- 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 petrology and petrogenesis are discussed, and analyses of four rocks of the series are tabulated. Inconclusive evidence is offered suggesting parental rocks of Permo-Carboniferous sediments or pyroclastics, or possibly other rocks. The metamorphism which they underwent is believed to be of Cenomanian (Cretaceous) age.