[Geysers] Grotto's cone

[Mario Durrant]

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 about Giant's "broken horn" cone?

Mario Durrant

----- Original Message ----- 
From: "jacross" <jacross at lamar.colostate.edu>
To: <geysers at wwc.edu>
Sent: Monday, February 20, 2006 9:59 PM
Subject: [Geysers] Grotto's cone


>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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