Antelope Island - Mostly shata of gneissic rocks = gneiss, conglomerate, quartzite, mica slate, etc. - The main peak is limestone in a thin stratum (20 ft or less), metamorphic tolady on each side, strike N 30° W magnetic, dip nearly vertical (varying 5° each way). The gneissic shata on each side are nearly conformable. From the main ridge a little south of the peak an alpine extends westerly which, beyond a prominent stratum of mica slate belonging to the main ridge, the composite mostly of a gneiss like rock with apparently a double strike & dip - one parallel with that of the main axis (N 32° W + which) - the other at right angles (S 58° W, dip 4° S) Stanbury Island - mostly limestone, with prominent shata of light colored quartzite. Strike not accurately deter- mind - some of the lower limestone strike on east side varied from N to N 50° W - a stratum of quartzite in the south end of the island ranged N 14° E. The highest peak is limestone & the mountain ridge forms an axial axis, dip about 70° in each direction. The limestone is frequently fossiliferous, standing in encirclings etc. The quartzite varies from a compact rock to granular conglomerate. The upper terrace line is marked by an abundant tuffaceous deposit. Carrington Island - mostly slate, with quartzite & con- glomerate - strike N 35° E, dip 73° W Black Rocks Bridge - Limestone. Peter Rock Point - limestone - strike N 50° W, dip 15° E Alum Bay - near lower point a dike of varicolored quartzite running easterly = above, slate, dipping about 25° E W.