Definition of Arenigian. Meaning of Arenigian. Synonyms of Arenigian

- In geology, the Arenig (or Arenigian) is a time interval during the Ordovician period and also the suite of rocks which were deposited during this interval...
- record the appearance of mineralized skeletons in this phylum. By the Arenigian stage of the Early Ordovician period, about 480 million years ago, all...
- quartzose sandstones known as the Stiperstones Quartzite Formation. This Arenigian age rock unit which dips steeply to the WNW is between 120 and 325m thick...
- with forms like Ancistroceras. Their diversity increased after the late Arenigian extinction (Floian-Dapingian) at the end of the Canadian Epoch and take...
- American C****inian and Ibexian stages and by the Canadian Series and ICS Arenigian, overlaps with the slightly younger and newer ICS Darriwilian and is followed...
- Trilobite fossils are common in the shale. The Barrios Formation is Arenigian and up to 500 metres (1,600 ft) thick. It consists of a white m****ive...
- impoverished fauna dates back well into the second stage of the Ordovician (Arenigian). The youngest fauna consists already of 15 different taxa and belongs...
- 1962. Its age, as given in the Treatise on Invertebrate Paleontology is Arenigian. Bajkaloceras is characterized by an orthonic s**** with an elliptical...
- Holmiceras is one of two ancestral lituitids from the late Early Ordovician (Arenigian). The other being Ancistroceras. Holmiceras begins with about 1.5 to 2...
- cephalopod evolution In worldwide terms the C****inian is upper, or late Arenigian which is exactly equivalent to the newly proposed Floian, both spanning...