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Maritime Sediments, Vol.
10, No.2 (1974), 52-66
DELTAIC AND SHALLOW MARINE
LOWER SILURIAN SEDIMENTS OF THE NIAGARA ESCARPMENT BETWEEN
HAMILTON, ONT. AND
ROCHESTER, N.Y. -- A FIELD GUIDE
PETER MARTINI
Department of Land Resource
Science, University of Guelph, Guelph, Ontario
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INTRODUCTION
 The emphasis of this paper
in on the Medina Formation which is a Lower and Middle Silurian Units that
outcrops along the Niagara Escarpment between Hamilton, Ontario, and Fulton, New
York (AL, Fig. 2). The Medina Formation consists of five Members (Fig. 1) as
follows: (1) Thorold, (2) Grimsby, (3) Cabot Head, (4) Manitoulin, and (5)
Whirlpool. The upper Member is the Thorold. It is 1 to 14 feet thick and is
composed predominantly of light gray, fine-grained, quartzose sandstone and
shale. The Grimsby Member is 5 to 74 feet thick, and is composed of red with
gray mottling, fine- to medium-grained, quartzose sandstone, and red--gray
mottled shale. The Cabot Head is a sequence 0 to 50 feet thick made up of gray,
fossiliferous shale with minor thin siltstone and silty limestone interbeds. The
Cabot Head has been called Power Glen at DeCew Falls, Ontario (Bolton, 1957).
The Manitoulin, in the Hamilton-Niagara area reaches 12 feet in thickness and
consists of argillaceous dolostone to medium gray, crystalline, bioclastic
dolomitic limestone. The Whirlpool is the lower member. In the Hamilton-Medina
area it is up to 20 feet thick. This member is a light gray, fine- to
medium-grained, cross-bedded quartz sandstone.
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