I *.-,!). i 



WRIGUT INFERIOR OOLITE. 



47 



Near Bath, as at "Widcombe Hill, the Inferior Oolite is represented 

 chiefly by the upper subdivision of this formation. Not having ex- 

 amined this section, I cannot state whether the middle subdivision 

 is likewise present ; and unfortunately the determination of the spe- 

 cies in Mr. Lonsdale's valuable memoir is not sufficiently precise to 

 enable me to form an opinion thereon. 



In the Yeovil district of Somerset, as I have already stated, the 

 Humphriesianus-beds arc overlain by light-coloured oolitic lime- 

 stones, containing Ammonites ParJcinsoni, and also shells character- 

 istic of the upper subdivision of the Inferior Oolite, as shown in tho 

 section at Hall-way House, to which the reader is referred (p. 35). 



C. In the neighbourhood of Bridport, Dorset, the Parkinsoni-zone 

 is well developed, and fully exposed in several instructive sections, 

 as at Walditoh Hill and Chidcock Hill, near Bridport, and on the 

 Down between Bridport Harbour and Burton Bradstock. The quarries 

 on the hill were formerly worked for road-stone ; but in consequence 

 of the railroad having brought chalk-flints into the neighbourhood, 

 the oolite has fallen into disuse. The following section represents, in 

 descending order, the beds exposed near Burton Bradstock. 



Section afforded by the Quarries in the Zone of Ammonites Parkinsoni 

 near Burton Bradstock. 



'a. A coarse, ferruginous, ironshot oolite, con- 

 taining many fossils : Ammonites Parkinsoni, 

 A. TrueUei, A. sidn-adiutus, Ancyloceras an- 



nulatum, Astart< obliqua 



Zone of 6. Thin-bedded oolitic limestone, with few 



Ammonites < fossils 



Parkinsoni. c. Brachiopoda-bed ; a rich shelly oolite, con- 

 taining immense numbers of T< /•- bratula 

 sjj//h -rnidfdis 



'/. Thin-bedded oolitic limestone; few fossils. 



ft. in 



3 



1 6 



1 



I 



^e. Coarse brown oolitic limestone 2 



Fossils frm, tin Burton Bradstock Quarries (Parkinsoni-zone). 



Ammonites Parkinsoni, 



Murtinsii, tPOrb. 



Tni.-llci, tPOrb. 



Bobradiatus, Sow. 



Nautilus lim-utus, ,K,ir. 

 Ijclrinnitvs L'itianU'Us, Schlufh. 

 Cfinulirulatus, Sohioth. 



Pleorotomaria Proteus, Dedong. 

 Pnrporina ornate, Bow. 

 Astarte obliqua, Lank. 



Bobtngona, Mil/rutt. 



Modiola ooneate, 



Lima Bemioironlaria, a<'i<ij. 



pn >1 m >s<-ii It-.-i, Sow. 



Pholaaomya Eferaulti, 

 Plenromya Juraasi, Br 



Bbynohonella spinosa, Sehioth, 



plicatella, Sow. 



Terebratula iphssroidalis, Sow. 



l'liillipsii. Mor. 



Clypeus Aga^si/ii, J>>. 



altu-, M i 



lypna Dbberolns, Ag. 

 Stomecnmua mgrannlaris, Lamk, 

 Oidaris Bouohardii, Wr. 

 Holectjpus lieiuispliaric i 



Oollyntea ringens, Dstn. 



oval is. Lake. 



Muutiivaliia troohoidee, /" ' < f Bu rnt , 



Delabeohei, Edw, .i II 



Troahooyathua IfagnenUianua, Mi< hot, 

 Discooyntlms Ended, Bfickti. 



