418 G. J). Hubbard — Finger Lake Bed in Ohio. 



The Main Lake Bed, Depth of Water and Outlet. — At 

 many points streams in post-lacustrine time have cut channels 

 through delta and beach deposits and have built pretty allu- 

 vial fans in their valley mouths and out over adjacent parts of 

 the lake plain. 



Hundreds of springs issue from the rock hillsides and send 

 their clear wholesome waters down the slopes to the lake plain. 

 These springs not only determine the locations of many farm 

 houses and roadside watering troughs, but keep considerable 

 tracts of the plain in a marshy, miry, condition wholly unfit 

 for agriculture. A dredge ditch has been dug through much 

 of the length of the lake plain. Another close to each side, to 

 catch and conduct away this spring water when it first gets 

 down to the level of the plain, is still necessary to reclaim fully 

 the rich lake plain. 



In the author's previous paper* referred to above, it was 

 stated, through some typographical error, that the " level of the 

 beaches near Funk and Blachleyville was 765 ft." instead of 

 965 as determined by the barometer from the U. S. G. S. 

 levels. The lake in this vicinity could not have been less than 

 50 feet deep, but was shallower in both arms and probably also 

 toward the southern end. 



The outlet was by Lake Fork of Mohican River at the 

 junction of the northern arms of the lake through a valley, 

 still narrow and steep-sided, and probably opened up in some 

 interglacial stage, f over the divide between Funk on the shore- 

 line and Lakeville station on the Pennsylvania railroad. 



At present the lake plain is drained, though as yet some- 

 what imperfectly, by three streams, Jerome Fork in the Ash- 

 land arm, Muddy Fork in the West Salem arm, and a small 

 dredged stream in the southern body ; three streams which 

 unite near Funk to form Lake Fork, both the ancient and the 

 present outlet. 



Attitude of Shore Lines at Present. — Examination of the 

 shorelines led to the belief that they were not as constructed. 

 To make certain just what the condition is, a Y-level was used 

 working out from precise levels and bench-marks of the LT. S. 

 Geological Survey. By this means it was found that the beach 

 lines are far from horizontal to-day. The accompanying sec- 

 tion (fig. 2) exhibits the results graphically. Along the eastern 

 arm and main body from Pleasant Home to Custaloga the 

 altitude was determined at several points. The delta surfaces 

 at Pleasant Home and Redhaw were found to be over 1040 

 feet ; and the shorelines seem to grade down from these sur- 

 faces to 1020 at Rowsburg; 1015 about 1-J miles north of the 



*This Journal (4), vol. xxv, p. 243, 1908. 



t Ohio Naturalist, vol. viii, pp. 349-355, 1908. 



