INDEX. 



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. 

 See Shawmut group; See Primordial series. 

 See Conglomerate and Slate. 

 Argillite, Montalban, 137-139. 



chiastolite in, 138. 



in Bellingbam, 147-148. 



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



Norian rocks in New Brunswick, 20. 

 Barton, Gr. 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) 



