Distribution of Grain size with depth in dikes

The caterpillar theory of plate tectonic movement predicts that just as we see cracks developing in soil that has dried up, so we expect to see much larger, deeper & repeated cracks developing from the surface downward, one new set for each ice-age perhaps as much as 1-2km deep.
The following video shows that (some) sedimentary dikes were not created in a single event, but instead consist of repeated events whereby the cracks expand and then are in-filled essentially with surrounding material. This suggests that there is some kind of cyclic event, each additional layer represents a new cycle.
This appears to be very good proof supporting the caterpillar theory of plate tectonic movement which suggests a significant part of plate tectonic movement is caused by thermal heating and cooling over longer term ice-age cycles. Just as we see cracks developing in soil that has dried up, so when the crust cools over the 100,000 year ice-age period, the crust will shrink from the surface and so we expect to see much larger and deeper cracks than those from dry soils developing from the surface downward, perhaps as much as 1-2km.
Therefore it seems likely that each of the following layers represent one ice-age period.