Cordilleran ice advanced southward into the Puget lowland across southeastern Vancouver Island about 18k 000 years B. cordilleran The sheets ice sheet advanced to the western Strait of Juan de fuaca by about lobe 17 to the Seattle area after 15, 000 years BP 000 years sheets BP. okanogan cordilleran relationships to the Cordilleran Ice Sheet ( CIS). Purcell Trench Lobe. Okanogan lobe cordilleran ice sheets. The south- westernmost extension of the Cordilleran ice sheet was known as the Puget lobe. 5 ka flowing down the northwestern Columbia River valley prior to blockage of this route by advance of sheets the Okanogan lobe okanogan of the CIS, which dammed glacial Lake Columbia diverted later Missoula floods to more eastern routes through. One of the larg- cordilleran est floods occurred okanogan at 18.
A dramatic landscape sculpted 15, 000 to 12, 000 years ago by the Okanogan Lobe of the Cordilleran Ice Sheet, this area has basalt cliffs, rolling hills peppered with basalt " haystack rocks", low buttes that overlook the Columbia River, riparian draws, permanent and seasonal creeks, and rugged slopes filled with Ponderosa pine. The Cordilleran Ice Sheet buried everything from the Pacific Ocean to what is now Montana and north as far as Alaska. The Okanogan lobe of that ice sheet is what provided so much beauty in our region. Location of Glacial Lake Columbia Glacial Lake Columbia was the lake formed on the ice- dammed Columbia River behind the Okanogan lobe of the Cordilleran Ice Sheet when the lobe covered 500 square miles ( 1, 300 km ) of the Waterville Plateau west of Grand Coulee in central Washington state during the Wisconsin glaciation. Cordilleran Section of the Geological Society of America, Denver, CO. Cosmogenic - Nuclide ages from the Okanogan Lobe of the Cordilleran Ice Sheet and associated outburst flood erratics.
okanogan lobe cordilleran ice sheets
Geological Society of America Abstracts with Programs, Cordilleran Section, 103 rd Annual Meeting. The Late Wisconsin Cordilleran Ice Sheet. paleo ice streams in the form of well- developed MSGLs was also recognized on the bed of the Okanogan Lobe near.