Glacier ice overflowed the valley wall at about 900 m altitude north of Atigun Canyon and formed a lobe that spread westward for at least 5.5 km into the headwaters of the Toolik River.
(Glacier ice; overflowed; the valley wall; L:at about 900 m altitude north of Atigun Canyon) (Glacier ice; formed; a lobe that spread westward for at least 5.5 km into the headwaters of the Toolik River) (a lobe; spread; westward; for at least 5.5 km into the headwaters of the Toolik River)
Glacier ice Glacier ice a lobe
overflowed formed spread
the valley wall L:at about 900 m altitude north of Atigun Canyon
a lobe that spread westward for at least 5.5 km into the headwaters of the Toolik River
westward for at least 5.5 km into the headwaters of the Toolik River