Abstract Thirty Devonian-Carboniferous Boundary sections of the Rhenish Slate Mountains and adjacent subsurface areas are reviewed with respect to litho-, event, conodont, ammonoid, sequence, chemostratigraphy. In interval from base uppermost Famennian (Wocklum Beds, Wocklumian) middle Tournaisian (base Lower Alum Shale), 11 conodont 16 ammonoid (sub)zones distinguished. The terminology Hangenb...