16 



VICTOR E. SHELFORD. 



>t" Lake Michigan. Here it depo-ited what is known as the 

 Valparaiso Moraine. When the ice ret reated from this position, 

 it occupied the basin of Lake Michigan a little to the north of 

 the present south end of the Lake. \Vateroccupiedthespace 

 between this lobe and the Valparaiso Moraine. This body of 

 \\ater is known among geographers and geologists as Lake 

 Chicago. At its period of maximum extent (see map), it stood 

 55 to (>o feel above the present lake. The history of Lake Chi- 

 cago and the other predecessors of Lake Michigan is complicated 



TABLE I. 



SHOWING THE DISTRIBUTION OF FISH i\' THE NORTH SHORE STREAMS AT THE 

 TIMKS INDICATED. Thr numl i- refer in Fig. 2 and Fig. 4. 



'Th<- lower part oi ivttiln.in ( n--k has been destroyed by the U. S. Naval Schm.1 

 otherwise tin- table would include- the records for a point 5 and perhaps a point 6. 



but probably not 7. 'i indicate iu.uiuplct.i- identification. 



