110 M.K. HOWARTH 



431.1 Shale, with a few thin lenses of limestone in the upper part 0.30 



430 Hard, pyritous, shelly, grey limestone, weathering yellow-brown 0.08 



Arnioceras sp. indet. (1; lost). 



429.8 Shale, with 0.06 m thick calcareous mudstone nodules in the top half 0.15 



429.7 Flat lenses of hard, grey, crystalline limestone 0.03 



Zone of Arnioceras semicostatum 

 Subzone of Euagassiceras sauzeanum 



429.64 Grey calcareous mudstone nodules 0.05 



Arnioceras semicostatum (Young & Bird) (1; CA 2913), Coroniceras (Arietites) alcinoe (Reynes) (2; CA 2803-04; 



PL l.fig. 8). 



429.63 Shale, with thin lenses of shaly limestone, especially at the top of the lower third 0.61 



429.62 Occasional grey calcareous mudstone nodules in shale 0.05 



Arnioceras semicostatum (Young & Bird) (4; CA 2909-12). 

 429.61 Shale, with small sideritic mudstone nodules, and occasional much larger 'cheese' doggers up to 2 m diameter 0.61 



Arnioceras semicostatum (Young & Bird) (2; CA 2907-08). 



429.5 Grey limestone, shaly in places, weathering yellow-brown, with small nodules on its upper surface 0.08 



429.4 Shale, containing many small grey calcareous mudstone nodules 0.08 



Arnioceras semicostatum (Young & Bird) (1; lost). 



429.3 Shale, with very occasional calcareous mudstone nodules 0.36 



429.2 Thin continuous or nodular grey limestone, shaly in places 0.03 



429.1 Shale 0.18 



Arnioceras obliquecostatum (Zieten) ( 1 ; lost), Arnioceras sp. indet. (2; CA 2935-36). 



428 Shale, with lenses or a continuous band of grey shaly limestone in the top third, and calcareous mudstone nodules in 



the lower third 0.15 



Arnioceras semicostatum (Young & Bird) (5; CA 2902-06). 



427.3 Shale 0.38 



Arnioceras semicostatum (Young & Bird) (4; CA 2898-2901). 



427.2 Irregular band of hard grey shaly limestone, weathering brown 0.15 



Arnioceras semicostatum (Young & Bird) (4; CA 2895-97), Coroniceras (Arietites) sp. indet. (1; CA 2805). 



427.1 Shale, with some lenses of shaly limestone, and a few large 'cheese' doggers of sideritic mudstone 0.71 



Arnioceras sp. indet. ( 1 ; CA 2934). 



426.2 Hard grey shaly limestone, weathering brown, with a rough top surface; forms a conspicuous scar landward of Pseudo 



Low Balk (bed 424.2); many Gryphaea 0.05 



Coroniceras [Arietites) alcinoe (Reynes) (1; CA 2802), Arnioceras semicostatum (Young & Bird) (10; CA 2885-94), 

 Arnioceras sp. indet. (1; CA 2933). 



426.1 Hard calcified shale, weathering brown 0.15 



Arnioceras semicostatum (Young & Bird) (3; CA 2882-84), Euagassiceras sp. indet. (1; CA 2973). 



425.7 Shale, with a few indurated patches 0.15 



425.6 Grey calcified shale, weathering brown 0.11 



Arnioceras semicostatum (Young & Bird) (9; CA 2873-81). 



425.5 Shale; very occasional large calcareous mudstone 'cheese' doggers 0.15 



Arnioceras semicostatum (Young & Bird) (16; CA 2857-72), Arnioceras miserabile (Quenstedt) (2; CA 2919-20). 



425.4 Grey calcified shale, weathering brown 0.1 1 



Arnioceras sp. indet. ( 1 ; CA 2932). 



425.3 Shale 0.15 



Arnioceras sp. indet. (1; CA 2931). 



425.2 Grey calcified shale, weathering brown 0.1 1 



Arnioceras sp. indet. ( 1 ; CA 2930). 



425.1 Shale, with a few indurated patches 0.52 



Euagassiceras sp. indet. (2; CA 2971-72), Arnioceras sp. indet. (11; CA 2921-29). 



424.3 Calcified shale, harder in the upper half; occasional small calcareous mudstone nodules 0.61 



Euagassiceras sp. indet. (3; CA 2968-70), Arnioceras semicostatum (Young & Bird) (18; CA 2839-56), Arnioceras 

 miserabile (Quenstedt) (3; CA 2916-18), Coroniceras (Arietites) alcinoe (Reynes) (1; C.41310). 



424.2 Shale, partially calcified in the top half; this middle division of bed 424 forms the scar 'Pseudo Low Balk' which 



emerges immediately landward of Low Balk (bed 422.2) 0.30 



Arnioceras semicostatum (Young & Bird) (10; CA 2829-38; PI. 1, fig. 2), Arnioceras miserabile (Quenstedt) 

 (2; CA 2914-15). 



424.1 Shale, partially calcified near the top 0.61 



423 Shale, no subdivisions observed 1.58 



422.2 Hard blue-grey flaggy limestone, weathering brown, with a rough top surface; slightly micaceous; forms the capping of 



