70 REPORT—1863. 
On the Hornblendic Greenstones, and their relations to the Metamorphic and 
Silurian Rocks of the County of Tyrone. By Professor Harxyuss, F.R.S. 
The eastern portion of the county of Tyrone is made up of rocks, in part con- 
sisting of oma ereenstones, flanked on the north by metamorphic masses, 
and on the south by the Silurian beds, which have been described by General Port- | 
lock as being well exhibited near Pomeroy. The metamorphic rocks on the north 
and the fossiliferous Silurians on the south dip in opposite directions, and the inter- 
-yening hornblendic greenstones seem to form the axis of the elevation of the 
altered and unaltered rocks. These hornblendic greenstones are, in some localities, 
enetrated by granite. The author, from his observations in this part of Ireland, 
is induced to conclude that the metamorphic rocks in the north of Ireland, and also 
those of the Highlands of Scotland, have been elevated, flexured, and contorted at 
a period antecedent to the time when the granitiform masses were thrust into 
the metamorphic strata, and he is disposed, from the mode in which the granites 
sometimes exhibit themselves, to regard them as the result of an excess of meta- 
morphic action. 
From the mode of occurrence of the metamorphic rocks on the north of the 
hornblendic greenstone and the unaltered Silurians on the south thereof, he looks 
upon these rocks as appertaining to the same geological epoch; and Judging from 
the fossils of the unaltered Silurians, these rocks belong to the age of the Caradoc 
beds, a period to which the bulk of the metamorphic rocks of the north of Ireland 
and,the upper gneiss of the Highlands of Scotland are also referable. 
On the Fossil Teeth of « Horse found in the Red Clay at Stockton. 
By Joun Hoee, W.A., F.BS., Se. 
The author exhibited three fossil molar teeth of the lower jaw of a Horse, and 
remarked that few occurrences of Mammalia, in a fossi/ state, had been recorded in 
the adjoining counties of Northumberland and Durham; indeed, only once before 
the teeth of a Horse had been described. 
These specimens were dug up in the Red Clay of the New Red Sandstone to the 
south of the town of Stockton-on-Tees, and at a depth of 4 or 5 feet. 
The author also compared with them three molar teeth of a Horse, which he 
had found last autumn, with a portion of a human siull, in a field at Norton, where, 
in local history, it was related that a battle had been fought some centuries ago. 
It is the same field as that noticed by him to the Ethnological Subsection at Swan- 
sea, and mentioned in the Report of that Meeting. 
He further compared with the fossil teeth the corresponding molar teeth of the 
lower jaw of a recent Horse. ‘The fossil teeth differed from all the more modern 
ones by their strength, size, colour, and glazed exterior. 
On the Metamorphic Rocks of the Malvern Hills. 
By Harvey B. Horn, M.D., F.GS. 
The two most southern hills of the Malvern range consist entirely of bedded 
rocks, chiefly mica and hornblende schists, and gneissic rocks, having a nearly 
N. and §. strike. In the next, or Midsummer Hill, some thick-bedded rocks, com- 
osed of hornblende and felspar with a variable proportion of quartz and diorite, 
oth coarse- and fine-grained, are interstratified with gneissic rocks and mica schist ; 
the direction of the strike bemg more to the W. of N. and E. of S. In the next, 
or Swinyards Hill, the strike is due E. and W.: S. of the summit the rocks are 
gneissic and schistose, with some diorite and quartzo-felspathic rocks regularly in- 
terstratified; but, on its northern declivity, these are succeeded by massive and 
coarsely crystallized granitoid rocks, in which the mica is sometimes replaced by 
hornblende and epidote. The direction of bedding, though obscured, is traceable by 
means of narrow belts of more schistose rock, interposed at intervals, and lying in 
the plane of the general H. and W. strike. No veins proceed from these highly 
eel masses into the adjacent rocks. 
n the Herefordshire Beacon the rocks are again gneissic and schistose in struc- 
ture, partly micaceous and partly hornblendic, traversed by large quartzo-felspathic 
veins. These rocks are well exposed along the new pathway leading from the 
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