﻿Vol. 66.] 



JTJKASSIC STKATA OF SOUTH DOKSET. 



77 



Section III a. — Stoke Knap Building-Stone (detailed). 

 (In square brackets are names of species known to be from the Building- 



Stone, but their exact layer was not ascertained 



ipost- discitce. 



it is here suggested.) 



Thickness in feet inches. 



1st Bed. — Top bed of Building-Stone. Brown iron- 

 shot limestone. Sfepheoceras, and Oppelia of the 

 prceradiata pattern l 4 



2nd Bed. — Bluish -grey ironshot limestone. No 

 fossils except at the bottom, where there were im- 

 pressions of those in the bed below 5- 



discitcs 3rd Bed. — Yellowish ironshot limestone with (on 



top) numerous carinatitabulate Hildoceratids. 



Barellina dorsetensis, Beynesella piodes, Lopadoceras 

 arcuatam, L. euicles ; Bhynchonella forbesi, Tere- 

 bratula eudesi ; Sfepheoceras. Graphoceras sp. at 

 the bottom 7 



\_Sonninia incequa, 8. laevigata ; Depaoceras fallax, 

 Plat y graphoceras latum, PI. apertum, Eeynesia 

 laxa, (Edania lepta, Beynesella juncta, B. inops, 

 Lopadoceras furcatum, JDarellia polita, Dissoroceras 

 subomatum, StoJceia marmoreal 



4th Bed. — Greyish-yellow, hard, ironshot limestone ; 

 the iron grains being numerous, and of fair size, 



Megalytoceras confusum, Graphoceras spp 5 



concavi 5th Bed. — Similar to 4, but harder. Graphoceras 



spp. Ludwigella casta T 



[Ludwigella concava, L. tenuis, Lucya marginata, 

 Graphoceras v-scriptum.~\ 

 bradfordensis . 6th Bed. — Similar ironshot. Ammonites of Brasilia- 

 bradfordensis pattern, Graphoceras sp.; Bhyncho- 

 nella ringens; Ludwigella arcuata, L. carinata, 

 Psetidographoceras limatum 6" 



Then there is attached to the top of the bottom 

 bed, which is whitish limestone, some of this 



ironshot bed with Brasilia spp 6 



[Wiltshireia gigantea, Brasilina tutcheri, Ludwigella 



flexilis, L. rugosa, L. nodata, Vacekia stephensi, 



Zurcheria pugnax, Welschia rustica, Apedogyria 



platychora.] 



3 4 



(d) South, and North Dorset. 



Since the present communication is supplementary to that on the 

 ' Bajocian of the Sherborne District' and in part to that ' On the 

 Cotteswold, Midford, & Yeovil Sands,' it may be desirable to show 

 the comparison of the strata on the Dorset Coast with those found 

 in North Dorset; and it will be interesting to see how the chrono- 

 logical arrangement introduced for the North Dorset strata several 

 years ago can be followed out in those of the coast. 



Table III, facing p. 78, shows the comparison : some illustrative- 

 remarks are also appended. 



1 Sonninia densicostata (Monogr. p. 376), labelled ' Beaminster,' was probably 

 from Stoke Knap from the 1st or 2nd Bed; its character is of later pattern 

 than that of the discita species. Going from Stoke Knap to Beaminster, in 

 each quarry more and more of the Building-Stone is found to be denuded and 

 removed until it quite disappears ; so Stoke Knap is the likely place. 



