POSTGLACIAL BIOTA OF THE GREAT LAKES REGION 147 



VI. PENNSYLVANIA 



Records of life from the glaciated portion of Pennsylvania are apparently 

 rare. White, 85 many years ago, recorded a marl bed under 2-3 feet of peat in 

 Erie County. The deposit is now one and a half miles from Conneaut Lake 

 and it is thought at one time to have formed a part of this lake. The marl bed 

 is over 22 feet thick and of wide extent, 60 acres being known in one place. 

 The peat bog is 25 feet above the level of the present lake. A second bed of 

 peat is reported under the marl bed. Eight species of mollusks were found in 

 the marl. 



Sphaerium striatinum Planorbis anirosus ( = bicarinalus) 



Amnicola limosa Planorbis trivolvis 



Galba humilis [modicella] Planorbis campanulatus 



Physa heterostropha Planorbis parvus 



Van Rensaelaer 85 * records the mammoth from Beaverdam, Erie County. 

 It was found near the border of a small rivulet about 600 feet above Lake Erie, 

 and not far from the lake. 



VTI. NEW YORK 



Records of the life of the ancient glacial lakes are exceedingly rare from 

 this state. This paucity of knowledge is due doubtless to lack of observation 

 rather than to absence of material. Mollusks (Unios) and wood have been 

 reported from the Ridge Road bordering the south shore of Lake Ontario, 

 which marks the shore of glacial Lake Iroquois (Algonquin stage). 86 No 

 authentic lists of species from this beach have been seen. Eaton, many years 

 ago, reported on the strata in the Erie canal, and mentioned the presence of 

 organic remains in clay deposits. 87 Picea canadensis is mentioned and reference 

 is made to "immense quantities of fresh-water shells. " A list of the Mollusca 

 is given, the identifications being made from Sowerby's Manual. Just what 

 species were really represented it would be difficult to say with certainty. 



Planorbis obtusa Bulla rivalis 



" alba Limnea longiscata 

 " paludosa " minima 



" annulala 



It seems evident that much material of great value was collected from the 

 Erie canal, and it is a pity that some American conchologist, like Say, could 

 not have reported upon the species represented. 



* Second Geol. Surv. Penn., 1879, QQQQ, pp. 40-41, 1881. 

 •» Amer. Journ. Sci., (i), XTV, pp. 31-33. 



• Hall, Geol. of New York, part IV; Bell, Can. Geol., VI, p. 44. 

 •' Amer. Journ. Sci., (i), XXI, pp. 138, 200; XII, pp. 17-20. 



