262 



Just before the " main seam" is reached, upright tree 

 trunks and roots are found in abundance in one of the shale 

 beds. The "main seam" is indicated by old workings and 

 excavations, but its very top may be seen if tidal conditions 

 are favourable. The shales overlying it have furnished 

 many species of plants. A few metres beyond the main 

 seam, Anthracomya and ostracod s, may be found in black 

 shales in an old excavation in the cliff. 



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