¢ 
By Thomas Bruges Flower, Esq. eee 
of the strata and of the localities, where in quarries or in natural 
sections they may be most easily studied. 
SrraTa. Locatitigs. 
Purbeck beds, Swindon, Tisbury. 
Portland beds, Swindon, Tisbury, Crookwood. 
Kimmeridge clay, Near Devizes, Wootton Basset. 
Calcareous grit, Calne, Seend, near Steeple Ashton, 
Coral rag and pisolite, Calne, Steeple Ashton, Westbrook 
Oxford clay, New Inn near Devizes, Chippen- 
ham, Trowbridge. 
Kelloways rock, Kelloways, Chippenham. 
Cornbrash, Chippenham station, Lacock, Cor- 
sham, Trowbridge. 
Forest marble, Lacock Abbey, Atford, Stanton 
St. Quintin. 
Bradford clay, Bradford. 
Great oolite, Bradford, Box, Monkton Farley. 
Fullers earth, Near Box. 
Rivers AND CoMMUNICATIONS. 
The county is included in the three basins of the Thames, the 
Severn, and the Christchurch or Salisbury Avon. The northern chalk 
district, and the northern part of the county are included in the 
basin of the Thames. The southern chalk district, with the Green 
sand district which begirts it, the Vale of Pewsey east of Devizes, 
and Market Lavington with the Vale of Wardour, belong to the 
basin of the Salisbury or Christchurch Avon. The western side of 
the county south of Warminster belongs to the basin of the Severn, 
and the south-western border about Stourhead and Mere is drained 
by the Dorsetshire Stour, being included in the basin of the Avon, 
with which the Stour unites in Christchurch haven. 
The Thames rises in the south eastern slope of the Cotswold 
* It may here be remarked, that the strata of Wiltshire generally abound in 
fossil organic remains, and the works of modern paleontologists, have been 
much enriched by Wiltshire examples. Some large local collections have been 
made, and it is to be hoped that our Society may ultimately be able to exhibit 
a good illustration of the County Geology. 
