Cite
 

Meaning of penecontemporaneous

pe•ne•con•tem•po•ra•ne•ous

Pronunciation: (pē"nē-kun-tem"pu-rā'nē-us), [key]
— adj. Geol.
  1. formed during or shortly after the formation of the containing rock stratum: penecontemporaneous minerals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.