K.
L.
Davidek
Duration of the Early Cambrian: U-Pb Ages of Volcanic Ashes from Avalon and Gondwana. Canadian Journal of Earth Science 35, 329-338. doi:10.1139/e97-107
, 1998. U-Pb Zircon Date from Avalonian Cape Breton Island and Geochronologic Calibration of the Early Ordovician. Canadian Journal of Earth Sciences 34, 724-730. doi:10.1139/e17-059
, 1997.