Arock inclusion in a basalt lava flow is dated at 56 ma. this means the lava flow must have occurred 56 ma.

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Explanation:

The rock inclusions are older than the rock that is surrounding them. In this case, we have a rock inclusion that is dated to 56 Ma. It is an inclusion in basalt. This means that the lava flow, as it was moving in that area managed to get the rock inclusion, and as the lava started to cool off, it consolidated and trapped the rock inclusion in it for time to come. This makes up for a very interesting appearance of the rocks, as there is the basis, being all from the same type of mineral, and then inside of the uniform rock mass, there is a totally different smaller piece of rock sticking out.