146 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Locality 2. Milton Upper Mills. At Milton Upper Mills, about 
one tenth of a mile east of Blue Hill Avenue on Eliot Street, 200 feet 
from the road on the left, in woods, there may be seen an outcrop 
which has many of the characteristics of tillite. The strike and dip 
were not obtainable. There are about fifty feet exposed. The 
matrix is gritty argillite. Pebbles are angular, subangular, and 
rounded. ‘There is no stratification seen. 
Criteria found.— A, B, C, D, F, J, L. 
Locality 3. Roslindale. In Roslindale, south of the Arnold Arbore- 
tum, fifty feet east of the junction of Weld and Centre Streets, there is 
an old quarry in the tillite. No strike or dip can be found near the 
tillite. The thickness is problematical on account of the heavy cover- 
ing of Pleistocene drift. About 200 feet are exposed in a north-south 
direction. The matrix is argillaceous as at Hyde Park. Boulders 
up to two feet are common. The pebbles are angular, subangular, 
and rounded. Blunted pebbles with concave fractures are common, 
and also bevelled pebbles. I believe this outcrop to be near the 
bottom of the tillite as at Hyde Park. I have found one pebble with 
very faint striae, well bevelled and blunted. There are no signs of 
stratification in this bed. Shearing has been intense. 
Criteria found: — A, B, C, D, F, G, H, J, K, L, M. 
Locality 4. Roslindale. Another exposure in Roslindale may be 
seen south of the above. Strike and dip not observed. About 
twenty feet only are exposed, in a north-south direction. The matrix 
here is arenaceous. Pebbles and boulders up to a foot in diameter 
may be found, of angular, subangular, and rounded shapes. No new 
kinds of rocks have appeared. I have found no shale or slate frag- 
ments. A striated quartzite pebble was obtained haying three striae. 
Two of these are parallel, and a third makes an angle of 11° with the 
others. This pebble is angular with blunted ends and a concave 
fracture. Cleavage well developed at this locality: 
Criteria found: — A, B, C, D, E, F, J, L. 
Locality 5. South of Forest Hills Cemetery. About 600 yards 
southwest of the Forest Hills Cemetery locality, and 100 yards east 
of the trolley line, there is a fair exposure of the tillite. The strike 
and dip were not obtainable. The thickness is also unknown. On 
the strike of the Cemetery exposure given below, there are 150 feet 
visible. The matrix is gritty argillite. The pebbles, boulderets, and 
boulders are angular, subangular, and rounded, consisting of granite, 
felsite, quartzite, melaphyre. I have not seen any shale or slate 
fragments. No striated pebbles have yet been found. There are no 
