90 



M.K. HOWARTH 



Fig. 9 Details of the outcrops of beds 475^4-94 in the bed of Mill Beck from the mouth of the beck up to the weir west of Bay Mill. 



Fig. 10 The seaward face of The Nab immediately north of the mouth of Mill Beck. M.K. Howarth photograph. 1 1 September 1991. The beds here are the 

 middle part of the Siliceous Shale Member and belong to the Oxynotum to basal Raricostatoides Subzones; the main beds are identified on the right hand 

 side of the photograph. 



