The youngest bedrock formations in Kachemak Bay are exposed on the north shore. They formed about 23 to 1.8 million years ago. Older sediments are found in the hills above and north of Homer, in a thin band of seabluffs from Bluff Point to around Troublesome Creek. A slightly wider band of seabluffs exists around McNeil, Cottonwood, Eastland, and Falls Creeks. In places, these deposits are almost one mile thick.

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