1881 .] 
203 
[Dodge. 
and Mt. Vernon Street in Dorchester, where rock might be 
expected to show itself prominently, considering the strike which 
prevails to the westward, are noticeable. Glaciation seems to have 
been the cause of the existing condition. Five-eighths of a mile 
north of the quarry in the south-east angle of Dorchester Avenue 
and Mt. Vernon Street, excavations in October, 1880, showed 
puddingstone (where, indeed, its presence was inferentially cer- 
tain) under the small hill crossed by Dorchester Street, west of 
the Old Colony Railroad. The rocks lie very near the surface at 
Middle and Tuckerman Streets. There seems to be a cleavage 
with a northerly dip, but, excepting where a distinct band of sand- 
stone in coarser rock, or line of pebbles in a sandy mass are 
observable, the appearance of bedding in puddingstone is usually 
to be distrusted. This ledge marks nearly or quite the limit 
of northerly extension of the Roxbury puddingstone. 
I am informed that an artesian well at the Suffolk Brewery, on 
the southern shore of South Boston, corner of Eighth and G 
Streets, penetrated between the depths of 35 and 380 feet “ a 
kind of granite rock.” The well was sunk many years ago, and 
samples are now unattainable. 
Slate is said to underlie the r 
at Sixth and Seventh Streets. 
North-westward is the site of an early slate quarry, within the 
limits of a nine-acre piece of marsh and meadow on the west side 
of the old road to Nook’s Hill, of which land E and Sixth Streets 
are nearly diagonals, Fifth and Seventh Streets crossing its north- 
east and south-west corners. The twenty-foot contour line nearly 
bisects this tract, and the quarry was undoubtedly at the foot or 
on the westerly slope of the hill, not far from E, and between 
Sixth and Seventh Streets. This “ quarry meadow ” is named in 
the records during a period of more than a century. Its identity 
and position may be verified by a comparison of the following 
documents : 
1676. Will of Hopestill Foster, Suffolk Probate. 
1704. Suffolk Deeds, Liber 29, fol. 222. 
1709. Do. 24: 200. 
1722. Do. 36: 62. 
1734. Do. 48: 182; 1740,59: 202. 
1757. Will of Benjamin Bird, Suffolk Probate 52; 241. 
egion crossed by Dorchester Street 
