Smithsonian Report. 1939. — Bassler 



Plate 3 



1. Hard Rock Outcrops at Old Bear pits in Zoo Near Harvard Street 

 Gate. Showing Granite Intrusion With Metamorphic Schists on Either 

 Side. 



2. Alluvial Plain Along East Side of Rock Creek With Schist Cliffs 

 Capped by piedmont Plateau. 



