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It’s the sturdy metamorphic rock that underlies the Los Angeles Basin, “the bedrock of this whole area,” Coffey says.

It’s a metamorphic rock, which means it becomes something new under extreme heat and pressure without melting.

The person with knowledge of the matter said that the group’s name derived from the metamorphic rock, signaling the group’s intent to be enduring and maintain a clarity of purpose.

Equipment designed for the softer, cooler sedimentary rock often found in oil fields falters in the extremes of hot, hard metamorphic rocks such as granite.

Marble, the metamorphic rock, embodied for me a dark paradox: It is change that produces changelessness.