Review of Recent Geological Literature. 269 
erected into a new group—the Pyroxenites, a name given by the 
late Dr. Sterry Hunt to certain non-feldspathic rocks differing 
in origin but having a pyroxene as the principal constituent. 
5. Several gaps in former tables have been filledin with recent 
discoveries, such as Malchite, a dioritic rock corresponding to 
Aplite; lolite, corresponding to Nepheline Basalt, but contain- 
ing garnet; Fourchite and Monchiquite Lamprophyric dyke 
rocks of the Theralite series. 
Little stress is laid on the division of the Volcanic rocks into older 
and newer, but it is still retained. In the subordinate classification 
many names, based merely on structural differences in the rocks, have 
been omitted, ¢. g., Nevadite, granophyric, etc. The typographical 
features of the table are excellent, the relative importance of the various 
divisions being clearly brought out by the use of several kinds of type. 
Important rocks are indicated by heavy-faced type, and when a rock is 
a mere variety of the preceding one, the type is shifted to call attention 
to the fact. 
The author draws attention to the fact that although Rosenbusch’s 
group of the Dyke Rocks has called forth much adverse criticism, yet 
this group has certain claims for recognition, and itis therefore retained, 
the three series of “granitic,” “granitic-Porphyritic,”’ and “Lampro- 
phyritic” Dyke rocks, into which it is divided, being separated in the 
table by spacing, not by lines. 
In conclusion, the author acknowledges valuable help and suggestions 
received from Profs. Rosenbusch, Geo. H. Williams, and the late Dr. J. 
Francis Williams. 
Report on the Sudbury Mining District, Canada. By Dr. Roprert BELL, 
Assistant Director, Geological Survey. This report is the result of three 
years work by Dr. Bell, assisted by Mr. A. E. Barlow and others. It is 
accompanied by a fine map, geologically colored, covering an area of 
72 by 48 miles, equal in extent to about four counties. In doing this 
geological work Dr. Bell and his assistants had not the advantage of a 
settled or surveyed region, but were obliged to do a large proportion of _ 
the topographical work as well, and to contend against the disadvantages 
of a difficult forest country. The map was compiled under the super- 
vision of Mr. Scott Barlow, chief topographer, and is very finely exe- 
cuted. 
The narrowest part of the great Huronian belt comes within this 
sheet, and is flanked on the southeast by true Laurentian gneiss, but on 
the northwest side this belt is bounded by a mixture of similar gneiss 
with great areas of granites and syenites. The Huronian rocks which 
are fully described, consist largely of graywackes, with and without 
included fragments and pebbles, and are generally heavily bedded, but 
frequently coarsely slaty. These merge into quartzites, which are also 
largely developed and associated with elongated masses of greenstones 
and thick belts of clay-slate. The series is shown to be largely of vol- 
canic or pyroclastic origin. 
In addition to the undoubted Huronian, there is within this district a 
