Reports & Proceedings — Geological Society of London. 383 



2. "The Inferior Oolite and Contiguous Deposits of the Crewkerne 

 District (Somerset)." By Linsdall Richardson, E.E.S.E., F.GKS. 



In this communication a detailed description is given of the Inferior 

 Oolite of the Crewkerne district. 



Boughly speaking, the Upper Liassic Sands to the south-west of 

 a line connecting South Petherton, Crewkerne, and South Perrott, 

 are very similar to their equivalents in the Burton-Bradstock — 

 Beaminster-Broadwindsor district. To the north-west of that line, 

 however, limestones — largely made up of shell-debris — replace 

 a considerable portion of the yellow sands of moorei hemera, 

 " thickening " from about 18 feet at North Perrott (" Perrott Stone ") 

 to 78 feet at Ham Hill (" Biddings" and Ham Hill Building-Stone). 



In the extreme south-western portion of this district, around say 

 Drimpton, the Aalensis beds are also probably very similar to their 

 equivalents in the Burton-Bradstock — Beaminster-Broadwindsor 

 district, and at Eurzy Knaps, near Seavington St. Mary (4 miles 

 north-west of Crewkerne), what is seen of them is highly fossiliferous. 

 East of Crewkerne, however, these beds " attenuate" and " die out " 

 altogether between North Perrott and Yeovil Junction. 



The Opaliniforme beds at Broadwindsor, Whaddon Hill, and 

 Chideock Quarry Hill comprise, in descending order — 



(a) Rusty Bed ; 



(b) Very fossiliferous sandstone ; and 



(c) Sands and sandburrs. 



The equivalent of (b) is readily recognized at the Cathole Lane 

 Section, Crewkerne, where it is very rich in ammonites. Above it 

 are deposits which are with but little doubt equivalent to the Busty 

 Bed of more southern localities. East of Crewkerne, the Opaliniforme 

 beds — like the Aalensis beds — " attenuate," the lower beds 

 apparently disappearing first. , They "die out" between East 

 Chinnock and Yeovil Junction. 



The Scissum beds are 6 ft. 2 in. thick at Broadwindsor, and 

 very fossiliferous. They retain the characters exhibited at Broad- 

 windsor in the area south of the L. & S.W. Bailway ; but at North 

 Perrott, on the north, what appears to be the equivalent of their 

 lowest portion is softer and thicker. The Scissum beds also fail 

 between East Chinnock and the Junction. 



The Scissum beds are succeeded by the Ancolioeeras beds — at the 

 Conegar Hill Section, Broadwindsor, two strata, each 1 foot thick. 

 The Ancolioeeras beds extend into the Crewkerne district : they are 

 well exposed at the Misterton Lime-works and at other sections in 

 the neighbourhood, and apparently were proved in the now filled-up 

 quarry in Haselbury Plucknett village. Probably the Ancolioeeras 

 beds persist throughout the Crewkerne district. 



The upper portion of the Murchisonce beds is the main horizon for 

 Zeilleria anglica (Oppel). In the neighbourhood of Beaminster 

 specimens of this Brachiopod are very abundant. The true Zeilleria 

 angliea beds are absent from the Conegar Hill Section, but occur at 

 Drimpton, in the extreme south of the Crewkerne district, and 

 apparently were met with at Haselbury Plucknett, east of 

 Crewkerne. 



