126 



PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [Doc. 20, 



The number of coals reckoned may vary according to the manner 

 in which the several layers are grouped; but as arranged in the 

 above sectional list it amounts to eighty-one in all. Of these, 23 are 

 found in Division 3 of Logan's section, being the upper member of 

 the Middle Coal-formation ; 49 are found in Division 4 of Logan's 

 section, being the lower member of the Middle Coal-formation ; 9 

 occur in Division 6 of Logan's section, or in the equivalent of the 

 Millstone-grit. In the latter group few of the coals were suffi- 

 ciently well exposed to enable a satisfactory examination to be made. 

 I have grouped the remains under three heads — External Forms of 

 Plants, Microscopic Structure of Plants, and Animal Eemains — and 

 have arranged the forms under each in the order of their relative 

 frequency of occurrence. 



Table showing the Relative Frequency of Occurrence of Genera of 

 Plants and Animals in the Coals of the South Joggins. 



Names of Fossils. 



Division 3. 

 23 coals. 



Division 4. 

 49 coals. 



Division 6. 

 9 coals. 



Total. 

 81 coals. 



Plants. 



Sigillaria occurs in 



Cordaites 



Pilices {mostly Aletho- 



pteris lonchitica) 

 Lepidodendron and 



Lepidophloios . . . 



Calamites 



Carpolites, &c ,, 



Asterophyllites 



Calamodendron 



Structures. 



Vascular bundles of 



ferns 



Bast tissue ( Sigillaria) 

 Epidermal tissue 



{Cordaites, &c.) ... 

 Scalariform (Sigil., 



Stig., Lepidod., &c.) 

 Discigerous ( Sigillaria 



widi Badoxylon, &c.) 

 Reticulated ( Calamo- 

 dendron, Ferns, &c.) 



Animals. 



Fishes (Palcsoniscus, 



Bhizodus, &c.) ... 

 Naiadites {Anthra- 



comya, &c.). 



13 

 15 



Cythere 



Insects(?) 



Reptiles {Dendrer- 



peton, &c.) 



vetusta and Xylo- 



bius sigillari<2 



34 



26 



17 



15 



12 

 9 

 2 

 1 



22 



16 



6 



9 



8 



16 



16 



16 



13 



3 



1 

 1 



49 

 41 



23 



16 



16 



11 



3 



1 



30 

 20 

 12 



11 



10 



3 



18 



17 



16 



14 



3 



1 

 1 



