- 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
Volcanic lapelli, bomb-like fragments and dust, along with other ejectamenta were incorporated in the limestone during its sedimentation. The limestone belongs to the Chail series of Algonkian age. The volcanic explosion took place under sub-marine conditions.