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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

image_08.jpg (893030 ืึฝฺ)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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