Check the listing for details. EXTINCTIONS- EXTREMELY RARE DETAILED SILURIAN ARMORED WORM MACARIDIAN- NEW YORK!. Listed at 299.99 USD. Name: Macaridian (Armored Worm) Age: Middle Silurian Formation: Rochester Shale Location: Middleport, New York Size: Worm is 0.5 inches long! This is an extremely rare invertebrate fossil. This is a fabulous specimen of a Macaridian (Armored Worm) from the Silurian of New York. This armor-plated worm is one of the rarest fossils to be found in the Rochester Shale. This top quality specimen is one of the nicest that we have ever seen - the individual plates are very well defined. The distinct worm is preserved in a 3-dimensional manner and is almost perfectly centered on the large, natural plate of shale that also contains remains of several brachiopods. This is a very collectible specimen of this highly unusual fossil worm from the Arctinurus site. A Certificate of Authenticity from EXTINCTIONS.com is included with this item. Insurance is included in the cost of shipping. Note: International customers may have to pay a duty at Customs - every country's rules are different.