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Geological Synopsis of Collection

Geological divisions represented in the Collection arranged according to Danas Manual of Geology

... I Archaean Time

Laurentian Period

Huronian Period

represented by crystalline & metamorphic & other rocks

... II Palaeozoic Time

I Silurian Age

... a lower Silurian

Primordial or Cambrian Period

Potsdam & Canadian Epoch

Trenton Epoch

Utica & Cincinnati Epochs or Hudson river Group

... b upper Silurian [--Epoch--]

Medina Epoch

Clinton "

Niagara "

lower Helderberg Ep.

Oriskany Ep.

European Silurian

represented by 800 species & varieties

... Devonian Age

Corniferous Period

Hamilton "

Chemung "

European Devonian

about 250 [insert: - 300] species & varieties

... Carboniferous Age

[dub?sub?]carboniferous Period

Kinderhook, Burlington, Waverley, Keokuk, St Louis Chester, European

... Carboniferous Period

Millstone grit

Coal measures

... Permian Period