This picture is of a Halysites catenularia (Linnaeus, 1767) chain coral fossil. It existed during the Silurian period. The fossil was found ...

This image is of a  Halysites catenulatus  coral fossil. The animal existed in the Silurian Period. Fossil was discovered in Dudley, Scot...

The index fossil of the Silurian period: Halysites . These coral fragments were found in the Louisville limestone in Jefferson County, Kent...

Here is a Silurian index fossil called Halysites or chain coral. It is part of the hands on exhibit in the Discovery Gallery at the Louisv...

Chain coral Halysites from the Silurian Period. This one was found in central Jefferson County in the state of Kentucky in the United State...

Here is a another Halysites segment from the Silurian Period. The chain appearance is much more apparent in this specimen. It could use som...

Here is a piece of Louisville Limestone that I think has Halysites in it. It was found in Jefferson County, Kentucky. Fossil from the Sil...

A Halysites chain coral protruding from a rock from Louisville Limestone member. It was found in Jefferson County, Kentucky.

Louisville is in an ice storm right now and this Halysite coral got caught in it. It is now encased in ice. It is from the Silurian Period ...

Here is a chain coral from the Silurian Period called Halysites . It appears to be about 8 cm long. It was found in northern Nashville, Ten...

Here is a piece of halysite or chain coral from the Silurian period. I saw this it the last KYANA fossil study group.

Here is a piece of chain coral or Halysites seen at the last KYANA fossil study. It was probably from a field trip taken to a Sellersburg,...

Here are some new halysite pieces I found that the Louisville area cemetery the cephalopod was found at. This points to a set of Silurian fo...

Here is a coral called Halycites that existed in the Silurian period. My cousin gave me this piece and I think it came from somewhere in C...