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Swiss Journal of Geosciences
Fig. 6 | Swiss Journal of Geosciences

Fig. 6

From: Record of a dense succession of drowning phases in the Alpstein mountains, northeastern Switzerland: Part II—the Lower Cretaceous Schrattenkalk Formation (late Barremian)

Fig. 6

Echinoids of biostratigraphical value present in the uppermost Hauterivian to lower Aptian series (Tierwis Formation, Schratenkalk Formation and Garschella Formation pro parte) of the Alpstein massif. A Toxaster seynensis (Lambert, 1920), drawing by Lambert (1920) and organization of the pores of the odd ambulacrum according to Clavel in Charollais et al. (2009). B Heteraster oblongus (Brongniart, 1821), drawing by d’Orbigny (1853–1855). C Heteraster peroni (Ficheur, 1900), drawing by Ficheur (1900)

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