1906] REPORT OF THE GEOLOGICAL BRANCH. 21a 
preserved as casts in relief, giving the reverse of the trail as 
originally formed upon the surface of the soft mud of the sea. 
It appears that the softer and finer materials of the stratum 
on which the trail was criginally made has disappeared and been 
for the most part washed away and denuded whilst the harder 
stratum of which the overlying bed consists (made up of coarser 
materials than the track or trail bed proper) remains to tell 
the story. There are several distinct forms found upon the under- 
side of the overlying stratum from that on which the track was 
made. Some are narrow, others are wide, some simple, others 
are ornamented and some are very tortuous, while others are less 
tortuous and evidently made by larger and less mobile creatures. 
These tracks and trails, so far as they afford paleontological evi- 
dence of the life which existed curing the period when the Chazy 
rocks were being laid down, may be referred to several genera, 
such as paleontologists have described and include under such im- 
pressions on the rock-formations. The Rockcliff trails and tracks 
appear t« have been made for the most part by worms such as 
are known to have existed during Odovician times. A more de- 
tailed study and report on these will form an interesting paper for 
THe Ottawa NATURALIST, when it is hoped that photographs or 
reproductions illustrating these forms will be forthcoming, with- 
out which no wrltten description should be published. On sev- 
eral occasions members of the Club have visited Rockcliff during 
the past summer season and numerous slabs exhibiting these trails 
and tracks have been collected. 
TEACHERS’ ASSOCIATION—SUMMER SCHOOL. 
During the Summer School of Science under the auspices of 
the Teachers’ Association, Principal White called upon one of the 
Leaders of the Club to address the teachers assembled during 
their outings, and it was with pleasure that he acceded to his 
request. Four talks were given and a number of specimens 
examined aud described on the spot. The shores of the Ottawa 
and some of the railroad cuttings along the C. P. R. west of Hull 
and above the Chaudiére Falls gave abundance of fine material 
for examination and study. Not only did the more ancient rock - 
formations come in fora share of examination, but also the later 
deposits forming the ancient river channels and part of the old 
