helvetiae 86(2):415-527 [D. Bottjer/M. Clapham/M. Clapham] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 44625: authorized by David Bottjer, entered by Matthew Clapham on 15.09.2004