Pyrite Replaced Brachiopod (Paraspirifer) Fossils on Shale - Ohio

 
 
 
These are three brachiopod fossils of the species Paraspirifer bownockeri that have been replaced by glittering pyrite. It comes from the Devonian aged Silica Shale near Sylvania, Ohio. The brachiopods were prepped free of the surrounding rock, cleaned and then remounted back to the shale. There is a repaired crack through one of the brachiopods where the rock was split through it. The quarries where these brachiopods used to be found are now closed to collectors so they are much harder to acquire.

There is an additional fossil near one edge of this specimen. It is a partial trilobite head of the genus Eldredgeops. You can really feel the heft of the iron pyrite in this specimen when you hold it in your hand.

Comes with an acrylic display stand.

Brachiopods are members of the phylum Brachiopoda. They are clam-like with wide shells composed of two halves called valves. They are filter feeders that live a-fixed to rocks or on the seafloor. Brachiopods first appear in early Cambrian. These were simple forms with non-articulating shells. Their diversity peaked during the Devonian and there are currently 12,000 described fossil species of Brachiopoda from 5,000 genera. Most species of brachiopod died out during the Permian-Triassic Extinction but there are about 450 species living today. They live in cold, marine environments, like polar seas or the continental shelf and slope. The largest fossil Brachiopod is 7.9 inches (200 mm). Most are 2-4 inches (3-8 cm). Living Brachiopods also fall into this range.

Brachiopods are more closely related to Bryozoans than Mollusks. The easiest differences to identify are in the shells of clams and Brachiopods. Mollusk shells are divided into left and right while Brachiopod shells are divided top (dorsal) and bottom (ventral). The shells of mollusks are usually equal on the right and left. In Brachiopods, the bottom shell is larger than the top. The other big difference is in how they feed. Both are filter feeders but mollusks extend their filter into the water and pull food into its shell. Brachiopods have internal feeding structures. Water is drawn into the shell where the food is filtered out before expelling it out.
DETAILS
SPECIES
Paraspirifer bownockeri
LOCATION
Sylvania, Ohio
FORMATION
Silica Shale
SIZE
2" largest brachiopod on 5.2 x 4.7" shale
CATEGORY
ITEM
#136660
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