SILURIAN FAUNA INTERPRETED EPICONTINENTALLY 697 
a Wee 
/ \ A/a 
j \ \e 
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y ih 2 
$0 
Lagendd 
=m ei Silurten Areas, | 
— — — JAbhbroximate 
Shore Lines. 
i eee 
Fic. 1. Outline map of North America showing the position of Silurian outcrops 
and the hypothetical shore line of the Silurian epicontinental sea. The dark areas 
represent the Silurian outcrops, except in such instances as are specifically explained 
in the text, 
