A. E. Trueman — The Lias of South Lincolnshire. 109 



Yorkshire.' The Oolite Bed, in the upper part of which this fossil 

 was found, probably represents a period of slow deposition.'' This 

 period is similarly represented in Northamptonshire, where it lasted 

 longer, during the deposition of the sulcarmatum sub-zone, which is 

 consequently much thinner than in Lincolnshire.^ 



O 



§ > 



cS 



■ Cfl 



^=« o 



[/I o -^ 



'o'-i • 



^ o 



m C 



'3 _| 05 

 O 5D 



•3-3 2 



l|-s 



:2 ^ 



' S. S. Buckman, Geology of Whitby, etc. (Mem. Geol. Surv.), 1915 

 pp. 75, 102. ' 



- H Preston & A. E. Trueman, "Oolite Grains in the Upper Lias of 

 Grantham " : Naturalist, 1917, p. 217. 



^ B. Thompson, Northamptonshire (Jub. Vol. Geol. Assoc), 1910, p. 462. 



