﻿Vol. 66.'] JTJEASSIC STEATA OF SOT7TE DOESET. 75 



of Burton and the Red Beds or Building-Stone of Chideock are only 

 partly on the same horizon, while they differ in lithic character very 

 considerably. The beds yielding fossils of Witchellice and sauzei 

 date are well developed at Chideock, and are rich in specimens ; 

 they are poorly developed at Burton. At Chideock, however, there 

 are no strata yielding species of blagdeni-niortensis dates. The 

 Astarte Bed {Garantiance) is not found at Chideock. In regard to 

 the Top Beds, neither the truellii bed nor the zigzag bed have been 

 noted at Chideock, where the mass of limestone seems to belong to 

 the position of the 2nd Bed and the lower part of the 1st Bed of 

 Burton (schlambachi). 



(b) Other South Dorset Sections. 



The general type of the Burton Bradstock Inferior Oolite will 

 be found reproduced, with variation of detail in quarries inland, 

 bordering the main road from Bridport to Dorchester. One of these 

 quarries, Vetney (or Vinney) Cross, shows the Astarte Bed thicker, 

 and an excellent repository of well-preserved fossils. Farther inland, 

 around Beaminster, the c Top Beds ' are found resting on deposits of 

 different dates — on those of covcavi, or bradfordensis, or murchisonce, 

 according to the quarry. At Broad Windsor the Top Beds rest on 

 strata of murchisonce date in the road- cutting, where the sequence 

 into the sands might be profitably investigated with regard to 

 modern divisions : old notes are not sufficiently detailed. 



The Grange quarry at Broad Windsor has produced a remarkable 

 series of fossils, mostly from the zigzag and schloenbaclii horizons ; 

 but the strata of truellii date are to be seen. 



Between Broad Windsor and Beaminster. however, is a locality 

 which shows a very much more complete sequence than any other 

 in South Dorset, so far as Bajocian-Aalenian beds are concerned. It 

 is Stoke Knap, and deserves some notice. 



* 



(c) Whaddon Hill, or Stoke Knap. 



About 6 miles north of Bridport, and about 7 miles to the 

 northward of Down Cliff, is the locality marked on the Ordnance 

 Survey map as Stoke Knap, known to the natives as Whaddon Hill. 

 It is about midway between Beaminster and Broad Windsor, and is- 

 of interest for the development of strata of bradfordensis to diseitce 

 hemera, which yield a profusion of specimens in excellent condition. 

 The bed in which they occur is known as the Building-Stone ; and 

 some years ago, when I was visiting the locality, the workmen took 

 off the bed for me layer by layer, so that it was possible to collect each 

 species in situ, and note the change of fauna in one bed. 



Mr. H. B. Woodward, F.R,.S., has published a section of Stoke 

 Knap. 1 Though it is not detailed enough for my purpose, and he 

 has not numbered his beds, it may usefully be compared with the 

 workmen's divisions and with my dating system. 



1 ' Jurassic Rocks of Britain : vol. iv — The Lower Oolitic Rocks of England* 

 Mem. Gteol. Surv. 1894, p. 03. 



