- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
Points out that definitive Tournaisian (lower Carboniferous) species are present in the Solenopora subzone at Ravenstonedale, Westmorland, northwest England, and that not only this bed but the Pinskey Gill beds below are Tournaisian, rather than Visean as stated by T. N. George . Beds correlated with the Ravenstonedale series therefore are Tournaisian. Definitive Tournaisian species are also present in the Dublin region, Ireland.