22 The American Geologist. January, 1901. 
these belts the rock in which the corundum occurred was found 
to be not the alkaH-bearing varieties, the various syenytes, but 
the alkaline-earth rocks, anorthosytes.|| 
From the character of these belts, at their extremities, it 
was believed that they could be traced still farther in an east 
and west direction. 
Late in the autumn of 1899 the writer, while spending a 
few hours in the vicinity of the city of Hull, Quebec, dfscov- 
ered a well-rounded boulder containing grains of nepheline, 
which confirmed his belief that the belt of these rocks con- 
tinued eastward from the province of Ontario across the Ot- 
tawa river into the adjoining province, and early in the present 
year he discovered nepheline syenyte in place about twenty 
miles east of the Ottawa river. 
The rock found here was composed essentially of a whits 
feldspar and nepheline in grains, some of which had a diam- 
eter of two inches, together with a little black mica. The rock 
is similar in character to much of that found in the corundum 
belt of eastern Ontario. Time did not permit of an attempt 
being made to trace out a belt of these rocks to the east of the 
Ottawa river, but from what was seen of the outcrops and 
from his knowledge of the field relations of these rocks in 
Ontario, the writer believes a belt of considerable length exists 
in this part of Quebec. 
A thin section was made of a fragment of the Hull bounlder. 
Under the microscope the rock is seen to be composed of 
ortlioclase, microperthite acidic plagioclase and nepheline, to- 
gether with considerable dark grown mica. The section also 
showed several grains of calcite with somewhat rounded out- 
lines. This occurrence of calcite in the section is an interesting 
feature of the rock, as it was also found to be present in the 
first specimens of the rock examined in Ontario by Dr. F. D. 
Adams, and has since been found in specimens of the rock from 
a number of other localities in the province. The fact has been 
referred to that this carbonate has the appearance of being an 
original constituent.* 
There are several somewhat puzzling features in connec- 
tion with this whole series of nepheline-bearing rocks. Among 
fAm. Geol., November 1899, with map. 
*Am. Jr. Science, July, 1894, p. 14. 
