Dr. J. R. KiNAHAN 071 the Genus Oldhamia. 



553 



Explanation of Section. 



1. Greenish-gray bed of closely compressed (?/(//iaHiia radiata, 



12 inches thick. 



2. Green compact quartzose grit, underlying greenish-gray 



schist, OQ which it also rests ; 7 feet 7 inches thick. 



3. Thin layer of Old. radiata, badly marked, lying on green and 



red schists, which are interspersed with vertical and hori- 

 zontal Areoicolites, and gradually paas into red grit ; from « 

 18 inches to 2 feet 6 inches thick. 



4. Red shale ; fine red micaceous gritty slate ; compact red 



shale ; 9 inches thick. 



5. Oldhamia radiata in series of beds from 0*25 inch to 3 



inches, interstratified with compact red shale ; series of beds 

 15 to 24 inches thick. 



6. Oldhamia radiata, in thin beds, interstratified with red shale 



and green grit; 12 inches tliick. 



7. Compact red grit, with traces "resembling coral ; 15 inches 3 



thick. 



8. Compact red shale ; 6 inches tliick. / 



9. Red schist and Oldhamia radiata, in beds, passing into red 



grit^ scattered fans of Oldhamia antiqita also rarely occur ^ 

 here; 15 inches thick. 



10. Grit, similar to No. 2. ^ 





Ct o, Oldhamia beds. 



^-^— C c, Schist and slates. 



O b, Quartzose grit beds. 



d d, Shales. 



^ f, Coralloid traces. 



7 

 8 

 9 



10 



Vertical Section of Rock in neifihboiirhood of Periwinkle R/jcks. Bray Head, showing General Kelations, and 

 Lie of the Fosailiferous Strata. These beda are much distorted. 



