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 We use the Russian-Kazakhian stages until the ICS gets around to finally giving these Early Cambrian ages some names. As of this date (041118), the ICS Early Cambrian Epoch is undivided.
 We use chaotic in its mathematical sense, meaning that the end state of a closed system is extremely sensitive to initial conditions. The classical example is from meteorology, in which the occurrence of a hurricane is supposedly determined by the wing beat of a butterfly six months earlier and ten thousand miles away.
 These peculiar names are English corruptions of French corruptions of Micmac (Amerind) place names. Escuminac and Miguasha actually have very pedestrian meanings: "Lookout Point" and "Red Cliff," respectively, thus proving that the original inhabitants were just as unimaginative as the French and Tory settlers who replaced them.