GREENSTONE SCHISTS IN SAN JUAN MOUNTAINS 509 



the Archean. The greenstones of the San Juan Mountains are most 



clearly associated with Algonkian rocks, and, aside from their litho- 



logical similarity, there seem to be no good reasons for attempting 



to correlate such distant occurrences as the Quinnesec and Irving 



schists. 



Ernest Howe. 



Washington, D. C. 



