448 NEW YORK STATE MUSEUM 



its flat surface being utilized by the Chateaugay Railroad for a 

 roadbed, while Sumner creek works its sluggish way through it 

 in a beautifully typical, meandering course; Ray brook may be 

 seen flowing through a small, filled pond on the southeastern 

 part of the map; on the extreme southwest, the marsh which 

 fills the former east portion of Middle Saranac, locally called 

 Round lake, is well shown; on the northwest, the Osgood river 

 flows into the pond of the same name through a swamp which 

 marks its filled northern extension ; the south end of Colby pond 

 is converted into a marsh ; on the other hand. Lower Saranac and 

 Rainbow lakes, Mackenzie, Moose and Lonesome ponds are not 

 yet sufficiently shallowed anywhere to show more than a mere 

 beginning of marsh vegetation. On the Blue mountain quad- 

 rangle there are fewer examples, but Polliwog pond, on the ex- 

 treme north and just east of Long lake, is marsh except for the 

 small lagoon yet remaining in the center; Rock lake as marsh 

 at the west ; and the Grassy ponds, on the east near the Chain 

 lakes, have names which imply their condition. These are but 

 two examples selected at random from among the 20 Adirondack 

 sheets so far published. Any of the remainder would have 

 served equally well. Those lakes oriiginally the shallowest, and 

 those into which sediment is being, or has been washed the most 

 rapidly, are of course those in the most advanced stage. 



According to RieSf while lake filling is going on at many points 

 in the Adirondack region, yet very little true peat seems to have 

 been formed, for the streams flowing into the lakes often carry 

 too much sediment, and plants other than mosses usually fill up 

 tlie lake.^ 



IN. Y. State Geol. 21st An. Rep't. 1903. p.r85. 



