Alaska preparing supplies for the long journey on the Chilkoot Trail to the gold�ields in the Klondike. The Vining and Wilkes Warehouse built on pilings near the high tide line is visible on the right.
Alluvium (Holocene)-Unconsolidated deposits of the floodplains of major streams. Maximum thickness is several meters Alluvial fan deposit (Holocene)-Unconsolidated deposits at the mouths of secondary streams and gullies. As much as several meters thick Landslide deposits (Holocene and (or) Pleistocene)-Includes slopewash and talus in areas of slumped topography marked by numerous small and major headwall scarps. Displaced bedrock blocks shown locally within the slumped area where they are critical to interpreting the geologic relationships. A few meters to tens of meters thick Alluvial terrace deposits (Holocene? and Pleistocene)-Alluvial deposits of minor, undetermined thickness at several levels above the Gila River floodplain. Qt 1 , Qt 2 , and Qt 3 refer to relative levels of floodplain deposits, with Qt 1 being the highest perched deposit and Qt 3 the lowest above the present floodplain Highest perched terrace deposit (Holocene? and Pleistocene) Middle perched terrace deposit (Pleistocene) Lowest perched terrace deposit (Pleistocene) Gila Conglomerate (Miocene? and Pleistocene?)-Volcaniclastic fanglomerate and river gravels as much as 1,100-1,200 ft (about 300 m) thick in the deepest parts of the Gila Hot Springs graben. The base of the Gila near the head of Jordan Canyon, in the southeastern part of the quadrangle, is marked by laminated cross-bedded, pumiceous sandstone deposits (QTgps), as much as 100 ft (about 30 m) thick. Andesitic lava flows a few meters thick (Bearwallow Mountain (?) Andesite (Tba)) are interlayered in the lower part of the Gila Conglomerate near the junction of Apache Creek and Black Canyon
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