GEOLOGY OF THE BEISTOL COAL-FIELD. 341 



our district^ and is so similar to the coal shales, that the absolute 

 division cannot always be positively stated. The beds are not 

 visible in the southern portion of the coal-field, but come to the 

 surface and afford excellent opportunities for inspection at Crew's 

 Hole, Hanham, Stapleton, and Winterbourne. In the railway 

 cutting at Alangotsfield station, an especialty good section may be 

 seen, containing traces of Coal. Between Mangotsfield and 

 Winterbourne two seams of Coal have been worked. 



Three of the Kingswood seams may almost be regarded as 

 belonging to the Pennant. 



At Stapleton, many fine specimens of trees have been found. A 

 year or t\vo ago the trunk of a Sigillaria elongata (Brong.) was 

 exposed, 30 feet long, with both ends buried, so that the total 

 length must have been great. The pennant is extensively quarried for 

 building purposes, especially where large slabs are required. The 

 steps in front of the Museum are Pennant, and are full of fossil 

 wood. 



At Nailsea the Pennant thins out, the total thickness being only 

 about 450 feet. There a seam of Coal 3 feet thick occurs near the 

 Church. 



Pennant Sandstone often so nearly resembles Millstone Grit in 

 its composition and structure, that it is quite impossible to 

 distinguish them. 



Five seams of Coal have been worked in the Pennant series, 

 giving 10 feet of Coal. 



In the Pennant, the following fossil plants have been collected. — 

 Halonia irregularis (Lindl.) 

 Ulodendron minus (Broug.) 

 majus (E. & H.) 

 Knorria intricata (Sternb.) 

 Calamites approximatus (Broug.) 

 arenaceus do. 



cannceformis (Schl.) 

 Suckovii (Broug.) 

 Sigillaria elongata do. 

 ornata do. 



