680 MESSES. S. S. BUCEMAN AND E. WILSON fNoV. 1 896, 



Bed 5 of this section is the same as that numbered 3 in the 

 Clements' Yard exposure. Between it and the Freestone there is 

 very probably some representative of Beds 1 & 2 of Clements' 

 Yard ; the inaccessibility of the fissure prevented accurate deter- 

 mination in this matter. But the point to be noticed is that the 

 beds of the Sonninice hemera are not capped by any representative 

 of the Ironshot Oolite, either here or at Clements' Yard. 



The thick freestone-beds Nos. 3 & 4, especially the latter, yield a 

 stone of considerable economic importance ; they are capped by 

 a few feet of coralliferous stone and marl which we have termed 

 the ' Coralline Beds.' Several species of corals have been obtained 

 from these deposits, as well as many specimens of Zeilleria Waltoni, 

 and, less plentifully, Aulacothyris carinata, Bhynchonella i plicatella i 

 Bh. subtetraedra ; and from the same bed elsewhere Acanthothyris 

 panacantliina rarely. These brachiopods seem to indicate that the 

 Coralline Beds were contemporaneous with the ' top beds ' of Broad 

 Windsor, yielding ' Stephanoceras zigzag.' If that be so, the Dundry 

 freestone would be equivalent to the * Fossil Bed ' of Halfway 

 House, Dorset, which yields Strigoceras Truellii and Parkinsonia 

 clorsetensis, in which case the date of the deposition of the Freestone 

 would be Truellii hemera. 1 



The next section is one of the best known at Dundry ; it is on 

 the eastern side of the main road, on the northern flank of the hill, 

 not far from the ' Butchers' Arms.' 



Section IV. — The Northern Main-road Quarry, near the 

 ' Butchers' Arms.* 



ft. ins. ft. ins. 



Coralline 1. Kubble and soil about 3 



Beds. 2. Grey, crystalline, lenticularly-bed- 



ded, coralline limestone. Many 



corals 2 6 



3. Greenish clay with dark crystalline 

 limestone. Zeilleria Waltoni, 

 Terebraiula sp. no v., Acantho- 

 thyris panacanthina, and a num- 

 ber of micro-brachiopoda 2 



4 6 



Equivalent 4. Whitish, regularly and thinly- 

 op Dundry bedded, compact limestones with 



Fkeestone. small iron specks. (The top bed 



bored.) 4 



Sauzei. 5. Yellowish-brown ironshot lime- 



stone — the well-known f ossi- 

 ferous horizon. ' Stephanoceras'' 

 Sauzei, Sonninia Sowerbyi, S. 

 corrugata; many 'mammillate' 

 Sonninice ; Stephanocerata of the 

 Baylea?ium-tj^>e ; Acanthothyris 

 paucispina; Ter ebratu la sp. ; nu- 

 merous lamellibranchs, such as 



1 See 'The Bajocian of the Sherborne District,' Quart. Journ. Geol. Soc. 

 vol. xlix. (1893) p. 487. 



