Frogdenites, the early Sphaeroceratid ammonite from the lower Bajocian of the Bakony and Gerecse Hills, Hungary

Galácz, András (2001) Frogdenites, the early Sphaeroceratid ammonite from the lower Bajocian of the Bakony and Gerecse Hills, Hungary. Hantkeniana, 3. pp. 41-47. ISSN 1219-3933

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Abstract

Genus Frogdenites and its two species are described on the basis of new finds from the Bajocian of Hungary. The study supports the previously suggested conclusions on systematic and stratigraphy• the genus, which represents the earliest member of the family Sphaeroceratidae, is a rare, but very good index of the topmost part of the Laeviuscula Zone. Dimorphism is demonstrated in both species, with a very low size ratio between macro- and microconchs.

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