GEOLOGY OF THE WATERLOO QUARTZITE AREA. 
(WITH PLATES VII-IX). 
BY IRA M. BUELL. 
CONTENTS. 
Introduction. ..... 
. 255 
Field Notes. ....... 
258 
General geological relations. 
258 
Description of the exposures. 
. 259 
Structural features. ..... 
263 
Lithological Characters of the Quartzite. 
. 266 
Prevailing characters. .... 
266 
The Portland type. . 
266 
The Hubbleton type .... 
. 267 
The red quartzite. ... . . 
. 268 
The Mud Lake type. .... 
. 269 
The metamorphic conglomerate. 
270 
Comparison with Lake Superior and Other Quartzites. 270 
Summary. ....... 
. 271 
INTRODUCTION. 
The group of quartzite exposures that occurs in the midst 
of the Lower Silurian belt of southeastern Wisconsin, near the 
village of Waterloo, has an immediate local interest as the 
most remote group of outliers of the Lake Superior pre-Cambrian 
area, and as the nearest examples of crystalline rocks to the capi- 
tol of the state. Their peculiar structural types, and relations to 
adjacent paleozoic formations, and especially their relations to 
the quaternary formations, present features of general interest, 
and have caused them to receive considerable attention in geo¬ 
logical literature. The first public mention of this area seems 
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