Arenigian

Arenigian

[‚a·rə′nij·ē·ən]
(geology)
A European stage including Lower Ordovician geologic time (above Tremadocian, below Llanvirnian). Also known as Skiddavian.
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Arenigian shallow-marine clastic sediments of Western Europe, North Africa, South America and some parts of North America are characterized by abundant trace fossils, including large Cruziana, an ichnogenus first described from such deposits in Bolivia (d'Orbigny, 1842).
Cruziana imbricata is common in the Arenigian in association the Cruziana rugosa group (Seilacher, 1970).
The Arenigian occurrence extends its stratigraphic range.
Conodont faunas with Lenodus variabilis in the Upper Arenigian to Lower Llanvirnian of Sweden // Acta Palaeontol.
3), and interpreted the age as "may range from early Middle Arenigian to earliest Llanvirnian", thus supporting the Arenigian brachiopod age interpretation of Neuman (1968).
Early growth stages of Arenigian Baltoscandic Orthocerida Mollusca, Cephalopoda.
Conodonts from the limestone and brachiopods from associated calcareous siltstone, together with U-Pb dating of the crystal tuff, indicate that the Nepisiguit Falls Formation is late Arenigian in age; graptolites from black shale of the Little River Formation are late Caradocian in age.
The presence of early Ordovician (late Tremadocian to early Arenigian) graptolites in the underlying Bright Eye Brook Formation of the Woodstock Group (see above) and Late Ordovician (early Caradocian) graptolites in the overlying Belle Lake Formation of the Meductic Group (see below) restricts the depositional range of the volcanic components (Porten Road, Eel River, and Oak Mountain formations) of the Meductic Group to between early Arenigian and Llanvirnian time.
Arenigian acritarchs from the Daping section (Yangtze Gorges area, Hubei Province, Southern China) and their palaeogeographic significance.
Stratigraphical significance of the late Tremadocian and Arenigian graptolites of the Middle East Baltic area.