secretary's report, 1906. 
215 
150 feet lower down in the series, highly vesicular and slaggy in 
places, which is brought up by a small dome which can be plainly 
seen from the railway. At the junction of Tideswell Dale with 
Miller's Dale the thin cherty beds are faulted against the upper 
toadstone and limestones above it. This probably cuts out 
100 feet of thick limestone. Tideswell Dale is a narrow limestone 
gorge which winds according to the two rectangular series of 
joints in the limestone, and is now almost dry. The old marble 
quarry was visited, where a good section was seen of an intrusive 
dolerite, which cuts across the limestone and the lava, and has 
baked a bed of volcanic mud forming little roughly hexagonal 
pillars. The basalt also in places takes on a roughly columnar 
structure. The limestone underneath the intrusive rock has 
been converted by the heat into a marble. Higher up the dale 
good sections of the limestone were found by the roadside show- 
ing beautifully weathered corals and brachipods, the beds them- 
selves being dislocated by a series of pretty step-faults. 
After lunch at Tideswell and inspection of the fine four- 
teenth century church, the party walked to Litton, examining a 
quarry on the way, which showed a section of chert beds inter- 
bedded with fossiliferous limestone. After passing through 
the clean little vUlage of Litton, with its large village green 
newly planted with trees, a visit was paid to an excavation 
for a tank in connection with the water supply. Here an ex- 
cellent section of volcanic tuff, regularly bedded, was examined. 
The time available before the train, on returning to Miller's 
Dale, was utilised by a walk into Chee Dale, the autumn beauties 
of which were much admired. 
The General Meeting was held on Friday evening, under 
the chairmanship of Mr. J. Norton Dickons, of Bradford. Mr. 
James Burnley, Bramhope Hall, was elected a member of the 
Society. 
Mr. H. H. Arnold-Bemrose, F.G.S., then gave an address 
on " The Geology of the District," illustrated by lantern slides. 
In Derbyshire Igneous rocks are found in both the Car- 
boniferous Limestone and Yoredale rocks. There are beds of 
contemporaneous lava and tuff, with volcanic vents from which 
