102 M.K. HOWARTH 



542.4 Scattered small dark grey calcareous mudstone nodules in shale 0.04 



Epideroceras sp. indet. (2; CA 4071-72), Polymorphites caprarius (Quenstedt) (15; CA 4292-4305), Polymorphites 

 trivialis (Simpson) ( 1 ; CA 43 18), Radstockiceras sphenonotum (Monke) (3; CA 3752-54), Tragophylloceras sp. indet. 

 (1;CA2765). 



542.3 Shale 0.33 



Polymorphites caprarius (Quenstedt) (6; CA 4286-91). 



542.2 Scattered small grey calcareous mudstone nodules in shale 0.04 



Polymorphites caprarius (Quenstedt) (5; CA 4281-85). 



542.1 Shale 0.58 



Polymorphites caprarius (Quenstedt) (8; CA 4273-80), Radstockiceras sphenonotum (Monke) (1; CA 3751). 



541 Flat sideritic mudstone nodules 0.08 



Polymorphites caprarius (Quenstedt) (4; CA 4269-72), Tragophylloceras numismale (Quenstedt) (1; CA 2758). 



540.3 Shale 0.53 



Polymorphites caprarius (Quenstedt) (11; CA 4258-68). 



540.2 Scattered sideritic mudstone nodules in shale 0.08 



Polymorphites caprarius (Quenstedt) (6; CA 4253-57). 



540.1 Shale 0.64 



Polymorphites caprarius (Quenstedt) (14; CA 4239-52), Hyperderoceras sp. indet. (1; CA 4053). 



539 Flat or spherical sideritic mudstone nodules 0.06 



Polymorphites caprarius (Quenstedt) (2; CA 4237-38; PI. 7, fig. 9). 

 538 Shale 0.81 



Polymorphites caprarius (Quenstedt) (6; CA 4231-36). 



Subzone of Phricodoceras taylori 



537 Scattered flat or spherical sideritic mudstone nodules in shale 0.08 



536 Shale 0.74 



535 Flat or spherical sideritic mudstone nodules 0.08 



534 Shale 0.86 



533 Flat sideritic mudstone nodules 0.08 



532 Shale, with occasional sideritic mudstone nodules 1.22 



531 Large flat sideritic mudstone nodules; forms the northern boundary of a gully cut by the Dungeon Hole fault 0.15 



530.3 Shale 0.91 



530.2 Grey calcareous mudstone nodules 0.05 



Phricodoceras cornutum (Simpson) (1; CA 4060). 



530.1 Shale 0.81 



Gemmellaroceras rutilans (Simpson) (2; CA 4179-80); Pinna folium (Young & Bird) abundant. 



529 Widely scattered sideritic mudstone nodules in shale; the lowest nodule bed exposed on the northern side of the 



Dungeon Hole fault 0.05 



Apoderoceras sp. indet. (1; CA 4052). 

 528 Shale 0.81 



Gemmellaroceras sp. indet. (1; CA 4194). 

 527 Continuous bed of sideritic mudstone; weathers red-brown, and is yellow-brown when broken; a distinctive bed forming 



a scarp face on the northern boundary of a gully 0.18 



PYRITOUS SHALE MEMBER 



526.7 Shale, with occasional masses of pyrites, and a few calcareous mudstone nodules 1 .57 



Apoderoceras sp. indet. ( 1 ; CA 405 1 ), Tragophylloceras sp. indet. ( 1 ; CA 2764). 

 526.6 Septarian calcareous mudstone nodules 0.10 



Apoderoceras cf. aculeatum (Simpson) (4: CA 4032-35). 



526.5 Shale, with occasional masses of pyrites, and a few calcareous mudstone nodules 1.02 



Apoderoceras aculeatum (Simpson) (3; CA 4029-31; PI. 6, fig. 2). 



526.4 Calcareous mudstone nodules 0.06 



Apoderoceras sp. indet. (2; CA 4049-50). 



526.3 Shale, with many masses of pyrites and 'nests' of pyrites with a radiating structure 0.25 



Apoderoceras cf. aculeatum (Simpson) (1; CA 4028). 



526.2 Calcareous mudstone nodules, some with circular septarian jointing 0.05 



Apoderoceras cf. aculeatum (Simpson) (1; CA 4027). 



526.1 Shale, with a few 'nests' of pyrites, and some calcareous mudstone nodules, especially in the lower part 1.32 



Phricodoceras cornutum (Simpson) (5; CA 4055-59). Gemmellaroceas rutilans (Simpson) (2; CA 4177-78; PI. 7. 

 fig. 4), Apoderoceras aculeatum (Simpson) (3; CA 4024-26), Apoderoceras sp. indet. ( 1 ; CA 4048). 



525 Large flat sideritic mudstone nodules, with a very irregular top surface which weathers dark red; a very conspicuous bed 



crossing the scar south of the Dungeon Hole fault (see bed 520.4) 0.10 



