Arenigian

Arenigian

[‚a·rə′nij·ē·ən]
(geology)
A European stage including Lower Ordovician geologic time (above Tremadocian, below Llanvirnian). Also known as Skiddavian.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Conodont faunas with Lenodus variabilis in the upper Arenigian to lower Llanvirnian of Sweden.
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).
(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).
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.
Early growth stages of Arenigian Baltoscandic Orthocerida Mollusca, Cephalopoda.
Arenigian acritarchs from the Daping section (Yangtze Gorges area, Hubei Province, Southern China) and their palaeogeographic significance.
serratus Zone up into the Arenigian. Saltaspis viator is a lower Hunnebergian species in Baltoscandia and confirms that the sequence includes a basal Asaphid fauna.
Stratigraphical significance of the late Tremadocian and Arenigian graptolites of the Middle East Baltic area.