- 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
The abundance of conodonts in the Crug limestone of the Llandeilo district is attributed to a decrease in terrigenous sedimentation during deposition of the limestone. The fauna is represented by more or less fragmentary material and includes new species. Comparisons are drawn with other Welsh contemporaneous conodont faunas, conodont taxonomy is discussed, and systematic descriptions of the Crug limestone fauna are given.