244 On the Geography and Geology 



has been mentioned as occurring nine miles and a half from the 

 Otter's Head. Short intervals of the granite having occurred, 

 two other masses of this greenstone, 50 yards broad, and 50 feet 

 high, are met with westwards ; similar in direction, 4'C., to the 

 larger mass first spoken of. The rocks about the Otter's Head 

 are often mural, though not high ; and are dark coloured granite (?) 

 Both the granite and the greenstone of this locality contain calcspar 

 in large masses and veins : and it frequently coats fissures. There 

 are many fragments of mountain limestone on the beaches of this 

 district. 



The rocks of the coast between the Otter's Head and two miles 

 and a half from the Peck River, differ from those between the 

 Otter's Head and the crags in the absence of stratified greenstone, 

 and in the somewhat diminished frequency of the trap veins. The gra- 

 nite likewise, in many places, loses nearly, oi* totally, its hornblende; 

 it being then white, coarse granular, perfectly unstratified, except 

 where from minute and short interleavings of hornblende it assumes 

 the form of gneis. At the Lesser Written Rocks, from thence for 

 seven or ten miles south, and nearly to the Peak westwards, the 

 rock resembles that of Huggewong, being very pale, and abounding 

 in large contemporaneous masses and veins of porphyritic granite, 

 and its irregular imbedded masses of hornblende, mixed with 

 quartz, and traversed fantastically by seams of granite. Veins of 

 white quartz from one to fifty feet thick are frequent here, coated 

 by films of epidote occasionally. The veins are about and beyond 

 the Lesser Written Rocks, in great numbers ; never, indeed, being 

 wanting for a great space. I believe them to escape observation 

 frequently from their more common direction being hereabouts 

 parallel to the route of the traveller. 



The appearances which I have supposed to be veins, or dykes, 

 are first seen in the crags of Michipicoton near the west end* (not 

 noted before), and, lastly, in the base of Thunder Mountain. In 

 this very extensive range their characters are unaltered, although 

 they traverse granite, greenstone, sandstone, and limestone. They 



* With the exception, perhaps, of a fair example near Gravel River in a 

 granitic district. 



