Notes on the Maps.
The boundaries of the different beds are indicated as accurately as possible. Owing to the covering of soil and the consequent rarity of outcrops, conclusions as to the beds lying underneath are at times a matter for speculation. This applies specially to the beds on the east of Gold Valley, the middle portion of Gebbies Spur, the west of Gebbies Valley, and the valley at the head of Governors Bay. No trachyte dykes are indicated on the Mansons Peninsula map since they are too numerous for adequate representation considering the scale of the map.
C—Columnar rhyolite-tuff. The stick in the middle is just over 4 feet in length. The columns are from 4 to 6 inches in diameter. A cross joint-plane cutting the columns is seen to the right of the picture.