[Geysers] Grotto's cone

[Karen Webb]

I thought I'd read that the vent broke out in a stand of trees and that 
it's the *stand* of trees that accounts for the shape rather than an 
isolated tree amidships.  Of course, we've always thought the name 
"groin geyser" had a lot to commend it...
Karen

jacross wrote:

>I was looking at a photograph of Grotto's cone today, and it occurred to me 
>that Grotto is about the only geyser I can think of where the main mass of the 
>cone is penetrated by large hollow spaces.  The inner parts of the cone seem 
>to have eroded out at some point, possibly following a long dormancy.  Rocket 
>has a few thinner arches.  Also, Grotto's cone is really a half-cone, or a 
>2/3s cone--it doesn't completely encircle the vent.  The only other cone I can 
>think of where this kind of thing is happening is Union, where the large 
>(unnaturally caused) hole on the east side is expanding slowly, eroding softer 
>material out from under a harder shell.
>
>How could this happen?  A long dormancy in Grotto's past?  Perhaps that's when 
>the tree grew in front of the vent?
>
>Jeff Cross
>jacross at lamar.colostate.edu
>
>
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