INDEX. 



I 



Amygdaloid, exotic, 166, 175, 176, 198-199, 204, 205, 232, 238, 245, 247, 248, 268. 



in Saugus, 169. 



minerals in, 167, 169, 172, 173, 176. 



origin of, 164, 178. 



pebbles of, in conglomerate, See Conglomerate. 



relations to breccia, 165, 172, 173, 175. 



relations to conglomerate, 165-174, 248. 



relations to slate, 248. 



stratified, 165, 167, 174, 176. 



iSee Shawmut group ; iSee Primordial series. 



See Conglomerate and Slate. 

 Argillite, Montalban, 137-139. 



chiastolite in, 138. 



in Bellingham, 147-148. 



Bailey, L. W., Acadian geology, 8, 161. 



Norian rocks in New Brunswick, 20. 

 Barton, G. H., survey of supposed Devonian beds, 274. 

 Bellingham, altered conglomerate in, 145-153. 

 Boston basin, 183-267. 



age of beds in, 183, 184, 185. 

 not a single fold, 195-196. 

 overlap of Primordial beds in, 188, 207. 

 Primordial series in, 185. 

 relations to Narragansett basin, 273-276. 

 Boston Gas Company, artesian well of, 236. 

 Boston proper, underlaid by slate, 235-237. 

 Bouve, T. T., origin of granite, 36. 



petrosilex in Hingham, 92. 



relations of granite and petrosilex, 32. ' 



relations of petrosilex and breccia, 49. 

 Breccia, pinite in, 272. 



relations to petrosilex, 166, 168, 169, 170. 

 See Conglomerate and Shawmut group. 

 Brighton, amygdaloid in, 170-174. 



Primordial series in, 237-238, 245-249. 



(277) 



