390 MR. s. s. BUCKMAv OX [vol. Ixxviii, 



III. The Datixg or the JuxcTioy-BED or Wattox Clief. 



(A) L [)per Lias Succession in other Areas. 



In order to understand the evidence of tlie Junction-Bed of 

 Watton Cliff, it is necessary to investigate the stratal and faunal 

 sequences of other areas. And. as this Junction-Bed contains 

 fauna belonging to dates which i-ange from ^Ye-s^^inatum to 

 Dumortieria — in other Avords, contains fauna of Domerian, T^liit- 

 bian, and Yeovilian ages — it is necessary to make a somewhat 

 extended investigation (1) as to the secj^uence of the Upper Lias 

 (AMiitbian, Yeovilian) : (2) as to the Middle Lias of about 

 sjpinafum (Domerian) date in the Junction-Bed elsewhere : and 

 (3) as to the Domerian -^ve-spinafum beds whicli are found in 

 Thorncombe Beacon. Fii'st and most important, then, is the 

 Upper Lias C/Whitbian) succession, so far as the lower part of 

 it is concerned. This is given in the following summaries. 



I. SirccESSiox IX XoEiiAXDT (according' to E. Eudes-Deslongcliamps).^ 



\hifroiiS- Marnes moveimes. Ammonites hifrons [^Hildoceras spp.~ et 



falciferum. serpentinus [_=Harpoceras falcifemm et aff.j. 



murleyi ? Argile a poissons. 



Leptsena. Conches a Leptasna : L. moorei. L. liasiiia. TerehratuJa glohu- 



glohuliiKi.^ Una. Rhynchonella pygmxa. 



n. Si:ccEssio"S' IX THE Eaelt Pap.t of the Upper Lias of 

 iLiriNSTER (^according to Charles liloore, 1867).^ 



'boiicliardi- (6) ' Zone oi RliynciioneUa houcliardii.' 



rmirleyi.j (5) ' The Saurian and Eish Zone.' 



f{4) ' Zone oi Leptxna '_Psev.dokingena_ granulosa, Spinfera 

 ilminsterensis, and Zellania liassica.' 

 (3) 'Zone of -4Za/*i« imispinosa.' 

 -r , : ' Zone of Thecidium ■rusticum.' 



-f^^ . i (2) 'Zone of Leptsena houchardii, L. moo■rei''^ ' Terehratvla 

 (the first abundant, the second rare). I gJo})uUna. 

 (1) 'Zone of Le^jtaena bou.chardii, L. moorei' C RhynchoneUn 

 (and several other Leptsense). p. 170. J pygmsea.' 



The 

 ptse 

 Beds 



For the time when it was written this is a remarkably detailed 

 record, to our present advantage, and we may be grateful to 

 YEoore for it. But it is interestinsf to note that, althousrh he 

 gives so much detail with regard to these lower beds, he groups 

 the sixteen beds above his Saurian zone under the one term ' The 

 Upper Cephalopoda Beds,' making only one zone of the basal 

 2 inches, and leaving the rest unseparated. Yet now we have 

 those beds separated out into some eight or nine zones. There is 

 reason to suppose that the zone of BliynclioneUa houcTiardi was 

 rightly separated fi-om these by Moore, and, at any rate for record- 

 ing purposes, it should be kept distinct. Moore shows that it is 

 post-Saurian Bed— that is -^o^X- murleyi, if the Alderton Fish-Beds 



^ V. pp. 60 et seqq. 



- Vn, pp. 132. 170 et seqq. 



