62 GUIDE TO LOCALITIES. 



1894. * Crosby, W. 0. and Ballard, H. 0. Distribution and probable age 

 of the fossil shells in the drumlins of the Boston Basin. (Am. 

 Journ. Sci., 3d ser., vol. 48, pp. 486-49G.) Fifty-live species of 

 fossils, from twenty-four localities. Detailed discussion of 

 occurrence and source of fossils. 



C. Undisturbed deposits. 



1865. Hitchcock, C. H. Impressions (chiefly tracks) on alluvial clay in 

 Hadley, Mass. (Am. Journ. Sci., 2d ser., vol. 19, pp. 391-393.) 

 Impressions of thirteen Icinds of animals (man, four birds, two 

 quadrupeds, one batrachian, snails, annelids, two or three of 

 doubtful character) on clay beneath twenty feet of alluvial sand 

 with ferruginous concretions. Compares with Triassic tracks. 



1868. Stodder, Charles. On a recent gathering of diatomaceous mud 

 from Pleasant beach, Cohasset. (Bost. Soc. Nat. Hist., Proc, 

 vol. 11, p. 132-134.) Many species of diatoms collected from 

 mud of marsh directly in the rear of the Minot house. 



1893. *Upham, Warren. Recent fossils of the harbor and Back bay, 

 Boston. (Am. Journ. Sci., 3d se<'., vol. 43, pp. 201-209, and 

 Bost. Soc. Nat. Hist., Proc, vol. 25, pp. 305-316, this latter 

 with additional note.) List of twenty-tive species from Brook- 

 line, Charles river and South Boston; to which are added from 

 South Boston twenty-six species, making total of flfty-one, 

 twenty-four of which are southern. 



