over the New Haven Region. 351 
west are very numerous over Orange and Woodbridge.*. It is 
not necessary to multiply facts of this kind; for itis a matter 
of common observation over New England that the chief part 
of the drift came from the northwestward. 
¢. Bowlders within the area of the wide Connecticut valley prove 
that the southeastward movement or ice-stream extended over the 
valley. Those of the unmistakable porphyritic gneiss of the 
Naugatuck valley, which are scattered so widely over Wood- 
bridge and Orange, oecur also in the New Haven region ; and 
one, now three miles east of the western limit of the region is 
‘over 20 cubic feet in size. Masses of ordinary gneiss, from the 
eastward. Quartzyte bowlders, derived, in all probability, 
from the Canaan or Berkshire region, are tnore numerous than 
those of gneiss, evidently because of their greater durability ; 
they are scattered widely, and I have found some, probably 
os the same source, 15 miles northeast of the city of New 
aven, : 
Similar facts have been observed through other parts of the 
Connecticut valley. Professor E. Hite states, in his 
western limit of the old Connecticut valley. He says also (p. 
605), that bowlders of quartz containing manganese and iron 
res in peculiar concretionary forms, derived from Conway 
Conway near the east border of the valley, and Professor B. K. 
Emerson, of Amherst, informs me that they occur farther east 
In Pelham. 
e 
NN. w. direction from Brid 
12° 'W. trom New Haven. e 
