386 



SECTION OF THE SPINATUS ZONE 

 AT DOWN CLIFFS BY TOADS COVE, NEAR BRIDPOET HARBOUR, 



Contimu'd. 



Eleva- 

 tion. 



100 



No, 



LiTHOLOGT. 



Zone of Ammonites Margaritatus. 

 Bluish marl, which forms a well 

 defined band in the section. 



8 Greyish sandy laminated marls, 

 with irregular layers of nodules. 



U 



Foxy coloured sandstone with 

 from 12 to IG irregular bands of 

 stone, "The rough bed" of the 

 workmen. 



Band of crinoidal limestone. 



Grey sandy clay, in parts mic- 

 aceous. 



Band of ferruginous Septariae. 



Grey laminated sandy clay. 



The " Starfish Bed," hard grey 

 micaceous sandstone, large blocks 

 from this lie on the shore. 



Zone of Am,monites Capricornus. 



Gray Marls. 



Base of the Down Cliffs. 



Thickness 

 ft. in. 



Fossils. 



20 ... 0. 



40 ... 0. 



20 



Am. margaritatus, Am. fim- 

 briatus. Bel. elongatus, 

 Pleurotomania anglica, P. 

 expansa, Pleuromya un- 

 ioides, Pecten tequivalvis, 

 Limea acuticostata, Lima 

 Hermanni, Pinna Hart- 

 naanni, Khyn. acuta, Ehyn. 

 tetrahedra, Gryphea gi- 



Pentacrinus subangularis 



76 ... 0. 



Ophioderma Egertoni, 

 Am.fimbriatus, Am.mar- 

 garitatus, Bel. elongatus. 



Am. capricornus, Am. 

 Henleyi, Am. Bechei, 

 Am. Davsei. 



In this cliff section the Sjpmatiis bed lies immediately in 

 contact with the indurated sand of the Upper Lias, and a 

 reference to page 94 of Mr. Day's Lias of Dorsetshire, elicits 

 the observation that the appearances " point to a sea-bottom, 

 upon which, for a long period, little or no deposit took place : 

 the water-worn fragments which lie upon it, on the contrary, 

 indicating that during that period, previously formed strata 

 were again destroyed," — showing an interval previoxis to the 



