OF MONTE SOMMA AND VESUVIUS. 1G 
metres. 
Puase VI., Period 4. White and greenish grey, compact pumice, with 
fra ements of foreign ejected blocks ............ 1°50 
Fine grey ashy bed with pisolitic concretions . 2°00 
Puase VII., Periods 1 to 3. Very irregular false-bedded breccia and 
GULLY inc icles wis sR I EEE eek ss eGie wise wins 6:00 to 25:00 
Period 4. Black pumiceous scoria, with broken leucite 
erystals, &C: 2202-24000 Peete cre Seis qed Genie anatase 1:50 
Periods 5 & 6 and 
ecisemv lit 7@oarse: breccia. .........sce-cceedseteaseenay- ese ss aces ve saicepletseg 10-00 
Nore. The section is for the most part inaccessible, the loose large blocks 
preventing it being scaled and minutely examined, as in other cases. Figure 1, 
p. 87, is taken a little lower down the lagno, on the same side. 
SECTION 8. Vallone Von Buch. The Lagno di Pollena divides near the 250- 
metre contour-line into two large branches; the left hand one, being 
nameless, I have called after the celebrated vulcanologist. Itis in the 
more southern branch of this, near the 450-metre contour-line, and 
at the foot of a cascade, that the following section was taken. 
Puase I. Lava and scoria metres. 
Puassz II. Fine dusty soil, probably ancient vegetation-surface......... 0°30 
Banonelieeecrcod. ly VWihiterioht, pumice, Sc. .o..<.c07-4-2sseeeseecee: 0-40 
Period 2. Compact, black, pumiceous scoria ..........08... 0-40 
Period 4. Subangular breccia, with black spongy scoria 
ELLA OLLOMM ASE Nero ia ge sate sc sivas kisah cle Sea tea eR Ome ace ee 4-00 
Palsn LVe, Period |. Pinkish, or violet-exrey lava ........s.2<0+s.enssee< 0-50 
_ Period 1 or 2. Black, or reddish spongy scoria ............ 6:50 
Puase VI., Period 1. Compact, brownish-grey pumice, Xe. ............ 1:50 
Stratified, coarse and fine breccia .........2.-06. 3°00 
IACTLO Oa WNC OAS ye SOU yar eacay seis ances oss usee seecneneterer 2°50 
CLOG Oa NV Ibe mle: Hib) PUMICE ECs; He es. oe-ssonsetee 0:20 
Iga, \lMisey, Gislany | O MON(CS) GP sep seseucoRdaconocccoao= 0°50 
WWihite elie lntipormicey deen yen scatceu-eeeerereseee 0:50 
Minewnolileds moammice rea is.ceeeecin sa. sen saneecadeaseee 2:00 
Contcretionatiyabe dicen canes cae .: seine wenaeeeene 0-10 
Mellowsashiys soil ta sate ieccit). «oelancinessendomnoeeeee 0:50 
Period 4. Compact, greenish-grey pumice, with a whiter 
sanidiniferous variety at bottom. Many 
ejectedstoneremyblOckse.c 22sec. snecacse ae eeee 3°50 
Hine verey, pisoliticiashy... 7.122. 204-nrcesseteenerees 100 
Puasses VIT. & VIII. False-bedded sand and breccia .............00.00+6 5°00 
SECTION 9. Vallone, and Lagno di Pollena. General section on 8.W. side of 
the valley. 
Puase I. Lava and scoria alternating metres. 
eancmebule: Pero Me  NV bite, loht pumice .........asnceeeeeeteeaeeee 0-40 
Eeriod) 2. Black. pumiceOus SCOFIA) -2s.-smseaseeseen eee eee 0°30 
Period 3. Fine ashy matter, rounded leucilitie lapilli, 
OASSUN OP ULTLO se os5 .heis so. tis elses eee eee centen ia 0-80 
Period 4. Very coarse, violet-brown breccia, with large 
davanblocks: [scoria, W860. sis.<5: «<2 0 senate emeeoeee bees cee 55:00 
Puases IV. & V. Brownish yellow material resembling the above but 
MOTE CeCOMPOSE....\);......0.:44 see eReEER Ree tere E « osiecis aes 0-40 
Puase VI., Period 1. Hard, brownish-grey, compact pumice with leuci- 
litic lapilli ,containing consolidated bands... 2°00 
Fine ashy-grey sand, with many blocks of lava 
much decomposed mesereererecacecas eee erees 3°00 
Period 2. Fine yellow dusty soil, with occasional bands 
of rounded waterworn pumice, often very 
false-bédd etl ieter meme eee ie tones cs ots sseuslemenssses 2:00 
