"Basaltic lava flows border the accreted land to the north and east. The steep cliffs that form North Head Bluff are rocks of the middle Eocene (38 to 48 million years old) Crescent Formation. These rocks are ancient lava flows that erupted underwater and were later scraped off onto the North American continent. These lavas are more resistant to erosion than sedimentary rocks, explaining why they form such prominent headlands in an area otherwise dominated by sandy beaches." ~[ Ссылка ]
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