ASSOCIATED ROCKS OF PORTHALLA COVE, 
becoming more siliceous. All 
these beds I regard as newer 
than the rocks of Nelly’s Cove 
and those immediately to be 
described, both the latter hay- 
ing a more considerable dip to 
the S.E. or H.S.E. They have 
probably been let down by a 
pair of faults. 
We now come to the tract 
which forms the main subject 
of this paper, extending east- 
ward from ‘the fault” to Mr. 
Hickes’s quarry, about 3 of a 
milein all. This is illustrated 
in sections figs. 2and 3. These 
rocks are considered by Prof. 
Bonney to represent the ‘ Ar- 
chean” metamorphic series of 
the Lizard Head, which he di- 
vides into three groups, as 
under :— 
The micaceous or lower 
group, 
The hornblendic or mid- 
dle group, 
The granulitic or upper 
group. 
He thinks he can identify 
here the “ micaceous” group, 
containing in its upper part a 
stratum of granulite similar in 
character to the upper group, 
and also the middle or “ horn- 
blende” series, in which occurs 
the serpentine. This latter, 
he maintains, is decidedly in- 
trusive. 
Thus Prof. Bonney considers 
that two out of the three sub- 
divisions of his Lizard Archean 
series are represented here. To 
me the evidence seems all the 
other way. In the first place 
the rocks are very distinct, both 
chemically and mineralogically, 
as I shall show hereafter ; of 
much greater importance, how- 
ever, is the difference of strike. 
Q.J.G.8. No. 159. 
‘spavd Qog wey} ssoy Jo 
104} UIYIM popnpour st Aouuog “Jorg Jo soliog uvesypoty oy} Jo ,, (nowy snoedovorpy ,, LO AoMoyT OTT, 
“7 poyavur uorde 
eoueysip B ‘que 
461 
------ Ha Jo doy, 
Try Jo doy, 
= 
—> paul! ie 8 Quarry. 
_ : Hornblende schist. 
E 
a} 
= i 
io ------Serpentine. 
5, 
oS) arc Hornblende schist 
S 
+ 
© 
8 5 
1 Bera Serpentine. 
5 § 
5 | 
© 
B ----Hornblende schist. 
™m SS 
o| aX ii Renee Serpentine. 
@ 
= 
aH 
oO S \ 
= \ ii n---- Hornblende schist 
SAW 
2)! Whi P._Sexpentine, ee Red shal 
= SS ii 1” Serpentine. ad ny Sake 
= Sill | @icaceous Group jof,. 
: Si] 1 Prof. Bonney. 
1__.Fault No. 2. 
of Prof. Bonney’s 
Micaceous Group, 
---Granulitic group. | 
Non-micaceous base 
SS 
"SOPe[S VT[VYyIOg 
P Sole leedhent heh oteal -Porthalla. 
M 
"ygnos buayoo) ‘nynyrog mou sf fo woyongy—z *StiT 
(opr T=soypur gT oyeog) 
