164 



INFERIOR OOLITE AMMONITES. 



Dorset- Somerset district has enabled this correlation to be undertaken with 

 certainty.^ 



The following sections will exhibit this more minute mode of division founded 

 solely upon the occurrence of the Ammonites ; and they will also show the different 

 lithological conditions which belong to the same palseontological horizon. The 

 different positions which the same species occupy in different districts with relation 

 to deposits of yellow sands is a point of importance. 



X. 8ection in Buckholt Wood {ten and a half miles from Gloucester, 



by ivest). 



Moorei-hediS. 1. Brownish stone, darker brown grains. Dumortieria Moorei (Lycett), 

 Gramm. mactra (Dumortier), Rh. cynocephala, Tereb. haresfieldensis 



2. Dark-grey and sometimes brownish stone with dark-brown grains. Dum 

 radians (Rein.), Wiynch. cynocephala, Tereb. haresfieldensis . 



3. Reddish-yellow sticky marl ; in places numerous Belemnites 



4. Dark-grey, ironshot stone, soft, breaking up into shales. Oramm. dis 

 pansum, Hamm. insigne .... 



5. Marl ...... 



6. Light-yellow soft stone. Qramm. dcerntense, Oramm. striatulum 



7. Brownish marl, numerous dark-brown grains. Gramm. Cotteswoldice 



8. Yellowish stone. Gramm. striatulum, Haugia Eseri . 



9. Rounded lumps and irregular masses of blue-hearted sandstone, the inter 

 stices and cavities filled with bed above . 



10. Tellow sands (Cotteswold Sands) , 



Dumortieria- 



beds. 



Dispansum- 

 beds. 



Striatulum- 

 beds. 



Variabilis- 

 beds. 



south 



Ft. In. 



1 9 



2 











6 



1 











2 







9 







7 







6 



1 3 



Opalinum- 

 bedsi. 



Moorei-heA». 



Dumortieria- 

 beds. 



Dispansum- 

 beds. 



Striaiiilum- 

 beds. 



XI. Section at Little Soclhury {eleven miles north of Bath). 



1. Whitish limestone with white grains . . . . 



2. Straw-coloured, shelly, sandy limestone . . . about 



3. Reddish-brown, very hard, ironshot limestone . . about 



4. Greyish, much ironshot marl ; in some places softer, in others harder. 



Rhynch. cynocephala, Dumortieria Moorei 



5. Darker, soft mudstone, much ironshot. Dumortieria radians, Rhynch 



cynocephala, Cheninitzia procera 



6. Grey ironshot marl ..... 



7. Grey sandstone, Lytoc. Germaini (fragment) 



8. Teilow and grey micaceous sands 

 ■ 9. Hard yellowish, somewhat ironshot stone. Gramm. striatulum . 



10. Grey marl ...... 



11. Much ironshot marl and mudstone. Gramm. Gottesiooldics 



t 2 







t 1 







. 4 



6 



. 2 



6 



. 3 











4 



. 8 







. 



10 



. 1 



2 



. 



8 



^ " The Cotteswold, Midford, and Yeovil Sands," ' Quart. Journ. Geo!. Soc.,' vol. xlv, pp. 440—474, 



1889. 



