BULL. GEOL. SOC. AM. 



VOL. 23, 1911, PL. 27 



FiGuuE 1. — View across the old Channel between Mosquito and Cold Springs 



Creeks 



South 4S degrees west from point A oii the map 



FiGLKE 2. — Eroded Alllvum or the ancient Mosquito Channel, with thi: Missduui 



in the Background 



View so\itheast from C on the map 

 PRE-WISCONSIN CHANNELS IN SOUTHEASTERN SOUTH DAKOTA 



