Proceeding in a westerly direction from Tammerfors, we stopped near the station of Siuro to examine some railway cuttings where good sections of gneissose rock and mica-schist, both of Pre-Bothnian age, occur. Macroscopically, the gneissose rock is distinctly and regularly foliated, having small, lenticular, streaks of quartz abundantly disseminated. Locally, however, the section in the field exhibits much contortion; and thin, irregular, veins of quartz, manifestly of secondary origin, are not uncommon.