(.i.AciAL roriioij-: 



I'j 



Before (Miteriiiu; the Miiseiiin one notices the ''Heiicli M:irk" estiih- 

 lisluHl by the l'. S. (le()l()«;i(';il Survey in 1911 on which is 

 inscribed the hititude and lon,ti;it ude, 10° lb' 17.17" N., 

 73° r)8' 41'' \V., iind liein;iit iibove sea level, Sb feet. 



On the ri^ht is a "])()th()l(^" from I{ussell, St. Lawrence Co., X. \., 

 formed by an eddy in the waters of a stream beneath the 

 meltinii; ici^ of the <2;laci(M' that covenMl Northern New York. 

 The stnnim carried ])el)bles that, whirled around by the 

 ind <>;round this hole, which is two feet across and four feet 



Bench Mark 



Glacial 

 Pothole 



Glacial 

 Grooves 



eddy, cut 

 deep. 



On the left is a lar<2;e slal) of fossiliferous linu^stone from Kelleys 

 Island in Lake Erie near Sandusky, whose surface has becm 

 smootlunl, <>;ro()V(Hl and scratched })y the stones and sand 

 in the bottom of the vast moving ice sheet or glacier that 

 covered the northeastern part of North America during the Glacial 

 Epoch. The front of this continental glacier is now tliought l^y most 

 geologists to have retreated northward across Lake Erie from 30,000 

 to 50,000 years ago. At Kelleys Island the ice was moving from east 

 to west. 



AT THE ENTRANCE TO THE MUSEUM 



