OF MONTE SOMMA AND VESUVIUS. TG} 
metres 
_ Puase VI., Period 3. White, light pumice, with fine ash-beds ......... 9°00 
Puases VII. & VIII. Vegetable soil obscuring overlying beds ......... 10°00 
SECTION 3. Vallone Breislak. The main eastern branch of the Lagno del 
Purgatorio. The section is taken on the west side of the valley where 
the 290-metre contour-line crosses it. Tene 
BASED MOC OLIA se 4 sie cane ccs ocdgcrs cucarmeeeee: Sameer aed eels nica cou seeseeees 0°80 
Puase II. Fine dusty earth, greyish brown in colour, its components 
decomposed «55225... vA Sastre eee epee eaise aa sice eve sc wclacse eslea 
peAaE bie Percod, I NWihite, heht pumiiceycesetsterceiscscss ese. 0- sce. 0-30 
Period 2. Compact, black pumiiceous scoria ............... 0°40 
Period 3. Fine, interbedded with coarse, greyish ashy 
110111002 WORE Sista.) Haro dcic-ccd coaRt on CRARrOeOAnoC 0:20 
Black vesicular pumiceous scoria, with frag- 
MEMES /OL Limestone ww CHeeeEeE eee eee aaa ae ane 0-40 
Leucilitic lapilli, many brownish yellow, sub- 
angular, or rounded! eae eeseetmesseeee eee oeee 0:50 
The same, but finer even to dust ..........00.....- 0:80 
Period 4? Loose rounded lapilli, somewhat similar ...... 0°80 
Puasses IV., V., VI., VIJ.,& VIII. Coarse angular mixed breccia 
about 20:00 
SECTION 4. Canale di Arena. This section is a portion of the upper edge of 
the great escarpment of the Atrio del Cavallo, near the upper ramifi- 
cations of the Vallone Breislak. Hatred 
Puass I. Lavas, scoria, lapilli, and other allied materials ...... about 3800-00 
Puasss I1., I11., 1V., & V. Yellow soil much decomposed, with frag- 
AIMERNGS FOL «UNA LCO PEC.) MA nets chia tocls Sian: « Moura ee eee Reva 0:50 
Puss VI., Period 1. Hard, brownish grey, compact pumice, much 
decomposed. 
Periods 2 & 3. Yellow dusty soil, containing bits of pumice 0°70 
Period 4. White, light pumice, with large sanidine crystals 
in matrix, and few ejected blocks............... 0°50 
More compact, greenish grey, and with more 
{OReToM MAGlOn ee. sh. ccoce-ccateceee econ eee rc 0:20 
Greyeas ayaprsolibte bed Petes. esc eeeete eeeeeeee 1-00 
Puase VII., Period 1. Fine grey pumice, moderately light ............ 2-00 
Period 2. Subangular lava-lapilli, many yellow orbrown 1:00 
Period 3. Coarse large breccia with fragments of leucitic 
OIURIOU(Cre ba se ceddne ono Sencar soxauomanaascddasosoceon | or osonpdcadnbos 
Period 4. Black pumiceous scoria, with large broken 
leucite crystals, free, and enclosed in matrix.. 1:00 
Coarserbreecian 7: ash: 5. Meee eee nee rane, LUD) 
Period 5. Light black scoria, with two pink bands ...... 2:00 
Yellow ashy soil) .cce..0dstoewud oases peers: 0°30 
Period 6. Blackish and brownish grey pumiceous scoria, 
rich in large well-formed leucite crystals, leucitic lava- 
lapilli, many various ejected foreign blocks, and loose 
fragments of large leucite crystals ........2.2..2.....:..-. 1°50 
Pars Vill loose lapilli of late eruptions. --...0.00.. nesceseesseseeese es: ‘25 
SECTION 5. Vallone St. Patrizio. Section on the western side of the valley 
immediately above the junction of the path from the Cupa di Olivello, 
or near the 460-metre contour-line. 
Puase I. Lava. metres 
ese Le. Ler7zod W. White, leht pumice, .2.osercteceeeecaesesnsc see oa 0:80 
Period 2. Black pumiceous scoria......, Gite ten civ cite saeiwawies 0:60 
- Period 3. Lighter black spongy pumiceous scoria (rare), 
alternating with sand, and passing up to .................. 3°00 
“Period 4. Coarse breccia with blocks of lava ............... 7:00 
Puase V. Fine decomposed brownish soil ............ce.ceceseeececeeeoees 1:00 
