Revieics — Mesozoic Rocks of Kent Coal Exploration. 131 



Fifeshire vents. It may well be, however, that on a thorough 

 examination of material in these vents, a fuller correspondence may 

 be established, in both intrusive and extrusive types, with the 

 A-yrshire district. It is possible, therefore, that just as the intrusive 

 alkaline rocks of the west are related to the jMauchline volcanic 

 episode, so the similar rocks of Fife and the Lothians may be related 

 to the latest (' Permian') volcanic episode of that distiict. 



The fact emerges that the distinctively alkaline phase, at least as 

 regards the intrusive types, began earlier in the Lothians than in the 

 West of Scotland. In the former area the alkaline intrusions date 

 from the Carboniferous Limestone; in the latter from the Coal-measures. 

 The western suite as a whole was a little later than the eastern, and 

 links itself definitely with a late Carboniferous or Permian volcanic 

 episode ; whilst the eastern suite appears to bridge the gap between 

 the Calciferous Sandstone lavas and the 'Permian' volcanic episode 

 of Fife. 



Considered in relation to the homogeneous mass of alkaline types 

 erupted during the Carboniferous period in the Midland Yalley of 

 Scotland, the western suite falls into place — recognizing the time 

 element in petrographical provinces — as a sub-province and sub- 

 period of the Carboniferous period-province of Central Scotland. 

 Excluding the Glasgow teschenites, the boundaries of the sub-province 

 are well defined to the north by the great mass of Calciferous Sand- 

 stone volcanics occupying North Ayrshire and Renfrewshire. These 

 rocks, with Old lied Sandstone, also bound the area to the east. On 

 the south and south-west the great Southern Upland marginal fault 

 forms the natural boundary. To the west, however, the extension of 

 the sub-province is indefinite. Some part may be faulted down beneath 

 ■the Firth of Clyde. It extends at least as far as the Lady Isle, a 

 teschenite mass in the Firth, 3 miles west of Troon ; and may also 

 include Arran and Bute. The Glasgow teschenites, as before stated, 

 are remote from the Ayrshire district, and are possibly outlying 

 members of the Lothians sub-province. It may be said that the 

 western sub-province is approximately co-extensive with the county 

 of Ayrshire, and that its time-boundaries are Coal-measures to Early 

 Permian. 



i?,E"VIE"V7"S. 



I. — Geological Sfrvet Memoiks. 

 On the Mesozotc Eocks in some of the Coal Explorations in 

 Kent. By G. W. Lampltjgh, F.R.S., and F. L. Kitchin, M.A., 

 Ph.D. 8vo; pp. vi, 212, with 5 plates and 5 text-illustrations. 

 1911. Price 3s. U. 



XT is well that the Geological Survey has been able to rescue from 

 oblivion a most important series of data, stratigraphical and 

 palseontological, that have been disclosed by some of the coal explor- 

 ations in Kent, and in particular by those at Dover, Brabourne, 

 Pluckley, and Penshurst. The researches, of which the results are 

 embodied in this memoir, were indeed commenced so long ago as 1897, 



