THE ERRATIC 



527 



A VERY REMARKABLE CASE OE ONE hKRATli. SUPERIMPOSED ON ANOTHER 



The upper one of coarse granite, the lower one of granite gneiss resting on a granite 

 ledge. They are situated at Sunnyridge farmhouse, 3 miles west-northwest from Barre, 

 Massachusetts. From photo by Mr. C. W. Alden, of the U. S. Geological Survev. 



THE WASHINGTON BOULDER NEAR CONWAV, XKW HA.MPSHIRE 

 From negative in possession of the Geological Society of America 



