1865.] DAAVSON — COAL-FORMATIOK. 119 



This is a group of unusually thick beds, indicating long ft. in. 

 quiescence. The roof includes laminae of coal, some of them 

 composed of the bark of Sigillaria catenoides, also an erect 

 Slgillaria rooted in the coal below. The coal and coaly shale 

 exhibit remains of Sigillaria, Cordaites, Lepidophyllum, and 

 Cyperites ; and one layer has many hard pyritized fragments 

 of wood. The mineral charcoal has vascular bundles of ferns, 

 coarse scalariform tissue, and porous tissue. The underclay 

 rests on a bed with Naiadites. 



(Underclay, Stigmaria, and grey and carbonaceous 



shales) 18 



{Shale and coaly layers. 

 Coa^4feet 4 

 Argillaceous underclay, Stigmaria. 



The roof has obscure fragments of plants and stumps in . 

 the state of mineral charcoal. The coal shows impressions 

 of flattened trunks, probably Sigillarice. This coal contains 

 a great variety of tissues, especially bast and scalariform of 

 different kinds, and epidermal. My measurements in this 

 part of the section differ somewhat from those of Sir W. E. 

 Logan, who, I suppose, had not a good opportunity of ex- 

 amining the two last coals. The coal 29a is now mined by 

 an adit from the shore, called the " new mine." 



(Sandstone and shale. One sandstone has many large 



erect Sigillaria, some of them with rough and 



furrowed bark) 35 



^Argillaceous shale and ironstone. 



Coal 4 inches. 



Underclay, dark-coloured, 2 feet. * 



^1 QA J Coal and coaly shale 2 inches. 



Coal-group 30... ^^^^^3-^^^^^ J 



Coaly shale 2 inches. 

 I Coall inch 3 



\ Soft argillaceous underclay, Stigmaria. 



The roof has bark of Sigillaria preserved in ironstone. 

 The coal is pyritous, and consists of layers of mineral char- 

 coal alternating with bright coal ; it has obscure impressions 

 of plants and bast tissue in the mineral charcoal. 



(G-rey shale and sandstone. One underclay, and 



erect Calamites and Sigillaria at two levels) 19 



/^ G-rey sandstone. 



{ Coal and coaly shale 1 foot, 



CoaI-group31... JJ„— ^.fSr'l'°°'- 



CoGZ2inches 2 8 



\ Argillaceous underclay, Stigmaria. 



The roof contains Sigillarice, and the coal has flattened 

 impressions of the same. This coal is remarkable as having a 

 roof of sandstone. Its underclay is also peculiar. It is about 

 9 feet in thickness, and contains Stigmaria and nodules of 



k2 



