Gravicalymene
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Gravicalymene is a genus of trilobites from the order Phacopida, suborder Calymenia. Gravicalymene has been a 'hot button' trilobite lately. The species that are currently in this genus have been in Calymene and Sthenocalymene. One thing that seems to be consistent with the genus Gravicalymene is that they sometimes occur in Dolomitic limestone and that many occur in the Silurian age.
There is an Ordovician species, Gravicalymene magnotuberculata. This species occurs within the Trenton Group of New York State. Large numbers of molts as well as some complete specimens are known to occur in thin Cryptolithine-dominated gray shale horizons of the Sugar River Formation (a Trenton Group member).
Some Known Species and Locations.
- Gravicalymene arcuata, around Wales Great Britain.
- Gravicalymene celebra, throughout Mid-west United States.
- Gravicalymene magnotuberculata, localized bedding planes, New York State, United States.
