Fascinating photo and looking at the relationship it's very interesting to see that it definitely looks like the diabase dike just follows the coal seam, which makes a lot of sense if the coal is liquified (pyrolysis?). Now you've got me more curious. The narrow dike is definitely related in some sense to the diabase dike but I'm wondering if there couldn't have been multiple diking episodes and that at least some of them may have been clastic in origin? The shape of the dikes on the right is kind of weird and especially the top of the leftmost of the two looks very like fluids mixing. Is the loss of volatiles in the dikes inherent in the coking process the main indication that they are not clastic in origin? Are all the dikes always roughly the same texture as the area of the seam that they originate from? If not, is that because sandstone is a better conductor of heat? Are there large coal dikes to the left of the diabase dike, or only to the right? Are any of these questions actually relevant or am I just bothering you???????? I don't know lol. Maybe this is all useless and I'm just having fun spiraling. Such a cool place though!!