128 
THE GEOLOGIST. 
over the coal. There are some curious circumstances connected with 
these ferns ; they are exceedinglj'' uncertain in their whereabouts, and 
were very much more abundant when the workings were first begun 
than they are now. Sometimes the workmen would come upon a 
large quantity of one sort, such as Pecopteris Mantelli, which would 
then utterly disappear, and would not be found again. From the fact 
of several Sigillariae being found in erect position, I at first inclined to 
the opinion that the ferns were in the same place on which they grew ; 
but on a fuller consideration of the matter, I now think, with 
Professor Melville, that this is a drift formation. I have obtained 
here, with the help of two very intelligent miners named Davis and 
Hart, who appear as much interested in the geological facts as myself, 
the following specimens : — 
Annularia brevifolia Pecopteris dilatata 
Asterophyllites foliosus „ Cistii 
„ Parkinsoni „ caudata 
,, longifolius ,, laciniata 
Calamites approximatus „ Mantelli 
,, cannaeformis ,, nervosa 
„ Suckowii ,, repanda 
Fructification of an Equisitaceous plant ,, serra 
Hippurites longifolius ,, Stuttgardiensis 
Knorria imbricata ,, urophylla 
Lepidodendron crenatum Pinnularia capillacea 
„ elegans Pterophyllum 
„ minus Sigillaria flexuosa 
„ obovatum ,, oculata 
„ Sternbergii ,, pachy derma 
,, plumarum „ reniformis 
Lepidostrobus „ tesselata 
Neuropteris acuminata Stigmaria 
„ gigantea Sphenopteris affinis 
,, heterophylla „ caudata 
„ macrophylla „ dilatata 
Pecopteris adiantoides „ elegans 
,, dentata „ latifolia 
„ denticulata „ macilenta 
In the three-quarter coal a shell, (a terebratula, I believe,) has been 
found by my friend Mr. Adams, also a shell in the Bydyllog coal. 
The upper Darren coal and mine shale possesses two species of small 
Unios and an Avicula. The black band over the old coal has furnished 
us with a large Anthracosia and a small shell like a Nucula, also 
the scales of Holoptychius. The spotted and black pins have the 
Anthracosia agrestis and Microconchus carbon arius, while the bottom 
vein is very prolific in scales (carved and enamelled), teeth, jaws, 
opercular scales, bones, skin, rays and ichthyodorulites of fishes belong- 
