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What is that?

it looks like two sections of vertebrae

I wouldn’t be surprised if it is a dinosaur vertebrae. Cool find! Just wondering did you find it in moist dirt or rocky dirt

The area around Phoenix and Mesa consist of Proterozoic metamorphic rocks along with more recent (Miocene) volcanic activity. This looks potentially like a lava cast around a piece of wood. I see no resemblance to a vertebra and the geology of the area rules that out anyways.