Table 4. — Temperatures C° 



-Temperatures C° of Lake Michigan off Ludington, Manistee, and Frankfort 

 Michigan, 1930 and 1931. Station (Sta.) numbers under 100 were occupied 

 in 1930; those between 100 and 200 were occupied in 1931. Depths (D) are 

 recorded in meters. Locations of the stations are shown in table 1 and 

 on the map. Thermoc lines are indicated between two horizontal lines. 

 [C = cruise; D = maximum depths; S = surface] 



X/ Probably a thermocline between 10 and 15. 



10 



