162 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Many of the pebbles of the conglomerate bear evidence of deforma- 
tion, chiefly in the form of shearing, but actual schistosity has been 
developed in some cases and in others the pebbles are sliced, crushed 
and stretched. On the whole these features may be said to be more 
highly developed in the Norfolk Basin rocks than in the Roxbury Con- 
glomerate, though they are somewhat localized. The sections where 
they are best displayed are at Dedham II, C 4 and Franklin VIII, S 
20, R 21 and M 21 (Plate 7). The sections along the south slope of 
the Blue Hills display some shearing but are relatively free from the 
other features. 
——:—Color. The conglomerates of the Norfolk Basin present 
the same range of colors that are found in the Roxbury Conglomerate 
but in somewhat different order. The prevailing tones are green and 
gray while there is a considerable proportion of purplish tints. Of the 
twenty-one specimens examined seventeen had greenish colors, ten 
gray, six purple, including pink and red, and four drab. 
——:— Bedding. In the hand specimens the arrangement of the 
materials of a rock so coarse as conglomerate is not well shown. In 
the case of four specimens, however, the pebbles were ill sorted and 
huddled together. The description of the larger features of arrange- 
ment and bedding will be given in a later chapter. 
——:— Relations to M elaphyr. "The melaphyrs, which play so im- 
portant a part in the history of the Roxbury Conglomerate, have not 
been definitely recognized in the Norfolk Basin. A few of the pebbles 
found in the conglomerate resemble melaphyr but have not been 
satisfactorily determined. In two localities visited by the writer there 
is igneous impregnation, similar to that which occurs in the conglom- 
erates of Brookline and Newton. Specimens from the south slope 
of Bear Hill (Dedham VII, E 18, Plate 7) show conglomerate impreg- 
nated by igneous rock. In thin section the igneous rock appears as 
irregular tongues of basic glass intruded into the conglomerate. At 
Franklin VIII, 5 20 there is a suggestion of similar phenomena not 
so clearly shown. Thus it seems probable that melaphyr or some 
closely allied rock is represented in the Norfolk Basin. 
Sandstone and Shale. ‘The sandstones as indicated by the seven 
specimens examined consist chiefly of quartz with some felsitic and 
feldspathic material. Gritty and pebbly members are included in 
this group. The pebbles vary in size from a quarter of an inch in 
diameter to two inches and are usually subangular. The fragments 
in the gritty members vary from tiny grains to masses one-quarter 
of an inch in diameter. With the diminution in the number of coarser 
