Cambrian (Guzhangian Stage) trilobites from Ohio, USA, and modification of the Cedaria Zone as used in Laurentia

摘要: Two Cambrian trilobites, Olenoides? sp. from the Mount Simon Sandstone and “Cedaria” woosteri Eau Claire Formation, are described subsurface of western Ohio, USA. The definition Cedaria Zone is modified to reflect differing interpretations zone as used historically in restricted-shelf open-shelf lithofacies Laurentian palaeocontinent. prolifica proposed for use primarily lithofacies, “C.” more restricted, inner-shelf lithofacies. Formation interpreted representing C. Zone, eponymous species Zone. Both polymerid trilobite biozones Guzhangian Stage (Cambrian, provisional Series 3). Based on zonation, most Ohio being age.