374 



C. PAHKINSON ON THE ISLE-OF-W1GHT 



Dr. Barrois. 



I C E Chloritic marl 



I s < D Greensand and chert 



[ C Greensand, phosphatic nodules 



J f B Yellow sands with bands 13 



1? \ A Micaceous, glauconite sands 117 



^ 



170 6 



(The order of this section is reversed for uniformity.) 



Section of Upper Greensand and Chloritic Marl, St. Lawrence 

 and Ventnor, Isle of Wight. 



Chloritic marl 3£ feet (fossils list B, slightly phos- 

 phatic). 



Hard phosphatic nodules, with crushed Pecten asper. 

 2| feet compact, darker grains : few fossils, mostly 

 derived. 



Blue chert bands ; casts of Cardium sp. 

 Coarse greensand ; casts of Cucullaa glabra, and 



Holaster sp. Chert. 

 Greensand : Ostrea, Cucullcea, Area. 

 Chert : Lima sp. 

 Chert : Pecten interstriatus. 

 Greensands: P. orbicularis. 

 Chert with sponge-spicula imbedded. 



5 feet freestone, used for building-purposes: casts of 

 Nautilus pseudoelegans, N. elegans. 



Chert, with phosphatic nodules. 



6 feet inferior building-stone : casts of Nautili. 

 Amm. rostratus here attains its greatest development. 

 Blue chert. 



32 feet yellowish-red sandstones, varying in hardness. 



Organic remains few. 

 Holaster Icevis (on the authority of Dr. Wright). 

 Zone of Amm. inflatus, Sow. A. auritus, A. rostratus, 



Panopcea, C'ucull&a, Area, Trigonia. About 4 feet. 

 Compact red sands. 



Species of Ammonites undetermined, between A. rostra- 

 tus and A. auritus. 

 Compact red rock, harder than the above, 20 feet, 



unfossiliferous. 

 Blue rag, fossiliferous. Astaciform Crustacea, Che- 

 Ionia ; passing into Gault sands. 



It will be found that the three measurements agree very nearly. 

 Dr. Barrois includes the 50 feet of sands below the lowest two-foot 

 bed of chert nodules, as has been done in the Geological Survey 

 Memoir. In Dr. Barrois's hasty visit to the Isle of Wight, I think 

 he inaccurately divided the zone of P. asper and A. inflatus, both of 

 which are confined to extremely narrow limits. With regard to 

 Capt. Ibbetson's measurements, I think the zone of fossiliferous 

 malm is placed too high up ; otherwise the section is very accurate. 



In conclusion, I would call attention to the necessity for greater 

 care in separating the fossils of each zone. Thus Pecten asper, P. 



ft. in. 



8 



26 



6 6 



/ 



6 feet... -j 

 I 



} 



24 feet... - 



14 feet... i 



56 feet... -j 

 i 



2 feet... 

 102 feet... 



