[Rockhounds] strange rock on coast to coast am site

[Mr EMan]

> So far we have fossil cone geyser, coral doughnuts, and pingo. I
> think it's still a mystery. I think I need to google those terms
before I decide.  .

This looks very much like a "sand blow, sand boil, sand geyser, sand
volcano" aka blowout from the New Madrid Zone.  Why it remains pristene
and unleveled is a mystery. This could be a paleo structure or perhaps
it formed in a more recent yet minor seismic event than the 1811-1812. 

See these links.

<http://en.wikipedia.org/wiki/Sand_volcano>
<http://web.utk.edu/~freeland/projects/sb.htm>
<http://www.showme.net/~fkeller/quake/liquefaction.htm>

Can't be a pingo nor can this be coral.

Elton