6 F. L. KitcJiin and J. Pringle — 



Lima globosa J. de C. Sow., the type of which came from the Chloritic 

 Marl. This species has also been recorded from lower horizons, 

 but has not been found below the Gault. 



After the publication of the account of the section, Mr. Lamplugh 

 collected some fossils from an inconstant layer of green sand, attaining 

 in one place 5 feet in thickness, found to be intercalated between 

 the limestone-lenticles with brachiopods and the Gault above. 

 The specimens comprised nothing to indicate a Lower Greensand 

 or Lower Gault age, but Mr. Lamplugh was nevertheless inclined 

 to correlate the deposit with the mammillatus bed at the base of 

 the Gault. ^ These fossils included well-developed valves of Ostrea 

 vesicularis Lam., such as are found in the zone of Pecten asper 

 Lam. ;^ also Ostrea canaliculata (J. Sow.), a species which occurs 

 much more commonly above the Gault than below it. There were 

 numerous specimens of Serpula antiquata J. de C. Sow., a common 

 fossil in the Pecten asjoer zone of Wiltshire. A few associated 

 cirripede-remains were later studied by Mr. T. H. Withers, who 

 Idndly furnished us with some notes upon them. He reported that 

 a scutum and a carina must be referred to Pollicijyes glaber F. A. 

 Koem., and that agreement is closest with specimens from the 

 Chalk Marl. The carina has a narrower base than that of P. unguis 

 J. de C. Sow., from the Gault of Folkestone. Another specimen 

 is a scutum which may best be compared with Pycnolepas rigidus 

 (J. de C. Sow.), " although it is in some respects rather more advanced 

 in certain characters than the typical valves of that species." 

 P. rigidus occurs in the Gault, and Mr. Withers believes that the 

 more advanced evolutionary characters shown by the valves from 

 Shenley Hill indicate a later geological age. He points out that 

 nothing is known from below the Gault with which any of these 

 remains can be compared, and he considers that they furnish evidence 

 that the sand in which they occurred is newer than the Gault. 



It is important when considering this disputed question of age 

 to look into the literature dealing with the faunas of the zones just 

 prior to the mammillatus bed, as developed on the Continent ; that 

 is to say, the Beleinnites stromhechi beds in Brunswick (with the zone 

 of Leymeriella tardefurcata at the top) and the Clansayes zone of 

 South-Eastern France. It becomes more than ever clear that the 

 life of that time resembles in no manner that of the brachiopod- 

 bed at Shenley Hill, supposed to be of comparable age. Indeed, 

 this bed furnishes such strong faunal links with the " Cornstones " 

 of Wiltshire and contiguous strata ^ as, in our opinion, to leave no 



^ "Excursion to Leighton Buzzard": Proc. Geol. Assoc, vol. xx, pt. vi, 

 1908, p. 475. 



- H. Woods, Monograph of the Crefaceov,s LameUihranchia of Eiigland, 

 Pal. Soc, vol. ii, pt ix, 1913, figs. 143-5, p. 367. 



^ A. J. Jukes-Browne. The Cretaceous Rocks of Britain, vol. ii, " Tlae Lower 

 and Middle Chalk of England" (Mem. Geol. Surv.), 1903, p. 148. A. J. 

 Jukes-Browne & J. Scanes, " The Upper Greensand and Chloritic Marl of 

 Mere and Maiden Bradley, in Wiltshire " : Quart. Journ. Geol. Soc. vol. Ivii, 



