146 BULLETESr: 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 H^^le 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. 



Localiiy Jf-. Roslindale. Another exposuce 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. Xo new 

 kinds of rocks have appeared. I have found no shale or slate frag- 

 ments. A striated quartzite pebble was obtained having 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. Xo striated pebbles have yet been found. There are no 



