442 Green— On Ice-scratches in Derbyshire. 
At c are a few grooves on chert running E. 19° §. The chert- 
patches at D and E are the best marked of all, the grooves and 
scratches being very regular and distinct, in a direction N. 30° E. 
Fig. 3 is a sketch, half the natural size, of a bit of the rock broken 
off from E. : the side turned to the light is beautifully polished and 
grooved ; the side in shadow gives a section at right angles to the 
polished face, and shows how the chert-nodule, which is marked by 
the darker shading, has been worn down and polished. Lastly, we 
Fic. 3. FRAGMENT OF ROCK, GROOVED AND POLISHED BY ICE. 
have the largest polished face, rr, dipping E. 40° N. at 15°: the 
grooves and scratches run E. 40° S., and are crossed at & by a set of 
finer markings, running over a highly polished face of chert in a 
direction E. 40° N. In the section the dotted part is limestone, and 
some chert-nodules are introduced, which in the interior of the rock 
have their usual irregular shape, but on the surfaces B and F have 
had their upper faces planed down and scratched. 
Now, it seems to me that these markings must be one of two 
things—either ice-scratches or ‘ slickenside.’ If the latter, one would 
expect the markings to show some regularity in their direction, 
which they do not, for there are at least three distinct sets of 
scratches: nor can I conceive a fault or fracture running through 
chert-nodules, so as to slice them in two and then polish the faces 
against one another. 
But the irregularity of direction, on the other hypothesis, 
may be easily explained by supposing different masses of ice at 
different times moving in different directions; and the planing down 
of the chert-nodules is just what we know ice will do. I may add, 
that among the heaps of stones gathered from the fields, and in the 
walls, a little higher up the hill, I found two ice-scratched bits of 
Mountain Limestone; two blocks of quartz rock, one angular, the 
other partly rounded, which were certainly foreigners; and many 
rounded lumps of two varieties of greenstone, one of which was 
most likely toadstone, but the other was unlike any toadstone I know 
of, and was, I strongly suspect, a stranger. 
TIT. On Preevacrat (?) Drirt In QueEn’s County, IRELAND, 
By G. Henry Kinanan, F.R.G.S.1. 
¢ Pee Coal-measure hills that form the outer margin of the 
Castlecomer table-land are generally covered with local drift ; 
but the drift on nearly all the other Coal-measure hills is largely 
