Extremely Rare Griffithides corona Russian trilobites

Coming from the Lower Carboniferous (C3 level) deposits of the Wolchow River region near Saint Petersburg, Russia, this is an example a quartet of the EXCEEDINGLY RARE Proetid trilobites Griffithides corona. The trilobites themselves are all enrolled, and are up to 0.9 inches long and 0.5 inches across at the dramatic genal spines (some repair to the delicate spines is evident). Very few of these are ever offered. What is unusual about these trilobites is that they are over 100 million years younger than the Asaphids commonly offered for sale. The Proetida survived up until the Permian extinction which brought down the curtain on 300 million years of trilobite existence, along with the extinction of 90% of ALL species alive at the time. These survivors would definitely not be voted off the island. Whatever else you call this example, it is SUPERB! The cream-colored exoskeletons are well set off by the white limestone matrix which is 4.9 inches by 2.2 inches. As always, the skillful Russian preparators have shown this fine 3-D specimen to best advantage.

Also see: Russian Trilobites Gallery