Fig. 7
From: The Staffelegg Formation: a new stratigraphic scheme for the Early Jurassic of northern Switzerland
Detailed section of the Early Jurassic strata at Frick (Gruhalde clay pit). α = position of the boundary between Late Hettangian and Early Sinemurian sensu Hoffmann (1934), Walliser (1956a,b) and Schlatter in Maisch et al. (2008); β = position of the boundary between Late Pliensbachian and Early Toarcian sensu Schlatter (1982), Riegraf et al. (1984) and Kuhn and Etter (1994: Basisschicht); γ = Promicroceras cf. planicosta (Sow. 1814) at 7.63 m and 9.22 m (W. Etter, pers. comm. 2005); δ = Promicroceras cf. planicosta (Sow. 1814) at 16.98 m (W. Etter, pers. comm. 2005); ε = Asteroceras sp. at 15.72 m (W. Etter, pers. comm. 2005); ζ = “Schlotheimia cf. extranodosa” (see Maisch et al. 2008: fig. 3); η = revision of “Psiloceras (Caloceras) cf. johnstoni (Sow. 1824)” (see Maisch et al. 2008: fig. 3); π = compare Etzold et al. (1975); ψ = biostratigraphic range according to Jordan (1960) and Schlatter (1991)