﻿Vol. 66.] 



JTJR1SSIC STRATA OF SOUTH DORSET. 



71 



a latesulcate periphery, known as a species from the niortensis beds 

 of Louse Hill near Sherborne. 



This evidence then, although not satisfactory, would date the 

 deposit as niortensis, or as late niortensis early Garantiance hemera : 

 it would make the deposit of the same date as the upper part of 

 the Red Bed, and earlier than the Astarte Bed ; but how it happens 



Fig. 5. — Vertical section of the beds exposed at Burton Bradstock. 

 (See pp. 72 et seqq.) 



Zigzag 



Schlosnb. 



Truellii ' 

 Car ant. 



mort. 



I - 

 Witch. 



Discitse 

 etc. 



Scissum 



Opaliniformis 





Aalensis 



1st. Bed 



2nd. Bed 



3rd. Bed 



4th. Bedl 

 Red Bed/ ' 



l^ "Snuff-boxes 

 yellow conglom 



Bottom bed 



Rusty Bed 



Sandstone 

 bed 



yellow sands 



sandstone 



sands &sand 

 burrs 



ASSESS ««*.*«- 



> stout Parkinsonian 



stout Parkinsonian 



"1 Tcreb. sphxroidalis 

 >Park parkinsoni 

 \ Strigoceras truellii 

 } Evolute Parkinsoni x 



Perisphinctes 

 I Stcpheoceras 

 [ Poecilomorphus 

 I Sonninia 



Carinati-tabulate Hildoceratids 



Tmctoccras scissum 



Lioceras.Burtonia 



^ Canavarclla, Zeilleria oppeli 

 >opalinoids 



Canavarina <£ 

 aalensis 



Ammonites 



Alocolytoceras 

 wrigjitt 



Scale: I inch 

 5 millimetres = 



that so distinct a deposit should have been formed at the same 

 time as the Eed Bed at this one place, and not at the others, is 

 certainly a puzzle. There is one section a quarter of a mile north 

 (Larkfleld Quarry), another section a quarter of a mile north-west 

 (road-cutting to Burton village), and the cliff-section a quarter to 

 half a mile westward of this exposure of the White Bed ; and yet 

 in these short distances there is practically no sign of any deposit 

 of a thick white bed of the character of the one that has just been 

 described. 



