The Medina Group is a

geologic group Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Eart ...

New York New York most commonly refers to: * New York City, the most populous city in the United States, located in the state of New York * New York (state), a state in the northeastern United States New York may also refer to: Film and television * '' ...

. It preserves

fossils A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in ...

dating back to the

Silurian The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleozo ...

period. The group includes the

Whirlpool Sandstone A whirlpool is a body of rotating water produced by opposing currents or a current running into an obstacle. Small whirlpools form when a bath or a sink is draining. More powerful ones formed in seas or oceans may be called maelstroms ( ). ''Vo ...

Power Glen Shale The Power Glen Shale is a geologic formation in New York. It preserves fossils dating back to the Silurian period. See also * List of fossiliferous stratigraphic units in New York This article contains a list of fossil-bearing stratigraphic u ...

Devils Hole Sandstone A devil is the personification of evil as it is conceived in many and various cultures and religious traditions. Devil or Devils may also refer to: * Satan * Devil in Christianity * Demon * Folk devil Art, entertainment, and media Film and t ...

Grimsby Formation The Grimsby Formation is a geologic formation in New York. It preserves fossils dating back to the Silurian period. See also * List of fossiliferous stratigraphic units in New York This article contains a list of fossil-bearing stratigraphic u ...

Thorold Sandstone Thorold is a city in Ontario, Canada, located on the Niagara Escarpment. It is also the seat of the Regional Municipality of Niagara. The Welland Canal passes through the city, featuring lock 7 and the Twin Flight Locks. History The first su ...

Cambria Shale Cambria is a name for Wales, being the Latinised form of the Welsh name for the country, . The term was not in use during the Roman period (when Wales had not come into existence as a distinct entity). It emerged later, in the medieval period, a ...

and Kodak Sandstone.

References

Geologic groups of New York (state) {{NewYork-geologic-formation-stub