This crater like trap was used for the primitive local oil industry. The lighter fractions were burned off, and when the oil reached the desired consistency, it was drained off using an underground channel. 1926 ARC224931_3429 Copyright: BP plc.

This crater like trap was used for the primitive local oil industry. The lighter fractions were burned off, and when the oil reached the desired consistency, it was drained off using an underground channel. 1926 ARC224931_3429 Copyright: BP plc.

This crater like trap was used for the primitive local oil industry. The lighter fractions were burned off, and when the oil reached the desired consistency, it was drained off using an underground channel. 1926 ARC224931_3429 Copyright: BP plc.

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