170 MR. L. TJTCHAHDSOX OX THE [vol. lxxiv, 



In the Hock Quarry (34) 1 the Sand (1 above) is seen overlying 

 some 20 feet of ' Riddings.' 



IV. Conclusion. 



In this communication a detailed description has been given of 

 the Inferior Oolite and immediately sub- and superjacent deposits 

 of the Crewkerne district. 



Roughly speaking, the Upper Liassic Sands of du mo r tier i te- 

 rn onrei hemerae south-west of a line joining South Petherton, 

 Crewkerne, and South Perrott, are very similar to their equiva- 

 lents in the Burton -Bradstock— Beaminster- Broadwindsor District. 

 North-west of that Hue, however, limestones — largely com- 

 posed of shell-debris — replace a considerable portion of the yellow 

 sand of moorei hemera, 'thickening' from about 18 feet at North 

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

 Ham-Hill Building-Stone')- 



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

 (say) Drimpton, the Aalensis Beds are probably also very similar 

 to their equivalents in the Burton-Bradstock-Eeaminster-Broad- 

 windsor district, and at Furzy 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 fail altogether between North Perrott and Yeovil 

 Junction. 



At Broadwindsor, Whaddon Hill (near Beaminster), and Chid- 

 dock Quarry Hill (near Bridport), the Opaliniforme Beds comprise, 

 in descending order — ■ 



(a) Rusty Bed, 



(b) Very fossiliferous sandstone, and 



(c) Sands and sandburrs. 



The equivalent of Bed h is readily recognized at the Cat- Hole- 

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

 Above are deposits 20 inches thick, with little doubt equivalent 

 to the Rusty Bed of more southern localities. East of Crew- 

 kerne, the Opaliniforme Beds — like the Aalensis Beds — 

 'attenuate,' the lower beds apparently disappearing first. Also, 

 like the Aalensis Beds, they fail somewhere between Crewkerne 

 and Yeovil Junction : to be more exact, between East Chinnock 

 and the Junction. 



The Scissum Beds are 6 feet 2 inches thick at Broadwindsor and 

 rich in specimens of Gryphcea cyanoides Whidborne, Lima ino- 

 ceramoides Whidborne, Volsella sowerhyana (A. d'Orbignv), etc. 

 They retain the characters exhibited at Broadwindsor in the area 

 south of the L. & S.W. Railway ; but at North Perrott — on the 



1 Not the ' Rocks ' Quarry, as it lias been previously denominated in 

 Proc. Geol. Assoc, vol. xxii (1911) p. 259 and Proc. Cotteswold Nat. F. C. 

 vol. xvii(1914)p. 113. 



