Dr. Mac Culloch on the Section of Heligoland, 323 



substances imbedded in them, together with porphyries and horn- 

 atones of various colours. 



Belemnites, and other fossil remains, both calcareous and flinty, 

 are also found on the shore ; and the clay strata often contain consi- 

 derable quantities of pyrites, together with carbonized and pyritaceous 

 wood. 



2s2 



