178 messrs. kirkby and duff on the 



Brockwell Seam :- — 



At the point marked A, and for a considerable district about 

 it, the roof of the seam is a light grey shale, filled with large 

 stems of Catamites approximates and C. cannaformis. Nearly 

 all of them lie in one direction : some are eight or nine feet 

 long, and several have the base of the stems perfect with the 

 roots attached. 



For several bords near the point B the roof is formed of large 

 flattened stems of Sigillarm lying in various directions. Some 

 of them exceed twenty feet in length, and are from twelve to 

 eighteen inches wide. The specimens are not well preserved, 

 and may belong to more than one species : some show character 

 enough to allow their being referred to S. reniformis. 



At C a roof, similar to that at A, occurs, and in it are found 

 the remains of Pecopteris laciniata, and more rarely one or two 

 other ferns, and Catamites a-pproximatus. There is not the pro- 

 fusion of remains here as in the two former cases. 



At D the roof is a dark grey shale filled with the remains of 

 Asterophytlites and SphenophyUum, almost to the exclusion of 

 other fossils, and more remarkably so to that of Catamites. 



At E a change takes place. There is a sandstone roof, with 

 inpressions of worm-tracks, and no indications of plants. 



At F the roof is formed almost solely of masses of Catamites 

 approximates and a more coarsely ribbed species, probably C. 

 cannceformis. 



At G the roof is a softish grey shale, with an abundance of 

 ferns, belonging to the species Pecopteris laciniata, Svihenopteris 

 Hdninghausi, Neuropteris gigantea, Cyclopteris ohlata, and others, 

 together with large quantities of Pinnularia capillacea, Nceggera- 

 thia flabellata, and other species. 



At H sandstone again forms the roof of the seam, and the 

 only fossils in it are some rude impressions of Sigillarice, and, 

 in the coal itself, sandstone casts of Stigmaria. 



At I vertical stems of large Sigillarm are not uncommon in 

 the roof. 



It will be seen from the accompanying diagram that the above 

 localities range from the north-east to the south-west, this being 



