Biostratigraphy and sequence stratigraphy of the Toarcian Ludwigskanal section (Franconian Alb, Southern Germany)

1. Lytoceras sublineatum (Oppel), 38 cm below top of bed 16, Variabilis Subzone, Posidonienschiefer Formation. The telescope-like, shallow constrictions in this juvenile specimen are reminiscent of Pleurolytoceras propehircinum Krumbeck of the Aalensis Subzone, but the high wb/wh ratio points to Lytoceras sublineatum (Oppel). GZG.INV.70518: d = 17 mm, di = 10.5 mm, u = 5 mm, wh = 7.5 mm, wb = 10 mm, rb/2 = 10. 2. Catacoeloceras raquinianum (d’Orbigny), 19 cm below top of bed 16, Variabilis Subzone, Posidonienschiefer Formation. GZG.INV.70519: d = 45 mm, di = 35 mm, u = 21 mm, wh = 12.5 mm, wb = 16 mm, rb/2 = 18. 3. Catacoeloceras raquinianum (d’Orbigny), 13 cm below top of bed 16, Variabilis Subzone, Posidonienschiefer Formation. GZG.INV.70520: d = 35 mm, di = 26 mm, u = 14 mm, wh = 11.5 mm, wb = 15 mm, rb/2 = 13. 4. Pseudogrammoceras subregale (Pinna), 4 cm below top of bed 18, Illustris Subzone, Jurensismergel Formation. GZG.INV.70521; d = 107 mm, di = 77 mm, u = 46 mm, wh = 34 mm, wb = n.a., rb/2 = (48). 5. Haugia cf. phillipsi (Simpson), 3 cm below top of bed 18, Illustris Subzone, Jurensismergel Formation. GZG.INV.70522; d = (125 mm), di = n.a., u = n.a., wh = 46 mm, wb = n.a., rb/2 = (22). 6. Catacoeloceras raquinianum (d’Orbigny), basis of bed 19, Variabilis Subzone, Posidonienschiefer Formation. GZG.INV.70523: d = 62 mm, di = 49 mm, u = 31 mm, wh = 15 mm, wb = (16 mm), rb/2 = 13. 7. Osperleioceras bicarinatum (Zieten), phosphorite nodule in bed 20, condensed transition Variabilis-Thouarsense Zone, Jurensismergel Formation. GZG.INV.70524: d = 25 mm, di = 15 mm, u = 3.5 mm, wh = 14 mm, wb = 6 mm, rb/2 = (18). 8. Lytoceras cornucopia (Young & Bird), marl matrix of bed 20, condensed transition Variabilis-Thouarsense Zone, Jurensismergel Formation. GZG.INV.70525: d = 66 mm, di = 46 mm, u = 23 mm, wh = 27 mm, wb = (28 mm), rb/2 = n.a. 9. Denckmannia rude (Simpson), phosphorite nodule in bed 20, condensed transition Variabilis-Thouarsense Zone, Jurensismergel Formation. GZG.INV.70526: d = 86 mm, di = 58 mm, u = 32 mm, wh = 32 mm, wb = (26 mm), rb/2 = n.a.