Landing, E., Westrop, S.R., Bowring, S.A., 2013. Reconstructing the Avalonia Palaeocontinent in the Cambrian: A 519 Ma Caliche in South Wales and Transcontinental Middle Terreneuvian Sandstones. Geology Magazine 150, 1022-1046. doi:10.1017/S0016756813000228

Isachsen, C.E., Bowring, S.A., Landing, E., Samson, S.D., 1994. New Constraint on the Division of Cambrian Time. Geology 22, 496-498. doi:10.1130/0091-7613(1994)?022<0496:NCOTDO>?2.3.CO;2