shown as Middle Cambrian, but post-Mayan intervals are Late Cambrian = Furongian according to Harland et al., and based on correlation of Gradstein et al. with Mindyallan and late Marjumian, which are Late Cambrian according to Harland et al. and Palmer 1998

shown as Middle Cambrian, but Early Cambrian according to Harland et al., and shown by Gradstein et al. as being correlated with the Ordian, late Dyeran, and "Lenan," all of which are conventionally Early and not Middle Cambrian

spelt "Botoman"