110 



THE LIASSIC PERIODS. 



CHAP. 



Limestone, shelly. 'Grizzle bed' 



Dark, hard, stony clay. ' Ruskins' 



Limestone, dark blue, and clay 



Dark laminated clay . 



Limestone, dark grey . 



Limestone, hard crystalline (three beds) 



ft. in. 

 o 3 

 o 



7 Plesiosaurus megaceplialus. 

 9 



J ") Ostrea liassica, Modiola mi- 

 ^2 C nima, Cardium. 



2 J 



Hard dark shale 



Limestone, shelly. * The Guinea bed ' . 

 Green chinchy shale . 



WESTBUEY SHALES. 



Greenish marl. Estheria bed 

 Blackish shale, not laminated 

 Greenish, black, closely-laminated, mi- 

 caceous shale . 

 Closely-laminated shale 



Shale, laminated. Upper Pullastra bed 



Hard, close shale, not laminated . 

 Dark clay and shale . 

 Strong laminated clay, with septaria 

 Clay with shells. 'Pectenbed' . 

 Black, hard, laminated clay . 

 Pyritic stone with shells. ' Lower Pul- 

 lastra bed ' . . . . 

 Black clunchy clay . 

 Light, soft, brown clay 



I O 



O I 



3 o 



2 Estheria minuta. 

 12 6 



1 O 



o 6 



, JAvicula contorta, Pullastra 

 1 arenicola, Cardium. 



2 6 



6 



1 3 



I 8 Pecten Valoriiensis. 



4 o 



The lias beds, here seen to the extent of above twenty-one feet, are 

 only the lowest beds of the series alternations of calcareous and 

 argillaceous sediments laid with wonderful regularity in thin gently- 

 sloping strata. The limestone is valuable for many purposes. It 

 has the quality,, very common in lias limestone, of yielding lime 

 which sets rapidly and very firmly in water a quality due to the 

 admixture of earthy and ferruginous matter with the pure car- 

 bonate. Its broad lamina make admirable paving stones (if well 

 selected, very durable), and handsome floors are constructed of its 

 squared blue and white beds. For these reasons the stone is quarried 

 at several places near Shipton, Stratford, Southam, and other places 

 on the line to Barrow-on-Soar. 



At Binton, near Stratford-on-Avon, Mr. Robert Tomes made a 

 section through almost exactly the same series of beds as those at 

 Wilmcote; and it is the more interesting to make a comparison 

 of these two localities, as some of the local names of the beds are 



