On Rocks and Minerals from the Karakoram Himalayas. 483 



ever (left side), and on Emerald Peak, the strike is N. of E.N.E., the 

 dip southerly 30 to 75. 



The next set are from the valley leading to the Gilgit river from 

 Chalt. The geology of this region was investigated by Surgeon 

 Captain Giles. Here Mr. Conway took but few specimens (fdiorite 

 and fhornblendite) , and remarks that the rocks are similar to those 

 of the Bagrot Valley. Approaching and passing Chalt, fcrystalline 

 limestone in situ and a fchloritic rock occur ; the strike of these 

 varies from 8 E. of S.E. to 13 S. of E., the dips being northerly 

 from 50 to 85. It is noted that much nearer Gilgit the strike of the 

 rocks was E., with a varying dip, and that on going northward it 

 bends round to be a little more nearly in the direction of the valley. 



The next set of specimens represent the rocks between Gulmet and 

 Shaiyar ; they are f sc histose calcareous grit, ffine-grained gneiss 

 (both sides of the river), a fgranulite, a fcrystalline limestone, a 

 t micaceous gneiss (at Shaiyar), and as loose specimens, garnets, 

 common near the crystalline limestone, a felstoue (Gulmet), and 

 black garnet-schist (abundant). It is highly probable that we have 

 in this region, as in parts of the Lepontine Alps, a series of gneissic 

 rocks overlain by a group of crystalline schists, probably meta- 

 morphosed sediments, over which comes a newer series of compara- 

 tively unaltered strata. The strikes at this part are stated to be 

 " parallel with the valley near Gnlmet, the dip being 30 in a southerly 

 direction"; above this they vary apparently from E.N.E. to E.S.E., 

 the dips being generally on the southern side, from 20 to vertical. 



In the Samaiyar Valley, below the glacier, are a ffine-grained 

 gneiss, fgranite (left side, west of camp), and, from fallen fragments 

 on the same side, a schistose (?) dipyr rock, crystalline limestone, a 

 mica schist (with some secondary mica), and a schistose grit (brought 

 down abundantly by avalanches). The character of these rocks 

 suggests the possibility that the granite is intrusive in the sedi- 

 mentaries. The strikes in this part of the valley vary from 5 N. of 

 N.E. to 7 S. of S.E., the dips being very high, generally from 85 to 

 vertical. Along the Samaiyar glacier, on the left bank, is a fsome- 

 what micaceous gneiss. On the right, near Trough Camp, is a fmica- 

 ceous conglomerate, which recalls some rocks of Huronian age in 

 Canada. On the same side, near the east end of " Trough Saddle," is 

 a ffine-grained gneiss (common down the left moraine of the glacier). 

 The strikes below Trough Camp are between E.S.E. and 10 S. of 

 S.E., dip southerly 55 to 80, but at the east end of " Trough 

 Saddle " the strike is nearly N.N.E., the dip vertical. After return- 

 ing to the Nagyr Valley and ascending to Hopar, there come, beyond 

 it, a t nne -g ra i ne d gneiss, a fmica-diorite. and as loose specimens 

 along the left side of the Nagyr Valley, and of the Bualtar glacier 

 (apparently from the Crown of Dirran), diori.tes ; from the medial 



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