106 



THE LIAS AMMONITES. 



examined on five different occasions, have presented some local differences, partly laid 

 bare in the working, partly by waste of the coast." The alternations of shale and iron- 

 stone, with sandy shale forming the Ironstone series or Spinatus-heds, and the laminated 

 sandstone shale, with occasional ironstone balls, forming the Marlstone series or 

 Mar^aritatus-heds, are well seen in this section, which is intended to give a fair average 

 idea of the whole when made in 1867. 



Fig. 4. — Section east of Staithes Harbour, Yorkshire Coast. 



Ft. In. 



Ironstone Series 



or 

 Spinatus-heis 



Marlstone Series 



Hard-bed shale 

 Ironstone... 



Shale 



Ironstone, with shale 

 partings andfive iron- 

 stone beds in shale . 



Ironstone ... 



Shale 

 Ironstone... 



Sandy shale 



Ironstone ... 



Sandy shale, with five 

 bands of scattered 

 ironstone nodules ... 



Laminated sandstone 

 and shale, with occa- 

 sional ironstone balls 



Sandstone more solid, 

 and forming scar and 

 part of cliff east of 

 Staithes Harbour ... 



Pecten cequivalvii. 



Beleranite-beds. 

 Pecten calvut. 



}• Few Belemnites. 



2' 3" 



1' 6" 



4' 6" 



5' 6" 



2' 0' 



1' 3" 



7' 0""^ 



2' 0" I 



10' 0" 



2' 0"J 



25' 0" Protocardium truncatum. 



Belemnites near the base. 



Gryphcea cymbium. 

 20' 0" Protocardium truncatum. 



" In the above section the Ironstone courses above the Marlstone are in all 16 feet 

 6 inches thick, and the shales above and below them (including the sandy portions 

 below) are 45 feet 6 inches (including the hard-bed shale above the thicker Ironstones, 

 50 feet 6 inches). Total from 62 to 67 feet. The shales are in some places 8 to 10 

 feet thicker." ^ 



1 'Yorkshire Coast,' p. 156. 



