COTTESWOLD DISTRICT. 59 



of Terebratula near to globata, and especially by Nerincea Guisei, which has never 

 failed us since we entered No. 2 District. As we shall see presently, this certainly 

 represents a portion of the Clypeus-grit. The upper shelly series, measured in the 

 Profile as six feet, is in fact an accidental and extremely variable development, 

 since towards the south end of the quarry the shells of this horizon have almost 

 disappeared, whilst the highest beds of all represent a phase which is not uncommon 

 in the Cotteswolds, but which would seem to possess but little palseontological 

 interest. Altogether the Upper Ragstones are very fully developed in Horton 

 Hill Quarry. 



Travelling northwards we are able to obtain a nearly complete section of the 

 entire Inferior Oolite in the ridge which forms a continuation of Symonds Hall 

 Hill on the other side of Wootton-under-Edge. The Inferior Oolite limestones 

 are now seen to attain a considerable thickness, and the Gloucestershire Cephalo- 

 poda-bed, or zone of Am. radians, is exceedingly well developed. Above it we 

 perceive between thirty and forty feet of freestones (fine-grained oolite and 

 broken- shell rock) ; towards the middle of this there is a slight unconformity in 

 connection with a bed of Nerincea. The top of the Freestone series is bored and 

 hardened indicating unconformity to a marked extent. The whole of this 

 Freestone series belongs in all probability to the Murchisonce-zone. Above this we 

 perceive a repetition of the Horton Hill sequence, viz. that a representative of the 

 Upper Trigonia-grit rests directly on the freestones without any intervening 

 Gryphite-grit. At this place, too, Nerincea Guisei may be found in its usual posi- 

 tion in the Clypeus-grit. 



Nailswoeth Hill. — The town is about six miles east-north-east of Wootton- 

 under-Edge, and nearly twelve miles north-north-east of the exposure at Horton 

 Hill previously described. Many of Lycett's specimens, now preserved in the 

 Jermyn Street Museum, are labelled " I. 0., Nails worth Hill," though unfor- 

 tunately the horizon is never indicated. As I have myself obtained a considerable 

 number of Neringeas from this locality, I append a complete profile of the Inferior 

 Oolite of this district, mainly based upon the exposures on Scar Hill. 



The lowest beds in this section partake of the Wootton and Frocester type. 

 At the latter place Oppel 1 runs the Lias boundary (Lias-Grenze) between the 

 radians- or jurensis-zone, and the opalinus- or torulosus -zone. A few Gasteropoda 

 are obtained from this opalinus-zone in different parts of the Cotteswolds, but 

 usually their condition is not favorable to accurate determination. 



Considerable attention has been drawn to the small Gasteropods of the 

 Lower Limestone, most of which, in addition to being extremely minute, are 

 sadly rolled and defaced. Cerithium is the prevailing form. Mr. Witch ell recently 

 exhibited some of these at the Geological Society in illustration of a paper on the 



1 • Juraformation,' p. 296. 



