LOWER LIAS OF ROBIN HOOD'S BAY 



97 



Fig. 17 Map showing contours at 10 m bed thickness intervals in the Lower Lias on the foreshore of Robin Hood's Bay, from which the elongated dome 

 geological structure can be deduced. The only geographical features shown are the line of the base of the cliff and the low tide mark. See text for further 

 explanation. 



STAITHES SANDSTONE FORMATION (PART) 



Bed no 



601.2 



601.1 



600.13 



600.12 



600.11 



600.10 



600.9 



600.8 



600.7 



600.6 



Zone of Amaltheus margahtatus 

 Subzone of Amaltheus stokesi (lower part) 



m 



Sandstone, soft, micaceous, laminated 0.66 



Sandstone, hard, shelly in parts; many Gryphaea sp.; forms the roof of Castle Chamber at north-west end of Robin 



Hood's Bay 0.81 



Sandstone, soft, silty 0.33 



Shale, silty 0.38 



Limestone nodules 0.10 



Shale, silty 0.08 



Shale, sandy 0.38 



Shale, silty, with horizon of limestone nodules near top 0.53 



Amaltheus stokesi (J. Sowerby) 0.3 m above base ( 1 ; CA 4605) 



Shale, sandy, laminated; forms the most conspicuous positive feature between floor and roof of Castle Chamber 0.25 



Flat limestone nodules 0.13 



Amaltheus stokesi (J. Sowerby) (1; MKH Coll, lost). 



