The Geo-History of the Pacific Northwest

1. Geo-history of the
Pacific Northwest
BY AMY ANDERSON

2. Overview
 What constitutes as the Pacific Northwest.
 Basalt floods
 Great Lake of Missoula floods
 Wind floods

3. Where is the Pacific Northwest
 The area that is included in the
Pacific Northwest is very
debatable around the boarders.
The three main states that
make up the Pacific Northwest
include Washington, Oregon,
and Idaho.
 The landscape here was formed
by three major floods; basalt,
Great Lake Missoula floods, and
wind floods, creating a very
diverse and unique landscape.

4. Basalt Floods
 Thousands of years ago there was giant
volcanic eruptions that caused for basalt
floods that shaped the land of Pacific
Northwest. These basalt floods can be seen
in the land scape of central Washington.

5. Great Missoula Lake Floods
 Many years ago there was a
giant ice dam at Missoula
Montana that blocked this giant
lake of water. This dam broke
multiple times and the water
that came rushing through the
Pacific Northwest shaped out
many river cannels and other
landforms of the area.

6. Wind Floods
 One flood that is still
shaping the landscape
of the Pacific Northwest
today is wind floods.
Wind comes off of the
Pacific coast and flows
eastward shaping the
land as it travels
through the area.