MUSEUM OF COMPARATIVE ZOOLOGY. -33 



throughout the town of Richmond occasional boulders of the same rock 

 may be observed. Good specimens of boulders of this sort may be seen 

 on the southern slope of Mount Osceola, a short distance southeast of 

 Squire Bacon's. 



BUFF LIMESTONE BOULDERS. 



A compact buff limestone, with interlacing fissures on the weathered 

 surface, has been referred to (page 23) as lying adjacent to the gray 

 limestone just mentioned. The boulders of this rock have a distribu- 

 tion similar to that of the gray limestone boulders. One of them, eight 

 feet in diameter, is situated upon the crest of the Western Branch of 

 the Richmond Range, at the crossing of the principal boulder train, and 

 another, six feet in diameter, occurs at a distance of one fourth of a 

 mile S. S. W. from the summit of Perry's Peak, The former is 600, 

 and the latter 800 feet above any known exposure of the same kind of 

 rock in place. 



SUPPOSED LIMESTONE TRAINS. 



It was stated by Sir Charles Lyell and Rev. J. B. Perry that a num- 

 ber of limestone trains originated upon the Richmond Range, and ex- 

 tended across the Richmond A^alley. (See references at beginning of this 

 paper.) So far, however, as the observations of the present writer have 

 extended, the Richmond Range is made up mainly of mica schist. 

 There are, indeed, many rounded blocks of limestone in the Richmond 

 Valley, chiefly along the western side, but they are confined to the 

 limestone area, and there is no reason for supposing that they have 

 been transported any considerable distance ; it is pi-obable, rather, that 

 they were derived immediately from the underlying bed-rock, which 

 they exactly resemble. They could hardly have originate'd upon the 

 Richmond Range, since its only limestones are the two upon its western 

 slope, and neither of them resembles the material of which the blocks in 

 question are made up. 



SUMMARY. 



It is evident, from the relation which the present position of the 

 chloritic schist boulders bears to their origin, that the transportation of 

 glacial material in this region has been in general from the northwest 

 towards the southeast. 



Although all three of the ranges exhibit marks of glacial action 

 wherever their bed-rocks are exposed, none of them afford trains of 

 boulders except the Canaan and Lebanon Range. Fragments of mica 



