1855.] on Trains of Erratic Blocks in Massachusetts. 



87 



Distance in a straight line between the mountain ranges A and C, 

 about eight miles. 



Map, showing the relative position and direction of seven trains of erratic 

 blocks in Berkshire, Massachusetts, and in part of the State of New York.* 



A. Canaan range, in the State of New York. The crest consists of green 

 chloritic rock. 



B. Richmond range (part of the Taconic range of Hitchcock ?) the western 

 division of which consists in Merriman's Mount of the same green rock as A , 

 but in a more schistose form, while the eastern division is composed of slaty 

 limestone. 



C. The Lenox range, consisting in part of mica-schist, and in some dis- 

 tricts of crystalline limestone. 



♦ As the description of the trains could not be undei-stood without a ground 

 plan, the above copy of a diagram, exhibited during the discourse, is thought 

 necessary ; but it makes no pretensions to geographical accuracy, the speaker 

 and his companion Prof. Hall having been unable to procure a good map of the 

 district, ^u which to lay down in detail the results of their observations. 



