Abstract

The Jurassic of Minorca is known from a composite section described from outcrops on the Cape of Fornells and on the Atalaya de Fornells peninsula. The Liassic is primarily a microcrystalline dolomite; the middle Jurassic, containing Orbitammina (Dictyoconus) cayeuxi (Lucas), is composed of dolomites containing large dolomite crystals, and always displaying oolitic texture; the upper Jurassic consists of limestone and microcrystalline dolomites. Comparison of the Orbitolinidae genera, Meyendorffina and Coskinolina, does not reveal significant differences between the two, therefore justifying the reduction of Meyendorffina to the rank of subgenus in the genus Coskinolina. Coskinolina (Meyendorffina) bizonorum, n. sp., C. (M.) minoricensis n. sp., and C. (M.) sp. 1 are described and figured. The beds containing Meyendorffina, which lie between the middle and upper Liassic brachiopod marls and the upper Jurassic limestones with Valvulinella sp., are assigned to the Dogger, possibly the upper part, on the basis of 'Dictyoconus' cayeuxi (also figured).

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