Wednesday, February 08, 2006
This stone is a cut block of Coquina. It is a natural sedimentary rock that forms along the east coast of Florida. We are rock-challenged in Florida. There's sand everywhere, but real rocks are mostly limited to chalky limestone of various grades and this unique shellstone.
Coquina forms in the general sedimentary way, layers of sediments deposited atop each other and eventually being squeezed into a rock. (Remember 8th grade Earth Science?)
In the case of coquina, you have the additional "glue" of the lime from the seashells leaching out and naturally cementing the shell fragments together. Most of the shells in coquina rock are the remains of the coquina clam ...genus Donax. There are huge deposits of coquina along the coast and in a few places, the surf has exposed the rock to provide us with a truly rare event in Florida...a natural rocky beach.
Posted by R.Powers at 6:26 AM