306 RAMBLES OF A GEOLOGIST. 



when I do. When examining, for instance, the accumula- 

 tion of broken Liasic materials in the neighbourhood of Banff, 

 I made it my first care to ascertain whether the bank inclos- 

 ed fragments of stone or shale bearing the longitudinal mark- 

 ings ; and felt satisfied, on finding that it did, that I had dis- 

 covered the period of its re-formation. 



