. Acadian geology : the geological structure, organic remains, and mineral resources of Nova Scotia, New Brunswick, and Prince Edward Island. Geology -- New Brunswick; Geology -- Nova Scotia; Geology -- Prince Edward Island; Paleontology -- New Brunswick; Paleontology -- Nova Scotia; Paleontology -- Prince Edward Island. USEFUL MINERALS. GOLD, 629 the containing rocks when in a hard and metamorphosed state. Tlicy have been formed and filled in the very act of the contortion and altering of the strata, and arc thus of the nature of segregation veins, gradually formed as the spaces containing th
. Acadian geology : the geological structure, organic remains, and mineral resources of Nova Scotia, New Brunswick, and Prince Edward Island. Geology -- New Brunswick; Geology -- Nova Scotia; Geology -- Prince Edward Island; Paleontology -- New Brunswick; Paleontology -- Nova Scotia; Paleontology -- Prince Edward Island. USEFUL MINERALS. GOLD, 629 the containing rocks when in a hard and metamorphosed state. Tlicy have been formed and filled in the very act of the contortion and altering of the strata, and arc thus of the nature of segregation veins, gradually formed as the spaces containing thcna were opened out, by a process so slow and gentle that the containing beds were bent without fracture and with but little crushing. The barrel quartz is most instructive as an illustration of this peculiar mode of formation, which must have often occurred in the disturbance and metamorphism of sediments; though geologists, from the habit of looking exclusively "ht fissure veins on the one hand, and beds on the other, have often been puzzled by these apparent anomalies which occur in the case of what may be termed contemporaneous veins following the strike of the enclosing beds, and which, while simulating beds, and obviously not filling mere rents or fractures opened in hard rocks, must have been produced by forces acting long after the original deposition of the containing strata. Fig. 219.—Section of Vein o/^Bairel Quartx," Waverk)/.. (a, a) Quartz vein, with contorted slate below and quartzite above. The minerals associated with the gold at the Waverley Mines are mispeckel ( of iron), galena (sulphide of lead), blende (sulphide of zinc), and, more rarely, iron pyrites, copper pyrites, and calcareous spar. The visible gold appears in irregular grains and nuggets, included in and attached to the mispeckel, galena, blende and quartz, in such a manner as to show that it is in all cases either of contemporaneous or later introduction, and it has prob
Size: 2137px × 1169px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthordawsonjohnwilliamsir1, bookcentury1800, bookdecade1870
