GEOLOGY : NORTH SHORE. 19 



few days. To the north, along the electric line, sections of the 

 western lobes are exposed by excavations for a reservoir, and the 

 till beneath the plain laid bare. South of Commonwealth avenue 

 the convex terminal lobes of the plain are developed finely. Still 

 farther south and southwest lies the remnant of a swamp with clay 

 bottom, now largely filled in by human agency. Three hills project 

 above the general level of the plain. They are a drumlin and 

 two kames, older than the plain and partly blanketed by it. The 

 illustration of Gulliver's model shows them well. 



Literature. 



Davis, W. M. — The subglacial origin of certain eskers. (Bos. Soc. 

 Nat. Hist., Proc, vol. 25, pp. 477-499.) 



Davis, W. M.— Structure and origin of glacial sand-plains. (Geol. Soc. 

 Am., Bull., vol. 1, pp. 195-212). 



Gulliver, F. P. — The Newtonville sand-plain. (Journ.of Geol., vol. 1, 

 pp. 803-812.) 



AUBCRNDALE. 



Route. — By rail, Boston & Albany road, Kneeland street station, to Au- 

 burndale. It is best not to go by wheel on account of the cross-country 

 walking. Prom the station turn to left along the main street, to right up 

 Grove street (first turn), to left along Woodland avenue, past grounds of 

 Lasell seminary, to right up Seminary avenue, to left up Oak Ridge 100 

 feet. 



The beginning of the esker near the Seminary grounds cannot 

 be seen well. The coarseness of the material in the excavation 

 near the house at Oak Ridge is noteworthy, the presence of two 

 large boulders particularly. The variation in texture from here to 

 the terminus at Woodland is much greater than in the Newton- 

 ville case. The cross-section profiles of the ridge at various points 

 are very different, and the changes in this correspond in a general 

 way to changes in height and direction of crest-line as noted by 

 Woodworth, who drew some of his conclusions as to the origin 

 of certain eskers in subglacial tunnels from a study of this ridge. 

 Davis also used the region between Auburndale and Waban in 

 reaching the same results. 



The topography of the neighboring surface is normal, the land 

 being swampy, with the exception of some kanie and kettle por- 

 tions in Auburndale. A branch esker a few hundred feet long runs 

 off from the west side of the main ridge between Auburndale and 

 the railroad crossing, evidently the cast of a side tunnel. The cut 



