238 proceedings: geological society 



3. Readvance of ice border. 



Lake Whittlesey, discharge by Ubly outlet to Lake Saginaw. 

 Lake Saginaw, discharge by Grand River outlet to Lake Chicago. 

 Lake Chicago, discharge by Chicago outlet to Illinois River. 



4. General recession of ice border. 



Lake Waj^ne, discharge by Syracuse outlet to Mohawk River. 

 Lake Chicago, discharge by Chicago outlet to Illinois River. 

 Lake Duluth, discharge bj^ St. Croix outlet to Mississippi River. 



5. Readvance of ice border. 



Lake Warren, discharge by Grand River outlet to Lake Chicago. 

 Lake Chicago, discharge by Chicago outlet to Illinois River. 

 Lake Duluth, discharge by St. Croix outlet to Mississippi River. 



6. General recession of ice border. 



Lake Lundy, Elkton, Dana discharge bj' Syracuse outlet to 



Mohawk Valley. 

 Lake Chicago, discharge by Chicago outlet to Illinois River. 

 Lake Duluth, discharge by St. Croix outlet to Mississippi River. 



7. General recession of ice border. 



Lake Iroquois, discharge by Mohawk outlet. 

 Lake Erie, discharge by Niagara outlet to Lake Iroquois. 

 Lake Algonquin, discharge by (a) Trent outlet to Lake Iroquois. 



(b) By St. Clair outlet to Lake 

 Erie. 

 Lake Agassiz, discharge by River Warren to Mississippi River. 



8. Ice border north of Great Lakes watershed. 



Lake Nipissing, discharge by (a) Ottawa outlet to Champlain Sea. 



(b) Part discharge by St. Clair outlet 

 to Lake Erie. 



(c) Full discharge by St. Clair outlet 

 Lake Erie, discharge by Niagara outlet to Lake Ontario or Cham- 

 plain Sea. 



Champlain Sea in St. Lawrence valley. 



Close of Lake Agassiz, probably eastward discharge to Lake 

 Algonquin followed by northeastward drainage to Hudson Bay. 



9. Modern lakes discharging by St. Lawrence River. 



R. W. Richards, Secretary. 



The 266th meeting was held in the lecture room of the Cosmos Club, 

 February 26, 1913, and the following informal communication was pre- 

 sented : 



Asphalt in a basaltic amygdaloid from British Columbia: Norman L. 



BOWEN. 



The formal communications were: 



The zinc-lead deposits of the Yellow Pine district, Nevada: J. M. Hill. 

 The Yellow Pine district is in the southwestern part of Clark County, 

 Nevada, near the California hne. The mines are located on both sides 

 of the southern Spring Mountains over an area of nearly 400 square 



