S A TLBS. — The Squantum Tillite. 



PLATE 11. 



EBBLE FROM TILLITE AND PEBBLE PBOM TILL. 



On the left is a quartzite pebble from the tillite at Franklin Park, showing one 

 blunted end, concave fractures, striae, and ice shaping. On the lower surface 

 there are a number of striae running in different directions. This pebble has 

 been slightly squeezed at the pointed end; the contact of the matrix with the 

 pebble may be seen on the lower surface. A small piece of matrix adheres to 

 the pebble on the upper left hand side. 



The pebble on the right is the t>T)e found very commonly in till. This one 

 was found at Mystic in the Pleistocene till of a drumlin. In general char- 

 acters it is very much like the pebble from Franklin Park. 



