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26 HISTORY OF ERIE COUNTY
HAMILTON GROUP
At Prout's Station and Deep Cut, on the Sandusky, Mansfield &
NeAvark Railroad, the base of the Huron shale is exposed, and beneath
it are seen layers of light, cherty, and bluish, marly limestone, which are
the representatives of the Hamilton group of New York. Here the
formation has become significant in dimensions, compared with what it
is further east; Avhere it is not more than tAventy feet in thickness, while
in Central NeAV York the Hamilton, group is 1,200 feet thick. There is
no mistaking the equivalence of these strata, hoAvever, for they are full of
fossils. At Prout's Station the folloAving species are found, viz.:
Spirifera mucronata, Cyrtia Hamiltonensis, Straphodonta Ilalli,
Phacops bufo, etc., the most