FROM THE KENDAL AND SEDBERGH DISTRICTS. 179 
narrow dyke at the base of the Coniston Flags, near to a rather 
salmon-coloured indurated slate in the upper part of Westerdale. 
Tabulating the above results, we accordingly have the following 
classification of these mica-traps, though it must be remembered 
that some of those named minette-felsite are probably near the 
plagioclase group. Indeed the majority, as will have been seen 
from our examination, cannot be considered very typical examples 
of the species to which they are referred :— 
Minette. No. of description. 
Cross Hawebeck: Sager. Daya! 
Kersantite. 
SCOR MeN mi acer cent ser creat Smeg rele (9) 
NOE Ca NGallaey Herre ce teem nt hades (11) 
Diorite (micaceous). 
SPR ATM ye ea eho Pes a5 in) coon nege faa (3) 
‘Stil leecareyale era ee dretstel ae ie daleeen Naveen Ot Selena (4) 
Minette-felsite. 
Near Windermere Station ............ (1) 
iKendalyioadeatacscnirsn henhdl. avs bye testa (5) 
RioilwaveWocker) Garbliseh<:iacierat. sien (6) 
Southiot Mayearths. Geis am se oe. (7) & (8) 
Jelelbent Cole assed en ere eet (12) & (13) 
Backside: Becks cna) sbi) noc 648d .. (15) 
Kersantite-porphyrite. 
Widalémiicade ye Bas, Peibhce hue a (10) 
Wet AG WIR S Ay 2 EES Sanita aie, (16) 
Wrfesbondellery.se Sonat! Mts Hy hats hy Mis (17) 
Porphyrite. 
BATIOVEDTIO2 OC: deuce ahs aes elec ate (2) 
One remark only need be made in conclusion. It has been sug- 
gested that possibly some of these mica-traps may not be true igneous 
rocks, but the result of metamorphism, by the assimilation of por- 
tions of the adjacent sedimentary rock, through the action of gases 
or of hot water (holding various minerals in solution) communicating 
along lines of fissures with the joints. The cases which we were able 
to examine in the field did not appear to favour this view ; andif any 
contidence can be placed in microscopical investigation, there is nothing 
in fayour of and every thing against it. Ifthe word igneous be used in 
its ordinary sense, there need not be the slightest hesitation in class- 
ing these mica-traps with the igneous rocks. From the above 
descriptions it would seem probable that most of them solidified at 
no great depth. Hence, as their geologic age is certainly later than 
the Upper Silurian, and is very probably Precarboniferous, we should 
be disposed to refer them to some part of the Old Red Sandstone 
epoch, and that probably not the earliest, connected, it may be, in 
some sort with those volcanic disturbances which have left such con- 
spicuous monuments in Scotland. 
