er. 2D eS 
ARAL 
Bulletin of the Museum of Comparative Zoölogy 
AT HARVARD COLLEGE. 
Vou. XLIX. 
GEOLOGICAL SERIES, Vol. VIII, No. 4. 
THE ORIGIN AND STRUCTURE OF “THE ROXBURY 
CONGLOMERATE. 
By Groree Rogers MANSFIELD. 
WirH SevEn PLATES. 
CAMBRIDGE, MASS., U. S. A.: 
PRINTED FOR THE MUSEUM, 
NOVEMBER, 1906. 
