112 THE LI AS SIC PERIODS. CHAP. 



ft. in. 

 28. Limestone, inconstant . .06 'G-ummerals.' Ostrea liassica. 



ag. Clay 



('Firestone beds.' Saurian remains; 

 Cardium ; Modiola minima ; ' My- 

 acites ; Ostrea liassica. In this 

 group of beds only one Amm. plan- 

 orbis has been found. 



33- Clay 02 



34. Limestone . . . o 3 



35- Clay 03 



36. Hard limestone . o I to o 10 'Guinea bed.' Saurian bones; Avi- 



cula longicostata ; Monotis decus- 

 sata ; Lima punctata ; Myacites ; 

 Ostrea liassica ; Hemipedina To- 

 mesii, frequent ; Coral. 

 Total thickness 23 io 



Below are the rhaetic beds, containing Avicula contorta, 20 feet 3 inches in 

 thickness. 



It will be observed that in this section the classification of the 

 'Guinea bed' (= ( Monotis bed' at Westbury, = ' In sect bed' at 

 Wainlode) with the lias seems to be well supported by the character 

 of the fossils, here unusually numerous, in this bed. Avicula longi- 

 costa, Stutch (= A. cygnipes auctorum), Lima punctata, Hemi- 

 pedina Tomesii, are quite of liassic affinity. The frequent occurrence 

 of insects in the limestones which lie a few feet above the ' Guinea 

 bed/ with Ostrea liassica, Ammonites planorbis, and Saurians, 

 makes this section valuable for correlating other less clearly deter- 

 mined localities. 



No other part of the lower lias in the midland counties is much 

 explored, except for brick-making, and in the few cases of railway 

 cuttings and tunnels. In these situations there is seldom found 

 any considerable series of limestone beds, or even of layers of 

 nodules ; in this respect offering a great contrast with the sections 

 of Dorsetshire, where above the thin broad limestone floors like 

 those of Binton and Wilmcote are solid and thick beds with 

 Ammonites Bucklandi, Lima gigantea, Gryphsea incurva, and other 

 fossils never seen in the quarries near Stratford. Yet beds of shale 

 representing these limestones occur in the hills above these quarries, 

 and contain the fossils mentioned, or some of them. 



