212 THe Ottawa NATURALIST. [ February 
were subjected to pressures subsequent to their crystallization. 
The cracks and V-shaped breaks evident along the outer and con- 
vex curves of the crystals favor this view. Microscopical investi- 
gation would no doubt reveal the true nature of the origin of such 
features, whether they are constructive forms or forms of destruc- 
tion. The Leaders of the Club merely wish to point out the oc- 
currence of these curved crystals and urge upon the mineralogist 
or the student of geo-physics to study the phenomena observed at 
this locality. Biotite crystals also occur in the vein at Carp. 
THe CHazy AT ROCKCLIFF. 
Close to the water’s edge and along the base of the cliff front- 
ing the Ottawa river at the Rockcliff terminus of the Ottawa 
Electric Railway, as well as below the Manor House or residence 
of Mr. T. C. Keefer, F.R.S.C., the Chazy formation is well 
developed. Its strata, as exhibited in the lower portion of 
the bluff, consist of comparatively coarse materials, more or less 
rounded grains of quartz cemented by a ferruginous paste or 
matrix of impurities in which clay, lime and magnesia appear to 
be the chief ingredients. Numerous fragments of Limgule occur 
in the coarser sandstone beds, and those best preserved appear to 
represent the species described by Mr. E. Billings as Leugula 
Lyelli, trom the upper Ottawa extension of the Chazy near Pem- 
broke, Ontario, about 100 miles from the City of Ottawa. These 
Lingule are associated with numerous minute irregularly rounded 
black grains resembling those ‘‘ phosphatic nodules” described by 
T. Sterry Hunt from the Chazy of different portions of Canada. 
At Hog’s Back, near the Central Experimental Farm, where the 
Chazy formation is also developed and may be studied to advant- 
age, the Lingule found there, namely: Zinguwla Bellz, Billings, 
and Lingula Huronensis, Billings, are likewise associated with 
phosphatic nodules, or concretions which are held to be of organic 
origin. ; 
Besides these remains of Zzmgu/a and the phosphatic nodules, 
the Rockcliff strata have yielded during the past year an excellent 
series of slabs exhibiting interesting tracks and trails of marine 
organisms made upon the layers of the sea-mud of the ancient 
shore deposit or shallow water as they journeyed from place to 
place in search of tood, etc. These trails are for the most part 
