Mollusks

A piece of shelly limestone with a Cardium species

 

On  the shores of the Azov Sea, the most common "stones" are pieces of shells encased in limestone. Above is the photo of one of these things.Close to the sea the process that formed these "things" can ben seen in action:

1.Shells of mollusks, mostly Cardium, are broken during ab and tide. 

2.Next, water washes sand, that covered the shells, into many distinctive layers.

3.Water of the sea presses this construction, and it turns to stone.

 

A shell of Limnocardium partially encased in vivianite(found near city Kerch)

 

Near city Kerch are abundant fossil shells partially encased in a mineral called vivianite. Again, the most common species are Cardium and Limnocardium