MIDDLE LIAS : KEYTHORPE. 
235 
FIG. 69. 
Section between Keythorpe and Hallaton, Leicester shire. 
(Prof. J. W. JUDD.) 
a. Soil, &c. 
TT T . f b. Fish and Insect limestones. 
Upper Lias | c< Ckyg> 
VTJ;M T- { , ' d. Marlstone Rock -bed. 
Middle Lias 
Along their outcrop from Deepdale to beyond Cranhoe, the 
lower beds of the Middle Lias series are almost wholly unknown, 
owing to the prevalence of Drift. A brickyard at Belton exposed 
the clays with Ammonites margaritatus, &c. 
At Godeby (as Prof. Judd remarks) the Marlstone Rock-bed 
can be seen in some ditches on the spurs above the village. The 
remarkable manner in which the stratum is here reduced to only 
a foot or two in thickness, while it has at the same time almost 
wholly lost its calcareous character and its hardness, is very 
striking ; especially when we remember that the locality is only 
about four miles distant from that of Robin-a-Tiptoes, where the 
rock attains its maximum dimensions. But insignificant as the 
rock has become, it has still been able to resist denuding forces to 
a much greater extent than the clays above and below it, 
and consequently forms a well marked and very conspicuous 
escarpment.* 
* Geol. Rutland,?. 72. 
