Some of Earth’s first animals—including a mysterious, alien-looking creature—are spilling out of Canadian rocks. The drumming of the jackhammer deepens. Then, a block of shale butterflies open, exposing to crisp mountain air a surface that hasn't seen sunlight in half a billion years.

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Some of Earth’s first animals—including a mysterious, alien-looking creature—are spilling out of Canadian rocks. The drumming of the jackhammer deepens. Then, a block of shale butterflies open, exposing to crisp mountain air a surface that hasn't seen sunlight in half a billion years.