312 Remews—Dr. A. W. Rowe-^Zones of the White Chalk. 



' Dr. Kowe commences with an excellent description of the cliff- 

 section from White Nothe to Bats Head, which comprises all the 

 zones of the Middle and Upper Chalk from the zone of Rhynchonella 

 Cwoieri to that of Actinocamax quadratus. He points out that the 

 layers of yellowish green-coated nodules which had been called 

 • Chalk Rock ' really occur in the upper part of the Terehratulina 

 zone, and in no way represent the Chalk Eook. To my own knoA 

 ledge it is just the same in the Isle of Wight ; in both areas 

 equivalent of the Chalk Eock is^^fegefiDl^Si^i^ftfe'n^^^pffi 

 the zone of Holaster plamis, which consi^.a[^,ji£iaJifii£yJLsyte,7ialk 

 without any beds of hard limestone. Each _aQnB-i«— ttm~BQiite 



m&tiM 



snc&qH 



Nothe section is 

 and of^tSte^i^teS 



'^'^'^f^icromta, iilthoi 

 The zonal dBta 



del 



^ •ahi 8~ 



!Mffl! 



its characteristic 

 iiMo&li 



the still higher 



of Bef 



^ zone 



that is OUnd inland. /^o-muarnbalamizDriqijft. 



i"oFaTrtle other accessible cliffs arejbroated irPflafeF:^:^.. 

 Du -die Co -e. Man of War 0^ve,"L'ul worth, 

 Mupe Bay, Arisl/Mell, anc W^lMlMiSay ; and/though in some 

 places the ChalY ^^ ^^ crush 3d that measurements ai'e of small ■' alue, 

 the determination ofjthe__zoies which enter into /tlie composition of 

 s our knowledge much beyond mat of any previous 



Studlf 

 pen 



ft, and tJ 



plly, the cliffs which extend fram. Ballarcr"Foi it to 

 are described as fully as the difficultife^^i^^cesd will 



^^^. III of these studies, 



ronshi 



beautiful 



iwiflj 



and 



portions of the clifis betw. 



amw 



6 zones of Marsupites, Act. qtiadratm , and 

 or the .first tim/e correctly indicated 3noS- gili36i{(.T 

 ition of the Chalk of the 



^illsju^^spulili fesd in May /ot-lhis=year, a»3^ in some 

 3 mos t interestii g, as it is /certainly ffie' most fully and 

 ■^fl^i^^feaife^ J%~series,/for it includes twelve plates 



-si 



■M^cambe, 



The 



general stratigraphy of ty^Dey^n ChalOgi^^S^^^jS^jra 

 3ublication of Professcir Barrois' " Recherches " in 1876, 

 for he was ^he fif^^^aScertain/that the greater part of the Lower 

 Chalk is absent, and that the/beds which include the Beer Stone 

 belong to the Turohian or Midpe Chalk. More detailed and accurate 

 knowledge of the structure of these cliffs has Weif m my possession 

 for many years, but beiW destined for a Geological Survey memoir 

 its publication has beenXIong delayed. Meantime Dr. Rowe has 

 visited the coast, and hasXexplored the beds in some places more 

 minutely than I was able to a^, the result being an excellent guide 

 to the Chalk of Devonshire. 



Beginning with the Pinhay^ cliffs near Lyme Regis, he shows 

 that they exhibit good sections of the zones of Bhynch. Guvieri, 

 Ter. gracilis, Hoi. planus, and Micr. cortestudinarium, and his careful 

 collecting of fossils has enabled him to delimit the zones in this 

 section more accurately than any previous observer. The same 



succession is fo'^^rf g%iii ^hPf ®^l9ft^fl4 •'^^^v^^'^'if ^"i^^^®® ^^^''^ 

 3Z2!i^hat the summit ot th^ zone otmicrdsier cortestuatnarium is not 



