Fig. 1From: Middle Triassic Nautilida from the Besano Formation of Monte San Giorgio, SwitzerlandStratigraphic section of the Besano Formation at Point 902/ Mirigioli (modified after Röhl et al., 2001, Fig. 4). The stratigraphic positions of five described specimens are indicated beside this section and the distribution of some ammonoids (after Rieber, 1973a, 1973b) from the same levels (indicated in grey)Back to article page