Trace fossils from arenig flysch sediments of eire and their bearing on the early colonisation of the deep seas

摘要: A sequence of Lower Ordovician (Arenig) turbidites in Co. Wexford, Eire, has yielded one the earliest diverse ichnofaunas yet recorded from deep water sediments comprising: Chondrites, Glockerichnus, Gordia, Helminthopsis, Lorenzinia, Neonereites, Palaeophycus, Paleodictyon, Planolites, Sublorenzinia, Taenidium, Taphrhelminthopsis, Teichichnus and Tomaculum. This ichnofauna is critical any analysis colonisation seas by trace fossil‐producing animals. world‐wide review shows that fossils are mainly Late Precambrian shelf sea environments, but many more evolved during very rapid diversification pre‐trilobite Cambrian. There was little increase diversity shallow after Cambrian a progressive ocean took place this accelerated Ordovician, when main lineages were established there. Rosetted, patterned, meandering simple spiral forms shallow...