Lower Ordovician Conodonts in North America

New uppermost Cambrian U–Pb date from Avalonian Wales and age of the Cambrian–Ordovician boundary

“…Similarly, a correlation of the lowest Tremadoc with the overlying lower conodont Fauna B interval (Ethington & Clark, 1971), proposed by Landing (1984), is supported by subsequent work (e.g. Barnes, 1988;Bruton, Koch & Repetski, 1988).…”

Ordovician conodonts from the Thong Pha Phum area, western Thailand

“…Other characteristic species include Protopanderodus floridus Bagnoli and Stouge, Drepanoistodus forceps (Lindström), Scandodus brevibasis (Sergeeva), Ansella nevadensis (Ethington and Schumacher), ramiform element A, and coniform element A and B. P. floridus has been described from the middle Arenigian in Sweden (Bagnoli and Stouge, 1997). S. brevibasis has been reported from the late Arenigian in Argentina (Serpagli, 1974) and North America (e.g., Ethington and Clark, 1971). A. nevadensis is known from the Lower to Middle Ordovician in North America (Ethington and Schumacher, 1969;McCracken, 1991).…”

Ordovician biostratigraphy of the Canning Basin, Western Australia

“…Paltodus inconstans and Paroistodus proteus appear for the first time in fauna 2; in the Baltoscandian region both species are characteristic of the Paroistodus proteus Zone which Lindstrom (1971) has equated with the Hunneberg. McTavish (1973) has discussed the correlation of this conodont fauna with the Hunneberg substage in some detail and has noted the similarity of the fauna to Fauna D of North America (Ethington & Clarke, 1971). …”