was named by William Bligh of HMS Bounty fame. Bligh served as Cook's Sailing Master on his third and final voyage, the aim of which was discovery of the Northwest Passage. Upon reaching the head of Cook Inlet in 1778, Bligh was of the opinion that both Knik Arm and Turnagain Arm were the mouths of rivers and not the opening to the Northwest Passage. Under Cook's orders Bligh organized a party to travel up Knik Arm, which quickly returned to report Knik Arm indeed led only to a river. Afterwards a second party was dispatched up Turnagain Arm and it too returned to report only a river lay ahead. As a result of this frustration the second body of water was given the disingenuous name "Turn Again". Early maps label Turnagain Arm as the "Turnagain River". The mineral resources of the Turnagain-Knik region are notable for gold placers and the gold quartz lodes. From 1896 to 1898, a large number of placer claims were staked on the streams tributary to Turnagain Arm from the north, and on a few of these claims, notably those on lower Crow Creek, mining was carried out in subsequent years. The output of placer gold was derived from the Turnagain Arm slope of the mountains. Development work on gold quartz lodes was confined largely to the Turnagain Arm basin. Geology The eastern portion of Kenai Peninsula and the region about the head of Turnagain Arm present a succession of rocks, which as a whole are of remarkably uniform appearance and composition. They are of sedimentary origin and consist chiefly of fine-grained gray and bluish-black slates and gray arkoses. Interstratified with these, but in far less amount, are quartzose beds and occasional thin conglomerates. In a few places north of Turnagain Arm this series of rocks, called by Mendenhall "the Sunrise series", is cut by dikes of igneous rock of an aplitic or granitic character. These igneous rocks were not found in the region immediately south of the arm. The whole rock succession is closely folded, and the arkoses as well as the slates show cleavage, which is, however, much more perfectly developed in the slates. Immense deposits of gravel occur at a number of localities, but are especially noticeable in the valleys of Sixmile Creek, Resurrection Creek, and Kenai River. The flat-topped benches have an elevation of nearly above sea level around the lower