Geology. | 275 
i operating the Fox islands, where the natural boundary between the 
owns was set up at an infinitely earlier period than that of the boulder 
oy for the rentog of the trap of North Haven broke through the granite 
and Taconic slates in a line wehlige peg to this tre iol 
th, as 
@ gigantic system of sculpturing, on the design that these, oe soul be di- 
rected towards the south. And furthermore, Rie hills, pees where 
west parallels, . debris whic n accumulated i > tases, 
but en ieee abies south a little ¢ Saudety atten more and yoni 
minute 
adva: 
The rein of ree coast is syenitic granite, bordered here and there hag 
a margin of trap or af Rb sp es slates, highly altered in places, and often 
verted into cherty flints as on Isle au Haut—and furnishes, from the pele: 
barrenness of the A nig a good opportunity to study the boulder phenomena. 
And this surface is 5 CORY Wnees eee | into furrows, often very deep and in the 
usual direction of the valleys, &c., resents the finest examples of em- 
bossed rocks as dbecrtbed by Charles i. Hitchcock in his Elements of Geol- 
ogy. This is so remarkably the case that one might, in the foggiest weather, 
easily point out north, south, sik , by na boop 95 at these mete for they represeae 
in minature, the hills and mou of the coast as ve des Sree 
ransverse indentations are pasa Ri common—/u mad furrows, I ro 
called them—from an inch in length to four and five feet, having ‘at horns 
pointing towards the northeast and northwest, and their steep walls Lag 
the south. These furrows, in all cases, are sufficient to tell the cardinal points of 
the compass as one passes along over t 
_Everywhere, too, the boulder strie may be found on the south sides of these 
hills at their bases, and on t a r sides when dipping at large or small angles 
wm the east or west, in finely veloped examples as are found on their 
northern slopes. It is a fact beyond COPMpOnSIEYs at the pouldes phenomena 
in the Penobscot bay are an character, and owe e to 
one agent and the same 
I have found these ede strie four hundred feet high on Be side of Isle 
au diges hill—which is five hundred feet above | the sea—and 0 n the pei grein 
wot M egunticook, t, a 
eres hundred feet above Camden harbor. Mount Bales south of that moun- 
n, the nearest to the village of any of those hills, an peop of quartz- 
~~ con Sneath is everywhere scored and scratched, pe has av y abrupt 
Southern face. Vast masses rast been torn fro ie a thie’ rection, 
to. 
There is a series of terraces in Vinalhaven, as you remember, seven hundred 
ising one above another, the last wall of which forms the highest 
yards long, rising 
margin of dell running nearly due north-south oken for four hundred 
yar m twenty irty feet deep, and fifty yards wide. This is a 
trough cut out of the solid eae: gi d splendid et ete of Na- 
Sere ‘s sculpturing with c she ded in days, 
beft prepare a barren country ba 
no y 
fi ag fe e worker, man. Towards t 
of this ri which” be prospect w and fifty feet above the sea, goon Lice: a 
high roak cverlooking the village, apparently in its native bed, presenting a 
Vertical wall towards the south twenty feet high above the soil, oy twenty- 
broad. No blasting by art, however carefully kiséacted; could perform 
a better operation. If this rock be a boulder, as you and I doubted, it must 
