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North Wales Rawtheyan Assemblage 4D, Rhwlas Limestone, England (Ordovician of the United Kingdom)

Where: England, United Kingdom (53.0° N, 3.0° W: paleocoordinates 45.7° S, 16.9° W)

• local area-level geographic resolution

When: Rhwlas Limestone Formation, Rawtheyan (455.8 - 445.6 Ma)

• Base of Moelfryn Mudstone, in Upper Bala Group

• formation-level stratigraphic resolution

Environment/lithology: offshore; lithified, gray, argillaceous limestone

• Fine-grained, pale grey, muddy bioclastic limestone

Primary reference: D. A. Bassett, H. B. Whittington, and A. Williams. 1966. The Stratigraphy of the Bala District, Merionethshire, (with discussion). Quarterly Journal of the Geological Society of London 122(3) [A. Miller/P. Novack-Gottshall] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 3675: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 06.08.1999