Glyptambon Trilobite

Trilobite cephalon found in the Waldron Shale.  Middle Silurian Period was the age this creature lived.   It appears to be a Glyptambon verrucosus? Fossil found in Clark County, Indiana.  Fossil is somewhat small with cephalon being approximately 1.75 cm wide.

See Weeks Trilobites web site for a truly stunning specimen of this species of trilobite!

The Trilobite Spiral

The Smithsonian Museum of Natural History of Washington D.C. has an extensive collection of Ohio trilobites on display.  It consists of three spirals that show the grow sizes of three common trilobites: Isotelus (Ordovician), Flexicalymene (Ordovician), and Phacops (Devonian).  They appear to be from Ohio and presented in an enrolled state.

Paradichocrinus planus Crinoid

Paradichocrinus planus crinoid calyx found in Indiana.  It existed in the early Carboniferous Period (345-325 million years ago).  Picture taken August 2010 at Smithsonian Museum of Natural History, Washington, D.C.