The Past
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Geography
~ Enderby Cliffs
~ Floods
~ Geology of North Okanagan
~ ~ Bedrock
~ ~ Fault lines
~ ~ Ice Age
~ Naming of Enderby
~ Shuswap River
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As the earth aged, its surface changed.
Volcanic activity caused new rock to cover older bedrock. In the
area surrounding Enderby there are three main types of bedrock. These are: the Monashee
group - formed in the early Proterozoic Age; the Mount Ida group - formed in the late
Proterozoic or Pre-Cambrian Age; and the Kamloops group - formed during the Tertiary Age.
While this bedrock was forming, older and softer rocks eroded along cracks and exposed fault lines. These faults usually run along bases of mountains,
lakes, rivers and valleys; places where water can easily get into the cracks to expose the
faults.
The last Ice Age reached its peak 18 000 years ago. This ice cut
through stone and carved out valleys as it slowly advanced southward. It spread out to go
around mountains at a depth ranging from 5 to 10 thousand feet. As the glacier retreated,
about 10 to 13 thousand years ago, it filled in lakes that it helped carve. The glacier's
retreat to its modern size ended 6000 years ago.
Since this last Ice Age, there has been little change in the geographical features of our
area. The pressure of the ice on the Enderby Cliffs caused them to
press into the earth, but since this pressure has gone, the cliffs have been rising. The Shuswap River has become more sluggish and meandering since the last
Ice Age and erosion has taken some toll on the surrounding mountains smoothing them out
and making them into the mountains we know.
Kevin Early, Myrna Hannebauer, Dusten Tulak
ALF School 1989