8 INFERIOR OOLITE AMMONITES. 



section), up above, or else equivalent to, the Upper Freestone or Oolite marl of 

 the Cotteswolds. Besides this we have some very good evidence showing the 

 identity of the Murchisonse-zone in Dorset with at any rate the Pea Grit of 

 Gloucestershire, so that there seems no reason for supposing that the Yeovil 

 Sands are of any higher horizon than those of the Cotteswolds, especially as we 

 find an extensive amount of Cotteswold Sands shown in the Stroud section. Our 

 evidence as to the identity of the Murchisona3 bed in Dorset with the Pea Grit 

 and other beds (9 — 12) in Gloucestershire is founded on the following list of 

 species which occur in both places : Harp. Murchisonce, Terebratula perovalis, Tereb. 

 Etheridgii, Tereb. simplex, Bhynch. subangulata, Bh. suhdecorata (the small kind), 

 Bh. cynocephala. I believe that this is the first time that that most characteristic 

 species Tereb. simplex has been found outside the Cotteswolds. I possess, 

 however, as many as eight fine large examples of this shell from two quarries 

 in Bradford Abbas and one near Sherborne (Dorset). The first I found were 

 submitted to Dr. Davidson, and were by him identified as undoubtedly belonging 

 to this species. 



Section at Oborne Quarry, near Sherborne, Dorset. 



Ft. In. 

 Light coloured stone 2 Parkinsoni-zone. 



Soft sandy stone 2 ") Tr . . . 



> Humpline.sianum-zone. 

 0) F 



Harder stone iron grains 3 



White marl with green grains 6 Sauzei-zone. 



Hard blue and yellow stone 2 



Several feet unseen 



y Sowerbyi-zone. 

 Soft yellow sandstone containing Bhynch. ringens at the top I 



liny 



1 



of it Uncertain , 



Section at Wyhe Quarry, near Halfway House, Sherborne, Dorset. 



Ft. In. 



Whitish stone extending up the hill, perhaps 20 Parkinsoni-zone. 



Dark red stone filled with iron 7 Humphriesianum-zone. 



Bluish stone, sometimes yellow with plenty of iron grains. ") , . 



T . ,. , tr j i Sowerbyi-zone. 



Bhynch. ringens tound in lower part 3 10 J 



Lighter yellow stone, the lower part hidden, visible 2 Murchisonse-zone. 



I have here given two sections in the Inferior Oolite which are taken from my 

 paper on "Ammonites," ' Quart. Journ. Geol. Soc.,' vol. xxxvii, p. 588, &c, 1881. 

 They are of Oborne in Dorset, and of "Wyke Quarry near Halfway House, 

 Sherborne, and I have reproduced them to show the difference that exists in the 

 beds in Dorset in a little distance, these two quarries being about five miles apart, 

 and also to show their correlation. It seems to me that the section at Oborne 

 must have very much the character of the Oolite of Normandy, while our Bradford 

 Abbas or Wyke sections are different, in fact differing as much from it as they 



