ZONE OF AMALTHEUS MARGARITATUS. 



97 



which are limited to the Yorkshire series, as TJraster carinatus, Wr., Astropecfen 

 HastivffsicB, Forb., Ophioderma Milleri, Phil., Aspidura loricata. Will., and Opidura 

 Murravii, Eorb., all collected from the Marlstone series near Staithes, where one of the 

 most instructive sections of the Jlmyarifatus-heds is exposed in the cliif. The following 

 section, by Messrs. Tate and Blake,^ has more detail than mine, so I have selected it. 



Section of the Margaritatus-^e^s at Staithes. 



Thick- 

 ness. 



Organic Rem.^ins. 



Zone of Amaltheus spinatus. 



Bottom seam of impure ironstone : shells 

 enveloped in a calcareous matrix ... 



Blue marly shale ; top surface i 

 crowded with Belemnites i 



Blue shale j 



Fine-grained argillaceous limestone ... 



Blue shale 



Band of clay-ironstoue, slightly spec- 

 kled with white grains ; forms a scar 

 on the flat shore 



Black splintering shale 



Oval argillaceous limestone doggers \ 



Black splintery shale ) 



Clay-ironstone in two blocks, weather- 

 ing brick-red 



Shale 



Argillaceous limestone dogger 



Shale 



Small doggers 



Shell-bed 



Sandy shale with scattered doggers ... 



Blue, with doggers and shell masses ... 



Shale, with doggers and shell-masses... 



Dogger band 



Marly shale 



Sandy shale and doggers 



Calcilerous sandstone 



Sandy marls 



Dogger band 



Sandy marls 



Blue limestone 



Striped sandy sliales, with fossililerous 



doggers and their sandstones 



Keddish sandstone with bands of fossils 

 Grey sandstone and flags, false bedded 



Calciferous sandstones 



Soft marly sandstone and calciferous 



sandstone bands 



ft. in. 



4 3 







1 



5 



5 







10 



9 



8 



5 



4 



2 







I 











8 







2 







1 







1 



2 



11 



c 







10 











4 



8 







7 











3 



2 



9 







3 



2 







1 







17 



2 



2 



6 



6 



6 



6 



2 



4 



Amal. margaritatus, Belemnites, Pecten aquivalvis, 



Gryphcea cymhium, Cypricardia ciicullata. 

 Amal. m,argantatus, Belemnites, Pecten (Bqidvalvis, 

 fossil Wood. 



Amal. margaritatus, Protocardium tnincutum, 

 Monotis cygnipes. 



Amal. margaritatus, Gryphcea cymbiiim, Protocar- 

 cardiwn truncatum. 



Gryphcea cymbium. 



Belemnites and oysters. 

 Gresslya Seebachii. 



Gresslya Seebachii, Protocard, truncatum, Pecten 

 cequivalvis, Macrodon intermedius. 



Amal. margaritatus, A. Capricornus, and many 

 other fossils. 



GresslycB. 



Amal. margaritatus, Chemnitsia Blainvillei, Proto- 

 cardium truncatum. 



Bentalium giganteum, Protocardium truncatum, 

 Lima Hermanni, Monotis cygnipes, &c. 



At the base of the cliff, on the south side of the harbour, the following lower 

 beds are exposed at low tide. 



1 ' Yorkshire Lias,' p. 107. 



13 



