15 over a mile long and half a mile wide and consists of augite syenite that differs from the typical augite porphyrite in being even grained and some- what darker. A tongue of the stock extends southeast for about half a mile and pinches out in the form of a dyke. The fourth body is near the eastern edge of the Kitsault body west of LeRoy mountain. It is over a mile long and a quarter of a mile wide. Parts of the body consist of what appear to be lava flows of augite porphyrite with large augite phenocrysts; other parts consist of a breccia of large and small fragments of typical augite porphyrite loosely cemented in a sand that seems to have been de- rived from the augite porphyrite. The body is parallel to the strike of the enclosing sediments and probably represents lavas poured out at the time the sediments were being laid down. The Kitsault igneous body is 33 miles long in Alice Arm district and may continue much farther north. It is for the most part 3 miles or less in width but is 7 miles wide where widest. The outline of this body is much more complex than that of the other igneous bodies of the district. The Kitsault body consists mainly of various types of intrusive rocks, but also to some extent of extrusive rocks. The northern half, except for a strip of variable width along the east side, is of intrusive origin and contains numerous inclusions or roof pendants of argillite. Many of the inclusions are a hundred yards or more in length. One large inclusion on the northern slope of the valley of the west fork of Kitsault river is roughly triangular in vertical section with the apex pointing upwards and the sides measuring half a mile. This mass was probably formerly com- pletely surrounded by crystalline rock as the apex is below the top of the mountain to the north which consists of intrusive rock. The bottom of the inclusion is near the bottom of the valley. Large exposures of argillite seen farther north may also be inclusions or may be the prevailing rock cut by large bodies of intrusive rock half a mile thick. That part of the body crossed by Kitsault river is mainly intrusive. To the southeast between East and Goat creeks some of the rock is extrusive. The crystalline rocks of the northern half of the Kitsault body are divisible into two main belts formerly included in the Dolly Varden forma- tion (Hanson, 1922). One belt is locally known as the “ Copper Belt” from the fact that the mineral deposits in the belt are chalcopyrite deposits. The Copper Belt is about half a mile wide, In the north it forms the eastern part of the Kitsault body and extends from the north limit of Alice Arm area south to Evindsen creek where this band ends. To the west 1,000 or 1,500 feet up Evindsen creek the Copper Belt reappears and from there continues southward forming now the western part of the Kitsault body. It loses its identity a short distance north of East creek, The exact nature of the rocks composing the Copper Belt is unknown, but there is no doubt that much acidic feldspar porphyry much altered to sericite, calcite, and chlorite, is present in the north part and some feld- spar porphyry also occurs in the southern part. Tuffs, breccias, and minor amounts of tuffaceous sediments are also present. The Copper Belt rocks are light grey to greenish grey and are more sheared and otherwise altered than the other part of the Kitsault body. They appear to contain 88465—23