6 PROF. A. H. GREEN ON SOME RECENT [Feb. 1 895, 



a similar character were dug out of loose decomposed surface-rock 

 at the western end of the reservoir. 



A calcareous bed was cut through towards the northern end of 

 the puddle-trench, which contains 65 per cent, of calcium carbonate. 

 About one half of it is seen under the microscope to be made up of 

 strings and ramifying masses of what is probably calcite ; the 

 remainder is transparent and structureless, and polarizes in a dark- 

 grey colour. 



An adjoining bed has evidently been originally a crystalline 

 rock, for the outlines of the crystals are still visible, though they 

 are too decomposed to be identified. It contains what seems dis- 

 seminated calcite, but in much smaller quantity than the last rock,, 

 and its analysis yields only 13 per cent, of calcium carbonate. 



It looks as if we had here two rocks belonging to the volcanic gr,oup, 

 one of which has been very largely and the other slightly calcified. 



I deferred the publication of these notes in the hope that I 

 might be able to find elsewhere in the Malverns rocks similar to- 

 those of the Warren House area. I cannot say that even now my 

 examination of the hills has been exhaustive ; but I have been 

 over the whole of them, and have found rocks which bear some 

 resemblance to those just described at two spots only. One is 

 on the southern part of Raggedstone Hill. We have here rocks 

 which have a bedded aspect, and some of which have externally 

 a felsitic appearance resembling that which prevails so largely 

 among the Warren House group. The general resemblance between 

 the two was noticed by Prof. Phillips (Mem. Geol. Surv. vol. ii. pt. i. 

 p. 26) ; it is hardly so close as appears at first sight. 



The accompanying figure shows the section along a line running 

 due east from the Trigonometrical Station. 



No. 1 is pale grey, soft, micaceous schist. The space No. 2 is 

 grass-grown. No. 3 has a crushed and rolled-out look ; it contains 

 wavy films of a chloritic mineral ; streaky bands of quartz showing 

 strong strain-shadows ; felspar, some triclinic; augite, and (?) epidote. 

 It may well be a crushed and sheared dolerite. No. 4 contains 

 fibrous hornblende, shattered felspar, and much disseminated 

 limonite. Mr. Teall tells me that it is very like some Cornish 

 epidiorites. No. 5 is confused by a network of quartz-veins. No. 6 

 scarcely differs from No. 3. No. 7 is a felsite ; it shows no signs 

 of mechanical deformation, and it may be intrusive. No. 8 and 

 another rock a little farther east are epidiorites, which Mr. Teall 

 tells me are like some Cornish rocks that have resulted from the 

 alteration of gabbros. Slides taken from bosses a little north of 

 the line of section and some way to the south are practically identical 

 with No. 3. Another rock south of the line of section consists of 

 rolled-out quartz and felspar-grains foliated by thiu films of mica ; 

 it is just such a rock as would be produced by the shearing of No. 7. 



In a quarry 20 chains south-east of the Trigonometrical Station 

 the upper beds consist of green fibrous hornblende, torn and wrenched 

 and dragged out into wavy films, and plagioclase. There is probably 

 a little augite, so this is most likely an epidiorite. The bottom bed is 



