SAYLES: THE SQUANTUM TILLITE. 147 



signs of stratification, and no visible contacts with underlying or 

 overlying beds. Cleavage is well developed. 



Criteria found: — A, B, C, D, J, L. 



Locality 6. Forest Hills Cemetery. In the Forest Hills Cemetery 

 there is a small outcrop of tillite. This rock may be found about 100 

 feet from the fence north of Walkhill St., opposite the crematorium. 

 Here the strike at the contact with slate is N 72° E, and the dip 70° S. 

 It is not possible to obtain the thickness. About twenty-five feet are 

 exposed. Measuring toward the west there is a distance of 335 feet 

 to an outcrop of sandstone, and the latter is exposed twenty-five feet. 

 The sandstone is in contact with the main body of the Roxbury con- 

 glomerate. The characters of the tillite are much like those at Squan- 

 tum Head, to be described later. Thin layers of shale or slate may be 

 seen in the tillite a few feet from the slate contact. The matrix is 

 arenaceous; the pebbles of all shapes, angular, subangular, and 

 rounded. The materials of the pebbles are the same as at all the 

 exposures with no additional varieties yet found. The largest frag- 

 ment found was about one foot in diameter. Several shale or slate 

 fragments were found mixed with the pebbles. There are no transi- 

 tion-beds to the Cambridge slate, and in this the deposit resembles 

 that at Squantum Head. Cleavage is well developed. Xo striated 

 pebbles were found. 



Criteria found: — A, B, C, D, J, L, M, O. 



Locality 7. New Calgary Cemetery. At New Calgary Cemetery, 

 one fifth of a mile south of Walkhill St., close to the fence on the east, 

 a small outcrop of what appears to be tillite may be seen. The strike 

 of the beds just south is E 6° S, and the dip 76° W. The thickness 

 here is not obtainable. The matrix is a gritty argillite. No stratifi- 

 cation is visible. The pebbles have angular, subangular, and rounded 

 shapes. The position of this bed is right for tillite, the transition- 

 beds coming to the south, and south of these the main body of the 

 Roxbury conglomerate, while to the north comes thick slate. Very 

 little more can be said of this outcrop except that the pebbles so far as 

 visil)le are of granite, and felsite. 



Criteria found : — A, B, C, D, J. 



Locality 8. Morton Street. About fifty feet south of Canterbury 

 Street on Morton Street there is an outcrop which resembles very 

 closely the tillite at the junction of Blue Hill Avenue and Harvard 

 Street. No strike or dip have been obtainable. The matrix is arena- 

 ceous. Pebbles are angular, subangular, and rounded. Cleavage 

 noted. 



