It also is present subsurface in Ohio and the Canadian Providence of Ontario It preserves fossils dating back to the Early Devonian and Late Silurian period.

The name was coined by T.A Conrad, 1839 in the New York State Geological Survey Annual Report.

[1] The upper portion of the Helderberg, or the Kalkberg Formation is host to the Bald Hill ash bed, dated to 417.6 million years ago.

[5] The Manlius is composed of limestone, grainstone, calcareous mudstone and bindstone.

Moving southwest it become more argillaceous and arenaceous, as it grades into the Depue Limestone.