Author K. Davidek E. Landing S. Bowring S. Westrop A. Rushton R. Fortey J. Adrian Davidek, K., Landing, E., Bowring, S., Westrop, S., Rushton, A., Fortey, R., Adrian, J., 1998. New Uppermost Cambrian U-Pb Date from Avalonian Wales and Age of the Cambrian-Ordovician Boundary. Geological Magazine 135, 305-309.
