TJPPEE GEEEJTSAKD AND CHLOEITIC MAEL. 



373 



beds, the lower 2| feet, "with few fossils, divided by a layer of phos- 

 phatic nodules (with broken Pecten asper) from the upper 3| feet, 

 which are rich in fossil remains. The best sections are at Yentuor- 

 station quarries and below Old Park, St. Lawrence. 



Ammonites varians, Sow. 

 Pleurotomaria sp. 

 Hamites sp. 

 A. curvatus, Sow. 

 Rynchonella Grasiana, D'Orb 



A. Fossils derived, in phosphate. 



Solarium ornatum, Sow. 

 Pecten asper, Lamk. 

 Venus sp. 

 Cinulia sp. 



Gibbula lasvistriata, Seel. 



B. Fossils slightly phosphatic. 



Ammonites Coupei, Brongn. 



varians, Sow. 



Mantelli, Sow. 



■ navicularis. Mant. 



curvatus, Mant. 



sp. 



Hamites attenuatus, Sow. 

 Scaphites sequalis, Sow. (very 

 rare). 



Nautilus elegans, Sow. 



• expansus. Sow. 



Turrilites Morrisii, Sharpe. 



tuberculatus, Bosc. 



Wiestii, Sharpe, 



Emarginula sp. 

 Terebratulina striata, Wahl. 



biplicata, Sow. 



semiglobosa, Sow. 



Plicatula pectinoides. Sow. 

 Ehynchonella Grasiana, D'Orb. 

 Pecten orbicularis, Sow. 



Beaveri, Sow. 



interstriatus, Leym. 



Terebratula peetita, Sow. 

 Discoidea subuculus, Leske. 

 Micrabacia coronula, Goldf. 

 Cidaris vesiculosa, Goldf. 

 Vermicularia concava, Sow. 



This Chloritic or Glauconitic Marl has caused considerable con- 

 troversy as to its origin. I think the presence of phosphatic nodules 

 between the two beds, together with crushed Pecten asper in great 

 numbers, has not been sufficiently noticed. This would suggest a 

 violent and sudden destruction in the phosphate bed, while in the 

 upper 3J feet nearly all the Mollusca remain fairly perfect, and 

 Pecten asper is not found. 



Mr. A. J. Jukes-Browne suggested the name of " zone of Scaphites 

 cequalis " for this marl ; but as it is extremely rare to find a specimen 

 of this Scaphites lower than the Chalk Marl, I would propose "zone 

 of Turrilites Morrisii" which is peculiar to the Chloritic Marl. 



The best sections and measurements of the Isle-of -Wight Upper 

 Greensands were made as far back as 1849 by the late Capt. Ibbetsor. 

 These, together with measurements lately made by Dr. C. Barrois, of 

 Lille, I prefix to my own section. 



Capt. Ibbetson. ^ ^ 



1. Zone of chert and rag with P. orbicularis, P. 5-costatus ... 15 



2. Conglomerate of chert and rag 4 



3. Chert and firestone 5 2 



4. Freestone and layers of rag 11 6 



5. Pag and malm 16 8 



6. Mammillary rag, sandy boulders with phosphate of lime .. 16 



7. Malm and rag 6 8 



8. Fossiliferous malm 3 



9. Malm and rag 40 



103 6 



Q. J. G. S. No. 147. 



2c 



