262 STRATIGRAPHICAL GEOLOGY. 



but by red compact feldspar and the Pequawket breccia, which occupies 

 a greater space here than in its other area east of the Saco. No ledges 

 of slate have yet been found upon Mt, Mote, while the breccia is full of 

 its fragments, inclined a few degrees northerly. On the north side a 

 porphyry makes its appearance underneath the breccia, followed by the 

 Albany, and then the Conway granite. The supposed continuation of 

 the latter sheet from Tamworth to Bartlett, beneath the other eruptive 

 rocks, is forcibly suggested by the position of the outcrops upon the 

 opposite sides of these mountains. 



The general arrangement of these granites agrees with what has been 

 stated heretofore, in respect to their topography. As a rule, the Conway 

 granite is overlaid by the Albany; while the Chocorua series and the 

 porphyries are never seen below either of those first named. The first 

 mentioned has the v/idest distribution, from the Pemigewasset valley to 

 the Green hills of Conway in one direction, and from the Sugar Loaves 

 in Carroll to Tamworth in the other. It is also the most abundant in the 

 East Branch and Saco valleys. , 



The principal Albany granite areas are these, and they fall mostly 

 within the outer line of the Conway: i. Mts. Welch and Tecumseh. 

 2. From Mt. Osceola northward across the east branch above Pollard's, 

 branching at Mt. Liberty, most of it passing north-easterly, encircling the 

 porphyry of the Twin range, crossing New Zealand river, and divided 

 into two parts by Mt. Tom. 3. A very small area in the north-east cor- 

 ner of Campton. 4. North of Mt. Carrigain. 5. East of Tripyramid in 

 Waterville, 6. Occupying the principal part of Albany, passing northerly 

 into Jackson, and easterly beneath Mt. Pequawket. 7. In the north part 

 of Jackson. 8. West part of Chatham. 9. North-east part of Jackson 

 (Mt. Sable). 10. Dykes between Tin and Thorn mountains in Jackson, 



Further study continues to increase the bounds of the Chocorua group. 

 The largest and most irregular is the one having Mt, Chocorua for its 

 main elevation, with a narrow spur reaching nearly to the Saco on the 

 north, and a broad overflow to the south in Tamworth. The others most 

 important are the Whitcface-Passaconnaway, Silver Spring and Tremont, 

 Giant's Stairs and Resolution, and one not mapped out embracing Frank- 

 enstein cliff. There are also smaller ones in Jackson and Chatham. 



0. Pcquaivkct Breccia. The production of this breccia is the latest 



