[Arrowhead1952]

You suppose that ash layer is that grey layer we see in limestone cutouts on our way to work on 1431 and 360?

¿¿¿ Might be..... There are a lot of places I've seen that grey stuff.

[txhurl]

That grey layer is like three inches thick... and that’s with compaction of more (70 million years?) of limestone, which is composed of the exo-skeletons of plankton and whatnot.

Hope this baby doesn’t blow again.