114 H. J. JOHNSTON-LAVIS ON THE GEOLOGY 
SECTION 1. Vallone Pietri Pomice. A compound section taken between the 
500- and 675-metre contour-lines, chiefly on the N.W. side of the 
valley. 
Puassz I. Ancient lava. metres. 
Puase II. Subangular or angular leucilitic breccia...............c0.0eeeee 5:00 
Puase III., Period 1. White light pumice and. ................0..cecec0e 1:00 
Period 2. Black compact pumiceous scoria ............+0++6 0°50 
Period 3. Fine rounded leucilitic lapilli, some yellow or 
brownish, with a few black vesicular pumiceous scoriz.. 1°00 
Period 4. Angular and subangular breccia ..............-++ 1:00 
Puase IV., Periods 1 & 2. Red and black scorize .............--.escccses 4:00 
Puase VI., Period 1. Hard, brownish grey, compact pumice, leucili- 
tie Tapilli, &e0 et eee ee oe. ee 1:00 
Period 2:?: Yellow ashy soul Rone... 35.22... eesae eee 0:60 
Period 2. Rounded spongy, and light grey or yellowish 
pumice, with. thin ash bands). .........-..-0.4.0-+ sae eee 0°60 
Yellow dusty gouty... 6... 0+. 00 -sieecneeee eee 0°60 
Period 3. White, light pumice, with thin interlaminated 
ash-bandss.. 2. fis best sen see es cenit 2°40 
Coarse yellowish concretionary bed ............... 0°30 
Waterworn lapilli and pumice .......0....se0000+ 0°40 
Another concretionary bed. .....-.--.«.:.-2--"-6e 0:25 
Decomposed yellow ashy soil ................-2+6- 0°60 
Period 4. Greenish grey, compact, or light pumice, with 
many altered sedimentary rock fragments .............0. 0:50 
Puases VII, & VIII. Mixed, waterworn and re-sorted tufa, enclosing 
at one point 
Period 5, Fine black, light vitreous scoriz, and a pink 
ash-band (s.0. 0c... .c6 age eXal hee noa tetieiides «eee eeaneete very variable 
N.B. The sections in the Vallone della Trofa very much resemble that of 
the Pietri Pomice. 
SECTION 2. Vallone Sanseverino. A compound section derived from both 
sides of the valley between the 250- and 350-metre contour-lines. 
PuaseE I. Coarse leucilitic lava. metres. 
Paase UL. Kine: brown sol oiccc ccs cskeccewoaecon see asset cove: case 0:60 
Puase TILT, Percod 1. White, lisht pumice, &c. ....5.....--.acceasne=eeeen 1:00 
Period 2. Black compact pumiceous scoria, , with a few 
ejected fragments of limestone, fossiliferous 
MATS, GG. « sssse seoewceectes «cee telee see ee 1:00 
Hino ashched , ossstesrasecsnndscs <0». ceca eae 0°25 
Period 3, Subangular and rounded leucilitic lapilli, some 
yellow or brown with black, vesicular, pumiceous scoriz 2°00 
Period 4. False-bedded fine dust, or coarse breccia, water- 
worn, reddened at the contact with the overlying lava. 2°00 
Puase IV., Period 1. Spongy pinkish or violet-grey lava, much lami- 
nated horizontally:  Azse:.taeecbeks.gewck~. be. decade 2:00 
Period 2. Reddish spongy: SCOVMa ..........00c00e0+sencanseaues 0:80 
Tough, bluish grey vesicular lava..............2.4. 1:50 
PuasEe V., Period 2. Greyish brown earth, with scoria and subangu- 
lar lava blocks at Dottoude eoecs nc -.cn--0ec+--c002sscne eee 0:90 
Puase VI,, Period 1. Hard, brownish grey compact pumice, with 
many lapilli of leucilitic lava ................+. 0°75 
Rolled and bedded pumice, scoria, and lapilli, 
chiefly of the bed below... ......2....-:.-.s«:seaee 6°50 
Period 2, Yellow soil with fragments of white pumice... 2°50 
Light grey, spongy, yellow, or grey pumice, 
rounded and with thin ash-bands..............- 0°75 
