“Unfortunately, Merritt Island is built on coquina rock,” Craig Wallace said ... Coquina is a rare limestone made from shell fragments that is common in Florida, virtually indestructible ...

I discovered that the rocks are coquina, a form of limestone ... clams, and other shell-building creatures for this sedimentary rock of calcite. Over time liquefied calcium carbonate glues ...

Hurricanes Ian and Nicole unearthed a somewhat rare marine worm and its coquina-rock surface here ... living in tubes made of sand and shell fragments cemented together and attached to rocks.

Get Photo Samantha Kreisler, the Communications Specialist for the New Jersey Sea Grant Consortium, holds Coquina Clams at Fort Hancock Beach in Sandy Hook while looking for seashells on Wednesday ...

"Florida's Seashells: A Beachcomber's Guide," for instance, covers "263 species of mollusk shells." Variable coquina shells are among the common varieties, Blair Witherington said. They're ...