Fig. 22. Fig. 23. Fig. 24. 



Fig. 22. — Approximate area once covered by the Hudson-Champlain water body on the assump- 

 tion that it was a lake. The outline does not include the highest levels reached as the ice was retreat- 

 ing from the Brooklyn-Perth Amboy moraine to Kill van KuU, nor does it include the extension of the 

 area into Long Island Sound. 



Fig. 23. — Approximate area once covered by Higher Glacial Lake Champlain. No attempt is 

 made to show the northern limit. 



Fig. 24. — Approximate area covered by " Marine " Champlain. No attempt is made to show 

 the northern limits reached by these waters. 



