Geological Society. 327 



PROCEEDINGS OF LEAR2TED SOCIETIES. 



GEOLOGICAL SOCIETY. 



June 20th, 1917.— Dr. Alfred Ilarker, E.Il.S., President, 

 in the Chair. 



The following corainunicatiou was read : — 



' The Inferior Oolite and Contiguous Deposits of the Crew- 

 kerne Disti'ict (Somerset).' By Linsdali Richardson, F.R.S.E., 

 F.G.S. 



In this communication a detailed description is given of the 

 Inferior Oolite of the Crewkerne District. 



Roughly 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-Broad Windsor 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 moovei hemera, 

 'thickening' from about 18 feet at North Perrott ('PeiTott 

 Stone') to 78 feet at Ham HiU (' Riddings ' and Ham-Hill 

 Building-Stone). 



In the esti-eme 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-Broad- 

 Avindsor District, and at Furzy Knaps, near Seavington St. Mary 

 (■1 miles north-west of Crewkerne), what is seen of them is 

 highly fossiliferous. East of Ci-ewkerne, however, these beds 

 'attenuate' and 'die out' altogether between North Perrott and 

 Yeovil Junction. 



The Oj) (din if or me Beds at Broad windsor, Whaddon HiU, and 

 Chideock- Quarry Hill comprise, in descending order, — 



(a) Eusty Bed ; 



(6) Very fossiliferoiis sandstone ; and 



(c) Sands and sandburrs. 



The equivalent of (h) 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 Rusty 

 Bed of more southern localities. East of Crewkerne, the Opalini- 

 forme Beds — like the Aalensis Beds — 'attenuate,' the lower beds 

 apparently disappearing first. They ' die out ' between East 

 Chinnock and Yeovil Junction. 



