However, these simple mollusks may hold decades of data detailing the historic conditions of Northwest waterways, such as the Little Spokane or Snake rivers, embedded in their shells. Earlier this ...

Most marine animals form their shells from calcium carbonate, which is a tough mineral also found in limestone. Some sponges and microorganisms use another compound silica. There is also a group of ...

Seashells tend to appear quietly. After the tide pulls back, they are just there, mixed into the sand, sometimes whole, ...