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Riphean age
abbr.	R (MichaelBurov); Riphean (MichaelBurov); Riphaean (MichaelBurov); the Riphean (MichaelBurov); the Riphaean (MichaelBurov); Riphean era (MichaelBurov); Riphaean era (MichaelBurov); Riphean erathem (MichaelBurov); Riphaean erathem (MichaelBurov); Riphean epoch (MichaelBurov); Riphaean epoch (MichaelBurov); Riphaean age (MichaelBurov); Riphean time (MichaelBurov); Riphaean time (MichaelBurov)