Sentinel Gap Ice Age Floods Features
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Panoramic Columbia River view from top of Sentinel Gap (east bluff). Video shows basalt boulders below Sentinel Gap that dropped out of the Ice Age Floodwaters as they flowed into the Pasco Basin. Ice-rafted erratic boulder is also shown.
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I need to get out more. Thanks for these videos.
Why aren't the boulders (1:05) more rounded like the "Melon Gravel" from the Bonneville Flood.
Are the “boulders” erratics or bedrock?
@clickhorizon
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Bedrock would be underlying rock. Erratics rocks carried off by glacier ice and dropped somewhere. I suppose bedrock it might have been, but at some time in the distant past.