193 



by the Shubenacadie river. The altitude of the centre of 

 the district is 317 feet (96-6 m.). 



GEOLOGY. 



The quartzites and slates constituting the Goldenville 

 formation of the Goldbearing series (Pre-Cambrian) are 

 here exposed in a subordinate anticline 9 miles (14-5 km.) 

 long lying on the south limb of the Shubenacadie - Grand 

 lake anticline. The distance between the two anticlines 

 is a little over two miles (3-2 km.) and the intervening 

 syncline lies half a mile (o-8 km.) north of the Oldham anti- 

 cline. 



The fold which follows a ridge running east and west is 

 transversely symmetrical, the strata dip on both limbs at 

 angles varying from 50 to 75 , and the axial plane is nearly 

 vertical. The fold pitches to the east at angles increasing 

 to 45 , but two miles (3-2 km.) east of the centre of the 

 district, flattens out and disappears by meeting the syn- 

 cline on the north ; it pitches to the west at an angle great 

 enough to completely conceal the Goldenville formation 

 by the Halifax slate formation at a distance of 5 miles 

 (8 km.) west, and finally dies out also by joining the syncline 

 two miles (3-2 km.) farther at Wellington station. 



The anticlinal fold thus forms a long and narrow elliptical 

 dome pitching to the east and west. In the western part 

 of the dome the strata on both limbs run nearly parallel 

 with the axis of the anticline, but finally converge and curve 

 sharply within 10 feet (3 m.) over the apex; towards the 

 east the fold becomes gradually broader and the strata form 

 nearly concentric curves. 



The horizon of the quartzites and slates of the Golden- 

 ville formation exposed on the dome is estimated to be 

 4,560 feet (1,390 m.) below the base of the Halifax slate 

 formation, and as the thickness cf the latter formation is 

 11,700 feet (3,566 m.), a total thickness of over 16,260 

 feet (4,956 m.) of strata has been eroded off the dome. 



The dome has suffered much faulting especially in the 

 eastern part. An important fault follows the axis of the an- 

 ticline from the centre of the dome eastward, and attempts 

 to trace veins around the apex of the dome past the fault 

 have met with poor success. Radiating from the dome 

 towards the southeast is a series of important faults, two of 

 which have horizontal displacements 01112 and 124 feet (44 

 35063—13 



