(;l.\( I \L mriKHJ-: 



On th(^ rililit is :i " pol hole " from Ixusscll. St. I>;i\\ iciicc ( O.. N. \ ., 

 toriHcd 1)\' ;iii {'{\i\\ in the \\;itci's ol ;i sd'cain Ix-iic.-illi tlic 



Glacial 

 Pothole 



lucltiiiii ice of the «i;la('i('i" that coxci-cd Nortlici'ii New 

 \'oi-k. 'The sti-cam carried pchhlcs that, whirled ai-oiiiid 



by the c(U\\ . cut and .ground tliis hole, wliich is two feet across and four 



feet d(H'i). 



On the left is a lar^e slab of fossiliferous limestone from Kelleys 

 Island in Lak(^ Eri(^ near Sandusky, whose surface has 



Glacial 

 Grooves 



l)(>en smoothed, ^rooN'ed and scratched by the stones and 

 sand in the bottom of the vast movinji; ice sluH't or <»;lacier 

 that covered the northeastern part of North America during- the 

 (ilacial Epoch. The front of this continental glacier is now thought by 

 most iieolo.i>;ists to have retreated northward across Lake Erie from 

 30,000 to 50.000 years ago. At Kelleys Island the ice w^as moving from 

 east to west. 



AT THE ENTRANCE TO THE MUSEUM 



