A timeline of the Cascade Pass from 15,000 years ago to the present.
North Cascades National Park, National Park Service
by R. Mierendorf and J. Kennedy, 2009
The events below, based on calibrated radiocarbon ages, are in calendar years before present:
Glacier ice melts out of the pass.
Early indigenous people camp at the pass and make and repair stone tools, some made from locally-collected stone. Other tool stone is carried in from distant sources, including Hozomeen chert from the upper Skagit River to the north and the Columbia Plateau to the east.
Intensive use … » More …