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
Clue #1 This was made by people.
Clue #2 You might walk on this.
Clue #3 We found it at a lighthouse.
This is cement. This is where the lighthouse keeper stored fuel tanks. The tanks are no longer there. They have probably been reused somewhere else. The cracked cement is all that is left.