148 MR. L. RICHARDSON ON THE [vol. lxXlV, 



to Broadwindsor, the highest limestone of the Inferior Oolite is a 

 thin bed with a bluish centre, often rubbly, and readily recognized. 

 It is the ' Zigzag Bed,' and — as its name implies — is of zigzag 

 hemera. The bed extends into the Crewkerne district, and has 

 been observed in its typical condition as far north as Haselbury - 

 Mill Quarry (30), 1 Haselbury Plucknett. 2 



The Zigzag Bed is succeeded by ' The Scrotf,' which has been 

 dated as f usees hemera. The Scroff contains the little brachiopod 

 Aulacotliyris cucullata S. Buckman, 3 and — like the Zigzag Bed — 

 extends into the Crewkerne district. J. F. Walker appears to 

 have discovered the characteristic little brachiopod (Aulacotliyris 

 cucullata) in the quany (9), near Misterton Church, for he has 

 written — 



4 in a quarry near the Church at Misterton, near Crewkerne, I found a band 

 of clay [The Scroff] lying on the top of the Inferior Oolite stone, containing' 

 numerous specimens of a variety of Waldheimia meriana associated with 

 T. decipiens: (Proc. Dorset Nat. Hist. & Ant. F. C. vol. iii, 1879, p. 46.) 



Fuller's Earth is to be observed in an opening near Slade's 

 •Quarry at North Perrott (2S), and at the Haselbury-Mill Quarry 

 (30). Higher deposits have been dug for brick-making near the 

 tunnel about a mile west of Crewkerne Station ; at LYve's brickyard 

 south-east of the brewery at Crewkerne (19) 4 ; and at East-Cross 

 Hill (32) 5 between Haselbuiy and East Chinnock. 



II. Subdivisions recognizable in the Inferior Oolite 

 of the Crewkerne District. 



The subdivisions recognizable in the Inferior Oolite of this 

 district will be seen on reference to the folding table (facing p. 170), 

 from which also an idea will be obtained of their geographical 

 distribution and thicknesses. 



(xxvii) Aalensis Beds. — The Aalensis Beds are well developed 

 (29 feet 8 inches) and very satisfactorily exposed at Chideock- 

 Quarry Hill, near Bridport (Dorset). 6 



In the Crewkerne district there is an exposure of a portion of 

 the Aalensis Beds in the bank by the roadside (23) at Furzy 

 Knaps, near Seavington St. Mary — a village 4 miles north-west of 

 Crewkerne. The deposits here are very fossiliferous, and have 

 yielded to me ? 7 Canavarina venustula S. Buckman, Pleydellia 



1 The numbers in parentheses refer to the corresponding numbers on the 

 map (%. 1, p. 146). 



2 On the old Ordnance Survey map the name is given as ' Haselbury ' only 



3 Q. J. G. S. vol. lxvi (1910) p. 102 & pi. xii, figs. 1-2. 



4 H. B. Woodward, ' The Jurassic Rocks of Britain, vol. iv — The Lower 

 Oolitic Bocks of England (Yorkshire excepted) ' Mem. Geol. Surv. 1894, 

 p. 67. 



5 Ibid. p. 235. Woodward gives the name of the hill as High Cross Hill, 

 but it is called East Cross Hill on the current 6-inch map. 



<; S. S. Buckman, Q.J. G. S. vol. lxvi (1910) p. 64. 



7 In this paper the note of interrogation is placed before the name of the 

 genus, species, subdivision, or hemera that it queries. 



