﻿Vol. 66.~\ JURASSIC STRATA OF SOUTH DORSET. 73 



Tkic/cness in feet inches. 

 bottom, sometimes almost white 

 with greenish grains. Masses of 

 rather small Terehratula sphceroi- 

 dalis j nst above the bottom. Large 

 Parkinsonia dorsetensis, P. parkin- 

 soni, etc., in excellent condition, 

 Strigoceras truellii, Nautilus spp., 

 and Crassineila \Astarte~\ ohliqua. 

 These are the most noticeable 

 fossils. Others are : Morphoceras 

 dimorphum, M. defrancii, Cado~ 

 moceras cadomense, Cadomites dau- 

 benyi (Geram.); Polyplectites spp. 

 Tar., Lissoceras psdodiscum 

 (Schlcenb.), L. monachum (G emm). ; 



Acanthothyris panacanthina 1 10 



•Garantiance... (4) At base of 3rd Eed is the Shell Bed 

 or Astarte Bed, Hudleston's P.l 

 in part — a soft brownish iron shot. 

 Contains numerous Crassineila oh- 

 liqua and flat evolute Parkinsonia, 

 Perisphinctes of the P.-martiusi 

 type ; Ancyloceras ; Garantiana 

 spp.; occasional T. ' sphcsroidcdis.' 

 Derived fossils like Stepheoceras 



umbilicus 4 



niortensis, (5) The 4th Bed, or Pink Bed, or 



blagdeni, Red Bed of the qnarrymen. A hard, 



sauzei, fine-grained, ironshot, somewhat 



WitchellicB. crystalline limestone, particularly 



massive. The top is very irre- 

 gular, and portions of the shell- 

 bed lie in hollows. The fossils 

 represent various dates : they are 

 mostly derived, and covered with 

 limonitic layers. In the lower 

 9 inches there is more coarse 

 ironshot, irregular; it is coarser 

 towards the bottom. Mixed with 

 it are large limonitic concretions 

 called by the workmen snuff- 

 boxes, with much-bored pieces of 

 Myoconcha, Ctenostreon, etc., and 

 bits of stone as nuclei. Fossils of 

 the Red Bed, at the top, were Peri- 

 sphinctes sp., of niortensis date ; 

 Stepheoceras umbilicus, of blay- 

 deni date ; Skirroceras cf. macrum, 



sauzei Hate 2 10 



Other species from this bed are : — 

 Blagdeni date : Pcecilomorphis cy- 



cloides. 

 Sauzei date: Stepheoceras frey- 



cineti, St. hayleanum, Sonniuia, cf. 



patella ; Acanthothyris paucispin a. 

 WitchellifB date : Witchellia sp. 

 There is a rare, but very charac- 

 teristic, rather large Terehratula. 



hurtonensis, sp. nov. (see the palae- 



ontological paper, p. 99). which is 



probably of sauzei date. 



