I don't think we'll ever really know the answer to this. It is clear that the "original" Imperial is the big pool and not the thing that now erupts. Marler discusses the renewed activity of 1966 but is not clear about exactly what he was seeing -- was it the original Imperial or today's feature? I think the latter but do not _know_. If anybody has the answer, I'd love to hear it. Scott Bryan In a message dated 9/18/2012 5:31:35 P.M. US Mountain Standard Time, caros at xmission.com writes: But seriously, has activity except for 1928-9 technically been a vent *in* Imperial's pool and not Imperial itself? -------------- next part -------------- An HTML attachment was scrubbed... URL: </geyser-list/attachments/20120919/067489d0/attachment-0001.html>