Buz's seashell claim

I know that El Capitan, the highest peak in Texas, has as its top 1600 feet a reef of primarily calcareous sponges, largely in the positions in which they grew. There's a lot of broken shell bits throughout, too, as one would expect for a reef growing close to the surface where there's wave action. I'd have to go find the monograph I read all that in to get any details, though.

Some online refs for the Capitan Reef:
http://www.geocities.com/earthhistory/roth.htm
http://www.geocities.com/earthhistory/reef.htmThe rest of that site is excellent as well - the author is pretty amazing in the depth and breadth of his research into some pretty heavy geology, considering he's just an amateur at it all.
Read them over, Buz and Wiz, and tell me what you think.