514 Notices of Memoirs — Prof. J. Milne — Earthquakes. 



by a small fault — similar yellowish limestone is seen, and passes 

 downwards into a shelly development. Terebratula simplex (but 

 only the pedicle valves) is abundant. The shelly rock is best 

 exposed in the west side of the southern or disused portion of the 

 quarry, and contains Terebratula simplex, Ter. plicata, Bhynchonella 

 subangulata, Bhyn. oolitica, Zeilleria circularis, Pygaster semisidcatus ?, 

 Diastopora, Spir opera straminea, etc., and ossicles of Pentacrinus. 

 About 2 feet of hard yellowish- white oolitic limestone is visible below 

 the Pea-grit, which latter attains a thickness of about 14 feet. On 

 the south side of the fault the shelly strata of the Pea-grit are inclined 

 at a high angle and rest vipon a massive deposit ot yellowish- white 

 oolitic limestone, thickly bedded in its upper portion but becoming 

 flaggy below. This Lower Limestone is about 34|- feet thick. The 

 whitish flaggy development is seen capping the promontory on the 

 opposite side of the quarry, and passes downwards into brown 

 arenaceous strata, very ferruginous in places, and becoming more 

 compact towards the base. This arenaceous rock — also containing 

 fragments of sea-urchins abundantly — is exposed for a thickness 

 of 13 feet. To the floor of the quarry is about 7 feet, and to the 

 water-retaining stratum from this point, as proved in an old well, 

 is about 8 feet. Thus, from the top of the arenaceous strata to the 

 water-retaining bed is about 28 feet. 



From evidence obtained in an old pit about 200 yards north-west 

 of Kemerton Castle the thickness of this deposit, which contains 

 a few Bhynchonella cynocephala, Ter. euides, and Belemnites, was 

 estimated at 33 feet. In many quarries on the hill it may be noticed 

 that the thickness of the Lower Freestone is very considerable. 



Summarized, our knowledge of the Inferior Oolite at this locality 

 is as follows : — 



(1) Lower Freestone. Whitish oolitic freestone. 



(2) Pea-grit equivalent. Compact yellowish limestone containing 

 fragments of Echinoderms and a few of the characteristic Brachiopoda. 

 14 feet. 



(3) Lower Limestone. Massive bedded yellowish- white oolitic 

 limestone. 34| feet. 



(4) Scissi beds. Brown ferruginous, sandy strata containing 

 Ter. euides, Bhyn. cynocephala, and a few Belemnites. 33 feet. 



n^OTICIES OIF" DVCIEIMIOIIEi?^, ZETO. 



I. — Earthquake Investigations.^ By Professor John Milne, 

 F.E.S., F.G.S. (Reporter). 



AT the present time this Committee enjoys the co-operation of 38 

 similarly equipped observing stations, which are distributed in 

 a fairly even manner over the different continents. All large earth- 

 quakes are recorded at each of these stations. At Professor Milne's 

 station in the Isle of Wight the number of records obtained during 

 the year is about 150. A map accompanying the Report sliows 



^ Eeport of Committee read before Section A (Mathematical and Physical Science), 

 British Association, Belfast Meeting, September, 1902. 



