296 



GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



to a result different from that reached where tlie underh'ing mass was 

 a nonfeldspathic scliist. I am inchued to give great weight, perhaps 

 the greatest weight, to the occuiTeuce of the same succession in beds 

 of about the same thickness — quartzite, mica-schist, hmestone — the latter 

 changing into hornblende rock, and to the tracing of the beds into such 

 close proximity rather than to the exact texture of the beds themselves. 

 The following description will emphasize the differences in the latter 

 regard: 



Below the fall at the mouth of Millers River, and on the north liank 

 of the latter, at a small crevice in the cliff, a fault is plainly seen (fig. 21), 

 the biotite-horublende-gneiss which formed the apron of the dam dipj^ing 

 10° W., against a flinty quartzite which dips 40° W. Following the 



^ E. outcrop along the river to 



i/fOApy I its north end, at a point 

 164 feet south of "The 

 French King,''^ we find 

 a marked promontory — 

 an island except at low 

 water — of the same jas- 

 pery quartzite, with high 

 westerly dip, which is sep- 

 arated by a narrow dike 

 of coarse granite from the 

 much older horizontal 

 Becket gneisses which crop out in the bank of the river and continue for 

 a long distance north. The unconformity is indicated in the above figure 

 (fig. 22). The rock at the promontory is a very peculiar quartzite, very 

 thin-laminated and corrugated like the grain of gnarled oak. Layers, which 

 sometimes swell to 10""", of black, flinty quartz, wavy and interrupted, alter- 

 nate with bands of white to oil-green, compact quartz, })roduciug a structure 

 which resembles the banding of some eruptive rocks more than ordinary 

 bedding. The rock can be followed south for 500 feet along the bank. 

 The ribboned quartzite changes into a coarse mixture of blue, greasy quartz 



Fig. 22. — Section on eaat bank of Connecticut Ri"' 

 Millers River at A on sketcli map, fig. 20. 



above montli of 



'A great bowldiT of Triassic conglomerate which lies in the middle of the river at the head of 

 the rapids, and derives its name, according to tradition, from the fact that the bateaux of the French 

 and Indians, during the French wars, were stopped here by the rapids, and one adventurous French- 

 man pressed on to this rock and brolse a bottle of wine over it, claiming the country in the name 

 of the French King. 



