The Kame-Moraiue at Iioc/tester, X. V. — Fairc/iild. 89 
or less subordinate. The reverse is true of the occurrences 
under consideration. In the Lake Champlain region but one 
dike thatcan with any degree of certaintj^ be called fourchite 
was found. Strangely enough, not a single dike, so far as I 
have examined thera, shows a trace of biotite, which forms 
an additional and essential constituent of the missing mem- 
ber of the monchiquite group. The same is true of the Lake 
Champlain dikes. To such a combination Prof. J. F. Kemp 
has applied the term oKcichitite* 
Other dikes than those mentioned are known in the region 
north and east of the lake. Prof. Kemp reports one from 
Sherbrooke. It therefore seems probable that a careful ex- 
amination of the lakes, streams and elevated areas between 
Magog and the St. Lawrence river may bring to light many 
more of these interesting formations. 
THE KAME-MORAINE AT ROCHESTER, N. Y.f 
By H. L. Fairchild, Rocliester, N. V. 
[Plate III.] 
CONTENTS. Page. 
Introduction 3g 
Location and grouping of the hills 41 
Topography 42 
Structure and composition 42 
Morainic character and relationship 41; 
Conditions of formation 46 
Comparison with neighboring kame areas 48 
Summary 50 
Introduction. 
The city of Rochester is situated upon a plain having an 
average altitude of 500 feet above ocean level. Within a ra- 
*The classification of tliis scries, as arranged b}- H. Roseiibiiscli, and 
presented in tabulated form by Dr. Williams, in his Arkansas Report, 
p. 110, is as follows: 
Monchiquite Group. (Rosenbusch. 1890 . ) 
Containing Olivine. 
Monchicjuite, Rosenbusch, 
1890 
Amphibole monchiquite... . 
Biotite inunchiquite 
Amphibole biotite monchi- 
quite 
Glassy base and minerals 
Augite. 
Amphibole and augite 
Biotite and augite 
Amphibole, biotite and 
augite 
Olivine free. 
f Fourchite, J. F. Williams, 
I iSgo. 
-I Augitite from Sierra de 
I Tingua (in partK Ro- 
l^ senljusch. 
Amphibole fourchite. 
Ouacliitite, Kemp. 1890. 
Amphibole ouachitite. 
fThis paper is an abstract of a longer and more complete description 
of llie "Geology of the Pinnacle Hills," read before the Rochester 
Academy of Sciencr, April 22. ISO.l, which will be i)nblished in the 
Proceedings of that Society, with maps and phott)graphs. 
