118 H. J. JOHNSTON-LAVIS ON THE GEOLOGY 
Puase VI., Period 3. White, light pumice, &. ....0.......cecceceeee one 0:20 
The same rolled, rounded, and false-bedded ... 1°80 
passing up into— 
Yellow, much decomposed, dusty soil, often 
pisolitic, and containing near its middle a 
eoncretionary bed (0°20) ........2.50. Aeenceees 2:00 
Period 4. Fine-grained, light, white, sanidinic pumice, 
mixed chiefly with leucilitic lapilli, very ashy 
ab GOP teaskeLaeeasacsssandecte dca ee 0°50 
Compact, greenish-grey pumice, with leucilitic 
lapilli, and abundance of foreign ejected 
BLOCKS (2. cree esee ccs ..0s25+dcsneee eee 3°50 
Light grey, pisolitic tufa, passing up into ...... 4:00 
Puass VIL., Periods 1 to 3. Pumiceous breccia very variable as to its 
components and coarseness. (It shows sometimes 
thick beds of Plinian pumice ?)................--.200+++ec00e 14°50 
Period 4. Black; pumiceous scoria (leucitic), occasionally 
compacted together, and altered to a brown colour ... 15°00 
Periods 5 & 6. Breccia, very variable as to its compo- 
nents’ and’ COarSseness ices. se esec etn heed eee 9:50 
SECTION 10. Cupa di Pallarino. General compound section of this valley and 
its large northern branch. These two are often known as Riva and 
Cupa di Quaglia; but in this paper I follow the great contour-map 
so as to avoid ambiguity. metres. 
PuasE VI., Period 1. Yeliowish-brown earth with much rolled, light, 
Wikibe PUINIES o5.0. 50/00. 2. bect scence oeaseaece eee eee eee 
Period 2. Black pumiceous scoria in rather large masses 
with Jencilitte lapilli ..:.22,..\..200..-cse eee ; 
2 Hinievash bed ...5...55..s..00 s--ses oes hee eee 0-25 
(Break in continuity of section). 
Period 3. Light, white pumice, with leucilitic eee 
forming a band, especially near the middle... 4:50 
White, light pumice, but smaller and richer in 
leucilitic lapilli as the top is approached ... 2:00 
Greyish ash-bed with pumice, very pisolitic ... 2°00 
Period 4, White, light sanidinic pumice, water-rolled, with 
many bits Of SCOR). 2 .2......te.<22- 2-20 eee 0°60 
The same unrolled, passing up into coarse, com- 
pact, greenish-grey pumice, rich in ejected 
foreign blocks and leucilitic lava ............... 6°50 
Grey ash-bed, pisolitic, passing imperceptibly to 0°50 
PuaseE VII., Periods 1 to 6. Coarse and fine breccia, false-bedded, sand, 
GCs oa wien Soe sabedonnemsde gs eReee eon OSceen es ae 2 to 70:00 
Prase VIL1.. Lava.of USi2s.. 0. ease peste peeee set ecew Cae ee Le OD 
SECTION 11. Quarry near Pension Soleil, S.S.E. of Pompeii. metres. 
PuaseE I. Coarse leucilitic lava, much kaolinized near the tOp Secon 3°00 
Puasss IT., III, IV., V., & VI. Yellow-brown dusty soil, with a few 
fracments of highly decomposed pumice (old gardens 
of the Pompeians).. 2sauasine ee eee eee tees. Seeee ee 2°00 
Puase VII., Period 1. Plinian pumice, whiter and more vitreous at: 
the bottom, but coarser and microcrystalline 
ab, the :bOpat a eee ae Oe Sc sn dans meee 3°50 
Pisolitice asta eieiecger peeaert ct «20m. 00 2p cee 0-10 
Leucilitic lapilli, and compact greenish pumice 0:10 
Pisolitic ashi. eeeeeeeee ys. ee sss ensa0. skeen eee 0°50 
Leucilitic lapilli, and compact greenish pumice 0-10 
