LOWER LIAS OF ROBIN HOOD'S BAY 101 



Uptonia jamesoni (J. de C. Sowerby) (5; CA 4515-19). 



550 Shale 0.64 



Uptonia jamesoni (J. de C. Sowerby) (5; CA 4510-14), Platypleuroceras cf. brevispina (J. de C. Sowerby) 

 (3; CA 4469-71). 



Subzone of Platypleuroceras brevispina 



549 Flat sideritic mudstone nodules 0.10 



548 Shale 0.36 



Parinodiceras parinodum (Quenstedt) ( 1 ; C. 39144), Platypleuroceras brevispina (J. de C. Sowerby) 



(2; CA 4467-68), Radstockiceras sp. indet. ( 1 ; CA 3761 ). 



547 Flat sideritic mudstone nodules 0.10 



546.5 Shale, with occasional small siderite mudstone nodules in the lower part 1.02 



Platypleuroceras aureum (Simpson) (7; CA 4489-95), Platypleuroceras brevispina (J. de C. Sowerby) (2, lost), 



Polymorphites sp. indet. (1; lost). 

 546.4 Scattered sideritic mudstone nodules in shale 0.08 



Platypleuroceras brevispina (J. de C. Sowerby) (9; CA 4458-66), Platypleuroceras cf. aureum (Simpson) 



(1; CA 4488), Tragophylloceras sp. indet. (2; CA 2766-67). 

 546.3 Shale 0.23 



Platypleuroceras brevispina (J. de C. Sowerby) (11; CA 4448-57), Platypleuroceras aureum (Simpson) 



(5; CA 4483-87), Platypleuroceras sp. indet. (8; CA 4502-09), Polymorphites trivialis (Simpson) ( 1 ; CA 4396), 



Parinodiceras parinodum (Quenstedt) (1; C. 39143). 

 546.2 Sideritic mudstone nodules 0.08 



Platypleuroceras brevispina (J. de C. Sowerby) (2; CA 4446-47), Platypleuroceras aureum (Simpson) (4; CA 4479-82; 



PI. 7, fig. 6), Polymorphites trivialis (Simpson) (1; CA 4395). 

 546.1 Shale 0.33 



Platypleuroceras brevispina (J. de C. Sowerby) (10; CA 4436-45), Platypleuroceras aureum (Simpson) 



(6; CA 4473-78), Platypleuroceras sp. indet. (6; CA 4496-4501), Polymorphites trivialis (Simpson) ( 1; CA 4394). 



Flat sideritic mudstone nodules: forms a minor feature in a conspicuous gully on the scar 0.15 



Platypleuroceras brevispina (J. de C. Sowerby) (1; CA 4435). 



Shale with horizons of nodules, 4.27 m thick; forms a cambered pavement on the scar, bordered on north and south by 



conspicuous gullies; might be called the 'Polymorphites Bed'. 



Shale 0.71 



Platypleuroceras brevispina (J. de C. Sowerby) (4; CA 4431-34), Polymorphites trivialis (Simpson) (13; CA 4381-93). 



Scattered flat sideritic mudstone nodules in shale 0.10 



Polymorphites trivialis (Simpson) (3; CA 4378-80). 



Shale 0.36 



Platypleuroceras obsoleta (Simpson) (1; CA 4472), Platypleuroceras brevispina (J. de C. Sowerby) 



(38; CA 4398-4430), Polymorphites trivialis (Simpson) (3; CA 4375-77), Radstockiceras buvignieri (d'Orbigny) 



(2; CA 3749-50). 



Flat sideritic mudstone nodules 0.10 



Polymorphites trivialis (Simpson) (5; CA 4370-74), Platypleuroceras brevispina (Simpson) (1; CA 4397), 



Radstockiceras sp. indet. ( 1 ; CA 3760). 



Subzone of Polymorphites polymorphus 



Shale 0.33 



Polymorphites trivialis (Simpson) (25; CA 4347-69), Tragophylloceras cf. numismale (Quenstedt) (1; CA 2760). 



Scattered flat sideritic mudstone nodules in shale 0.10 



Polymorphites trivialis (Simpson) (20; CA 4327-46), Radstockiceras sphenonotum (Monke) (2; CA 3757-58; 

 PL 5, fig. 4), Radstockiceras sp. indet. ( 1 ; CA 3759). 



Shale, with a few grey calcareous mudstone nodules 0.93 



Polymorphites trivialis (Simpson) ( 1 1 ; CA 43 19-26; PL 7, fig. 7). 



Small grey calcareous mudstone nodules 0.08 



Shale 0.32 



Scattered flat sideritic mudstone nodules in shale 0.05 



Shale 0.40 



Tragophylloceras cf. numismale (Quenstedt) ( 1 : CA 2759). 



Small grey calcareous mudstone nodules 0.08 



Shale, with two horizons of small spherical grey calcareous mudstone nodules 0.71 



Continuous bed of sideritic mudstone; forms the northern boundary of a deep gully 0.15 



Shale 0.71 



Polymorphites caprarius (Quenstedt) (10; CA 4306-15), Radstockiceras sphenonotum (Monke) (2; CA 3755-56). 



