Fig. 14From: The Staffelegg Formation: a new stratigraphic scheme for the Early Jurassic of northern SwitzerlandDetailed section of the Early Jurassic strata at Hof Horn (NW Olten). α = whitish and bluish chert nodules (see also Moesch 1874; Buxtorf 1907; Fischer and Luterbacher 1963: 28); β = Arnioceras sp., Arnioceras cf. cuneiforme Hyatt, Arnioceras cf. robustum (Quenst.); γ = Coroniceras multicostatum (Sow.), loosely collectedBack to article page