div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: dggsalaskagovdggsalaskagovwebpubsusgsioversizedi-0942sht01pdf · 2007-07-12 · Aggradation of the trunk valleys raised base level and caused tributaries from the unglaciated src=https:reader033fdocumentsinreader033viewer20220420005e6d655b57f1ff305613f891html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv