IGNEOUS AND CRYSTALLINE ROCKS. 27 
F. Gneissoid derivative, by pressure, of E. Camptonose. The same minerals, but 
with hornblende more abundant. 
G. Gabbro, wall rock of Split Rock mine. Hessose. Contains augite, hypersthene, 
brown homblende, garnet, plagioclase, magnetite, and possibly spinel. P. R.C. 1471. 
Cc D E. F G 
DIOS eueeuies deter). VIN ReCmarek se saanienes ee eheminsnamebmmad 56.94 | 47.16 | 44.97 | 46.74 47. 88 
Al2Qs. - 20.82 | 14.45 15.38 | 16.63 18.90 
CIO 8... csisack BtiGpysnisadaetoreuonaadaeae 83 1.61 2.29 2.17 1.39 
DOE 0 INCA ere me een RN Pe een rE UNO 3.02] 13.81 12.39 | 10.60 10. 45 
IMIG Os a5 Sete oils aGiaehea eee CH ie Riciaytors orareiancersions 2. 36 5.24] 10.89 6.11 7.10 
DAO 2. as soy bend erecheeste iis tetterycemimcctoctmsorsi spare 9. 41 8.13 7.50 8. 66 8. 36 
NazO Sisiacalecahbneas nici araue Retetceaa 3. 36 3.09 3.02 3. 81 2.75 
DO) Secrastest riccaige ainsi eajamenentnsa magia aracls 1.58 1.20 56 86 81 
EO: BOO erep ras cen act cleehy praia eee eo 221 x12 -10 12 18 
H20 BOVE MLO asc avenessaeds vase acee oe 59 48 65 73 +43 
WN OF: eaves ememamoan ac meee wrens ccamaicne ae 44 3.37 1.18 2.54 1.20 
Pa OS reraya a crtetet auch Sete ea iamiee aimeareraiele 07 557: 14 33 20 
Ws Oa ez eriihatite toc ic shes aecidaiancqoisaaysicloneleathonase (2) (2?) -02) (2) (?) 
NEO} COO sce dasicindhssidrejnaiisapadeiocioens trace - 02 -02 03 02 
MNO) 2 cose tices tet nem eomeeemamae ded. il 24 22 26 16 
BS Os sisai2 sac cyasieeaeiaee ea nem ais neme oe 05 | trace | trace| trace trace 
CO ee a sncuscmemmannas ayaeeemsimatecisleeceress 45 285 ‘ 07 12 
ee ccc pea SVS RIS espns ernsste cc crens YE cianecc are ea nten ata arm dec svapsicnesa trace 14 06 il 07 
100.24 | 99.98 | 99.64] 99.77] 100.02 
ZrOz, Cl, and F not looked for. CrgO3, LizO, and SrO present in traces. S is, in part at least, present 
as pyrrhotite. 
The following titaniferous magnetites, from Elizabethtown, are regarded by Kemp 
as being of magmatic origin, and are therefore included in this tabulation. 
H. Near Lincoln Pond. 
I. Oak Hill pit. 
J. Tunnel Hill. 
K. Split Rock mine. 
H and [ are classed by Washington as Adirondackiase, J and K as Champlainiase. 
2. MISCELLANEOUS ROCKS. 
A. Peridotite, from Dewitt, near Syracuse. A rock described by Darton and Kemp, 
Am. Jour. Sci., 3d ser., vol. 49, p.456. Contains olivine, partly serpentinized, biotite, 
and augite, with magnetite, apatite, and perofskite. Possibly a little chromite also. 
Classed by Kemp as limburgite. P. R. C. 296. 
