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Quart. Joum. Geol. Soc Vol. LXyJU,FL UV. 















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INDEX OF COLOURS 





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Upper 



^GirvcuvdZa 'boavdi 

 Cyftina-scptoscL band 



Loy\'er 



J^fenrnX^piv/lhuTXy-rnxruis. sub-zone 



CyrtbiM.-c(x.7^h(jricvricL. sub-zone 



GctstropccL Beds. 



Ov.ccirirva.ta sub-zone _ 

 orlKckelirvuL Zone iznt^udjm. 



C. isvrhyThchci sub-zone 



SerrvinJUijia.-gregciHjCL sub~zgne 



Th^sojwpJiydum- bctrvdi. 



Pglobostus iaruZ liAlgnl letter' athcose 



Solertopor^a sub-zone. 







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We'iier^Graham. l'.^ Lifrc.Lc'~don 



