Palynomorphs from the graptolite zone (Early Wenlock, Silurian), Bornholm

Palynomorph assemblages recovered from the Cyrtograptus centrifugus graptolite zone on Bornholm contain moderately diverse acritarchs and prasinophycean algae, and minor chitinozoans and miospores. The generally poor preservation is due mainly to a high thermal alteration of the sediments. The indentified Early Wenlock (Sheinwoodian) palynomorph assemblages are closely related to those de-scribed from contemporaneous deposits elsewhere in northwest Europe and U.S.S.R., and they are characterized by common representatives of the genera Leiosphaeridia, Diexallophasis, Oppilatala, Salo­pidium and Michystridium. The palynomorph assemblages herein described are similar to the marine floras from the open marine deep water deposits of the Wenlock carbonate shelf of the Welsh Borderland and Midlands of England as described by Dorning and Bell (1987) (the Saliopidium granuliferum Assemblage). The presence of Doinasia elongata and Domasia trispinosa, together with ?Deunffia sp. confirm that the Early Wenlock deposits on Bornholm are coeval with the Deunffia - Domasia facies proper as defined by Cramer (1970, 1971, 1971a).