NOTES ON THE LIAS IN THE NEIGHBOUBHOOD OP RAD STOCK. 173- 



The fossils found in situ in each bed we have placed alongside, 

 hut we must combine the fossils obtained from several quarries in 

 order to get a view of the contents of any one bed. 



Bed (u) is recognised at once as the " Sun-bed," or top bed of 

 the White Lias. Mr. Moore has remarked on the constancy with 

 which the White Lias is found throughout the district, and as the 

 lowest Lias beds thin off sometimes, leaving higher beds reposing 

 on the Sun-bed, he has the right to claim a quasi -unconformability 

 between Lower and White Lias. The latter shows an exposure 

 of 9ft. in the present state of the quarry. 



Above we have 7^ft. of L. Lias, in which the Planorbis, 

 Bucklandi, and Karicostatus zones are represented, but not at all 

 in their usual comparative development. The Ostrea and 

 Planorbis beds are those immediately above the '' Sun-bed." 

 True, we have not found this Ammonite in siiu, but from the 

 other fossils and from the analogy between these and similar beds 

 in other sections to be referred to presently, we shall not be far 

 wrong in considering about as high as bed (1) to belong to this 

 zone. Beds (i) and (h) we place with confidence in the Buck- 

 landi zone, from the abundance of Gri/phea arcuata^ the 

 Ammonites, and other fossils in this and other quarries. This is 

 the Spiriferina Walcottii level, and this fossil is particularly 

 abundant here. Bed (h) is the same interesting mass of clay that 

 we met with in the former quarry. As it is more accessible here 

 we have added to its list of fossils, and adding up the fossils 

 found in it through the various sections, we shall get an idea of 

 the richness of its contents. The lower part of this clay especially 

 contains numerous phosphatic concretions, and the numerous 

 fossils are generally entirely filled with this phosphatic matter, 

 being found commonly as interior moulds ; the calcareous 

 investing shell is, however, occasionally preserved. 



The assemblage of fossils in this bed is also interesting. We 

 have here a passage, apparently, or a mingling of Bucklandi 

 fossils with those of higher zones. We have in this bed Am. 

 lisulcaius (several varieties), Bucklandi^ muUicostatuSy &c. ; 



