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n.1.(Paleon.) A genus of trilobites found in the Lower Silurian formation. See Illust. in Append.
References in periodicals archive ?
The trilobite fauna of baksteenkalk, too, shares several species with the Idavere and Johvi stages in Estonia (Roomusoks 1970; Neben & Krueger 1973), such as Chasmops marginatus, Bolbochasmops emarginatus, Oculichasmops muticus, Otarozoum peri, Illaenus jewensis, Atractopyge dentata, Hemisphaerocoryphe pseudohemicranium, Nieszkowskia ahtioides, Achatella kegelensis, Asaphus (Neoasaphus) sp.
limbata, and Asaphus priscus and is thus a correlative of the Planilimbata- and Limbatakalk in Sweden and Norway (Lamansky 1905, p.
Proasaphus is possibly the ancestor of Asaphus Brongniart (Tjernvik 1956, p.
The lower part, up to the base of the Asaphus expansus Zone, is typically calcilutitic, without observable grains, whereas the upper, Kundan, part is fine-grained calcarenitic, indicative of a higher-energy depositional environment (Jaanusson 1982b, p.
47) suggest that the beginning of the Kundan Age (corresponding to the base of the Asaphus expansus Zone) coincided with a lowstand, and his sea-level curve shows a shallowing event (Nielsen 1995, p.
The Central Baltoscandian Confacies Belt has a sparse fauna including, among others, a single Asaphus species and some large species of Megistaspis (Bohlin 1960).
are known both from the west and the east, whereas Asaphus lepidurus, Megistaspis hyorrhina, M.
The Volkhovian contains Ampyx nasutus, Ptychopyge plautini, Asaphus lepidurus, Megistaspis 'limbata ' and M.
Notably, the genus Asaphus, so important in Baltoscandia, is virtually absent, and only a single nileid is reported.