Ludlowville Formation

The Ludlowville Formation is a geologic formation in New York, Ohio and Pennsylvania. It dates to the Devonian period.

Owasco
The Owasco is a thin distinct silty unit. It has sharp distinct boundaries at its top and base. It is flaggy, locally fossiliferous and is displays cross bedding in some locations. The upper contact maybe a diastem, rather than an erosional disconformity. This unit is fairly thin only 1-2' thick in outcrops. It thickens westward.

Fossils
The brachiopod AIlanella tullius is one of the fossils the Owasco is noted for.

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

The basial Jaycox contains the Hills Gulch bed, a fossiliferous bed with corals and shells, as well as megaburrows at its basial contact. The Hills Gulch is a calcareous siltstone.

Centerfield Limestone
The Centerfield Limestone is a geologic formation in New York, and Pennsylvania. It dates back to the Devonian period. It is the lowest member of the Ludlowville Formation and it overlies the Skaneateles Formation. The Peppermill Gulf bed is included within the Centerfield Lime. The unit was named by Smith (1930)

Fossils
This Limestone unit contains fossils of crinoids, rugosa, bivalvia, trilobites and brachiopods. This unit also contains several corals including; Eridophyllum and Heliophyllum hali.