Dr. C. Davison — British Earthquakes. 535 



A little farther up the stream, bluish-grey shaly clays, with layers 

 of earthy nodules, are exposed. About three-sixteenths of a mile to 

 the south-west of the cottage, Gotham Marble can be seen near 

 a spring. 



When stone is required for mending the tracks in the sylvan 

 district composed of Stoney bridge. Bays, Litley, Workhall, and 

 Hawkesbury Woods, shallow excavations are made, and the Gotham 

 Marble is usually laid bare. It is present here in its typical form, 

 and in cracks are frequently found iron - pyrites and baryto- 

 celestine, whilst in the upper layers of the marble JPseudomonotis 

 decussata is in places abundant. In a quarry near the brook between 

 Bays and Stoneybridge Woods, the Gotham Marble has been worked, 

 and in close proximity to that bed must be limestones with Psiloceras 

 Johnstoni. Above ai^e clay-deposits, such as were noted in the stream- 

 side near the cottage to the north of Hawkesbury Wood. 



The section in the lane near Sturt Bridge referred to by Murchison 

 is overgrown now, unless it be that in Chase Hill Lane. 



IV. — On some MiiNOR British Earthquakes of the Years 



1901-1903. 



By Chakles Davison, Sc.D., F.G.S. 



THE number of earthquakes originating within the area of the 

 British Islands during the three years 1901-1903 is 37, of 

 which 9 occurred in England, 20 in Scotland, and 8 in Wales. In 

 the 15 years 1889-1903 the total number recorded is 152, 39 in 

 England,^ 90 in Scotland, and 23 in Wales. So far as I know, not 

 a single undoubted earthquake has originated in Ireland during this 

 period ; but four earthquakes (the Pembroke earthquakes of 1892 

 and 1893, the Hereford earthquake of 1896, and the Garnarvon 

 earthquake of 1903) were felt in many of the eastern counties. 



List of Earthquakes, 1901-1903. 



1901. — July 9, 4.23 p.m. Carlisle (principal earthquake). 



„ about 4.26 p.m. Carlisle. 



,, 4.45 p.m. Carlisle. 

 July 11, about 11.10 p.m. Carlisle. 

 Sept. 16, 6.4 p.m. Inverness. 

 Sept. 18, 1.24 a.m. Inverness (principal earthquake). 



„ about 1.35 a.m. Inverness. 



,, about 2 a.m. Inverness. 



,, about 2.30 a.m. Inverness. 



,, about 3 a.m. Inverness. 



,, 3.56 a.m. Inverness. 



,, 9 a.m. Inverness. 

 Sept. 23, about 7.30 a.m. Inverness. 



^ Excludiug the slight shock felt on Aug. 27, 1S95, near Blisland (Corn-wall), 

 ■■ivhich may have been caused by a fault-slip precipitated by mining operations. 



