<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=US-ASCII" http-equiv=Content-Type> <META name=GENERATOR content="MSHTML 9.00.8112.16476"></HEAD> <BODY style="FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" id=role_body bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document color=#000000 size=2 face=Arial> <DIV>Let it be noted that Old Faithful belongs on the list of geysers with known dormancies -- at least one. The description by Ferris in the 1830s describes several geysers but notably nothing that could be Old Faithful. And in fact, although there were rather few visitors to the Upper Basin during the mid-1800s, there were some, and there is NO description of an Old Faithful eruption until 1864. Not to mention the silicified wood within the cone formation, and other such proofs of inactivity.</DIV> <DIV> </DIV> <DIV>Scott Bryan</DIV> <DIV> </DIV> <DIV> <DIV>In a message dated 4/26/2013 5:34:23 P.M. US Mountain Standard Time, lstephens2006@hotmail.com writes:</DIV> <BLOCKQUOTE style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=3 face=Calibri>Someone posted on the old faithful webcam chat page:<BR> <BR>"Lynn's recent listserv discussion on Giantess intervals has lead me into thinking of geysers in terms of decades and centuries.  Most of the big geysers have extended dormancies.  And I started wondering what geysers we might be taking for granted today."<BR> <BR>Short answer:  The only "major" geysers that don't seem to have periods of dormancy are Great Fountain, Old Faithful, and Riverside.  Even some of the medium size geysers have had years of dormancy.<BR> </FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>