Thorold Formation

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Thorold Formation
Stratigraphic range: Silurian
Type Formation
Location
RegionFlag of New York.svg  New York
CountryFlag of the United States.svg  United States

The Thorold Formation is a geologic formation in New York. It preserves fossils dating back to the Silurian period.

New York (state) American state

New York is a state in the Northeastern United States. New York was one of the original thirteen colonies that formed the United States. With an estimated 19.54 million residents in 2018, it is the fourth most populous state. In order to distinguish the state from the city with the same name, it is sometimes referred to as New York State.

The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago (Mya), to the beginning of the Devonian Period, 419.2 Mya. The Silurian is the shortest period of the Paleozoic Era. As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by several million years. The base of the Silurian is set at a series of major Ordovician–Silurian extinction events when up to 60% of marine genera were wiped out.

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