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The Ordovician meteor event is a proposed shower of L chondrite meteors that occurred during the Middle Ordovician period, roughly 470 million years ago.
This line is found in the Middle Ordovician Asery Level deposits of the Volkhov River region near Saint Petersburg, Russia.
The fossils of this species are found only in the middle Ordovician deposits of the Volkhov River region near Saint Petersburg, Russia.
Intejocerida is the name given to a group of generally straight shelled nautiloid cephalopods originally found in Lower and Middle Ordovician sediments in the Angara River basin in Russia; defined in the Treatise as an order, and combined there with the Endocerida in the Endoceratoidea.
Litoceras is a trocholitid (Tarphycerida) genus that has been found in the Lower and Middle Ordovician of Newfoundland.