| A nice and very rare sample from the famous Walcott-Rust Quarry in the state of New York. The lower part of the matrix was taken from the same stone and is reattached on the piece to give it a good scraped matrix. Also the lower ends of the pygidial spines are restored but not colourised for aesthetic aspects. External Link : The Walcott-Rust Quarry  | |||
Location:  | Walcott-Rust Quarry, New York, USA | ||
| Size: | about 13 mm long | ||
| Age: | Upper Ordovician, Ashgill, Trenton Group (about 449 mill. y.o.) | ||