Full record for megayear n.

Definition a million years
OED requirements any evidence 1935
Earliest cite John W. Campbell, Jr. 'Night'
Comment Mike Christie submitted a 1966 cite from a reprint of Poul Anderson's 1963 "Territory". Ralf Brown submitted a cite from a 1991 reprint of Vernor Vinge's 1986 "Marooned in Realtime"
Last modified 6 July, 2008

Citations for megayear n.

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1935 J. W. Campbell Jr. Night in T. Shippey Oxf. Bk. Sci. Fiction (1992) 111 With what we have learned in the uncounted dusty megayears since, me might have been able to save him.
1963 P. Anderson Territory in Analog Sci. Fact-Sci. Fiction June 64/2 Now humans, the experts tell me, got started way back when, as ground apes that turned carnivore when the forests shrank up in Africa for lots of megayears.
1964 P. Anderson Trader to Stars 98 Now humans, the experts tell me, got started way back when, as ground apes that turned carnivore when the forests shrank up in Africa for lots of megayears.
1986 V. Vinge Marooned in Realtime 19 I was born about ten megayears after the Singularity—the Extinction, Juan calls it.
1994 S.M. Baxter Ring (1996) vi. 80 Sam wants to go to Tau Ceti and build houses under the light of a new sun; the dark possibilities of five megayears hence couldn't be of less interest to him.
1995 D. Brin Brightness Reef (1996) 172 Now let's see if encephalization has changed during the last megayear.