The palaeogeographic position of the Lake District in the early Ordovician
- 1 January 1989
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 126 (1) , 9-17
- https://doi.org/10.1017/s0016756800006105
Abstract
The early Ordovician was a time of maximum continental separation and hence a time when faunal evidence can be used to assess palaeogeography in a critical way. We summarize the known trilobite occurrences (18 genera) from the Arenig–Llanvirn of the Lake District, and record some genera for the first time. Maps of the distribution of some of these forms are given. All genera exceptCyclopygewere confined to the Gondwana continent at the time, and some are known from many localities; and two species are widespread in England, Wales, France, Iberia and Bohemia. The fauna is entirely distinct from those of Scandinavia and North America. All the palaeontological evidence points to the Lake District being adjacent to Ordovician Gondwana. In the earlier Ordovician it is not reasonable to suggest that the Iapetus Ocean lay to the south of the Lake District as did Allen (1987).Keywords
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