NOTES AND QrERTES. 
311 
oil one or two points, principally as to the formation to which the sandstone 
near the Ardwick limestone beds belongs. He could not see what objec- 
tion there should be to insert a little strip of lower red sandstone of the 
Permian formation there. This he has done himself in the map published 
by the Geological Survey, and he tho'jght the reasons for doing so out- 
weighed those for the opposite course. He also considered that the Irwell 
Valley fault ought to be continued to the Mersey, at Heaton Mersey ; 
and the eastern boundary fault of the Manchester coal-field to Stockport. 
Also, that there was a second bed of boulder clay lying above the sand and 
gravel ; but in his general views on the subject of the drift, he fully con- 
curred with Mr. Binney. 
as yc 
at Ci 
NOTES AND QUEEIES. 
The Geanite Eocks of Donegal is a subject that has been taken up in 
a determinate and able manner by Mr. Eobert H. Scott, the Secretary of 
the Geological Society of Dublin, and several valuable yjapers on it have 
been read by him, and have been published in the ' Dublin Quarterly 
Journal of Science.' He points out the very remarkable fact that the so- 
called igneous rocks of Inuishowen are contemporaneous with the sedi- 
mentary rocks of that district. " In the north of Innishowen," he says, 
" the cliief rocks observed were grits, crystalline limestone, mica slate, and 
a variety of greenstones and syenites, passing by insensible gradations into 
the two distinct types of syenite of Ardara and Horn Head. The whole 
of these rocks are contorted considerably about Culdaif, and from that 
to Malin Head they exhibit a consecutive section, of which the dips increase 
'ou go westward, the beds being nearly horizontal (dip 20° to 25° E.) 
'uldaff and along the shore towards Glongad Head, and consisting of 
grits, interstratified with igneous rocks. ... It is very remarkable that the 
igneous rocks, to which allusion has already been made, as being found in 
great abundance in the county, in Innishowen, are undoubtedly contem- 
poraneous with the sedimentary rocks of the district. This fact is ob- 
servable along the coast, but it is noticeable in the most striking manner 
between Buncrana and Carndonagh, about five miles from the former 
place, — the whole of the hills lying between Slieve Snaght and the Eaghtiii 
mountains being composed of alternating beds of quartz rock and syenite, 
dipping at a low angle to the eastward. This is beautifully exhibited in 
the mountain of Binmore or the King of the Mintiaghs, lying in the dis- 
trict called the Barr of Inch, close to the Mintiagh lakes. ,3 , 
This hill, with its consort, the Queen, form a very strik- ; 
ing feature in the landscape, when seen from any point ; 
in the noi'thern part of the count}'-. . . . These hills and ''-.,1 ; ' 
the mountain Bulbin are terraced like the tnip hills }' 
of Antrim and the coast of Argyllshire ; but on a close '-^iT^ 
examination, it is found that, though the conclusions 
drawn from the terraced form are further borne out by 
the fact that all the beds are columnar, yet they consist '' ^-'l > "'^^ 
of alternate beds of quartz rock and syenite, as before €^.?y'' \ ;f \ 
described. The columnar structure of the former is ! ;n} 
due to the simultaneous development of three series Joints in King of the 
of joints, inclined to each other at angles approaching Mmtiaghs. 
those of a regular hexagon. These joints are all of them traceable in 
other parts of the county ; but it is only here that they assume a deve- 
lopment of such equal importance. 
