 You make of this Irene well, I see over here. There's some rock stuck in the sandstone Yeah, really pretty ones too. Aren't they you could take one of those out and polish it up and make fair earrings There's something out of it. They're agates They're not petrified wood as far as I can tell but they're the same material as the petrified wood And they're sitting here in a sandstone just like the one you were chatting out about a bit And if we look at this sandstone, we can see the layering in it the cross bedding But these are not the big cross beds of a windblown sand dune These are the little curving cross beds of a stream of a river and it was a stream or river that could roll gravel So these are pieces that have come bouncing down this stream. We can see that they're a little bit rounded You know, they've been in the stream and they've been bouncing around but they're not really round it They're still some rough stuff. They sort of semi-rounded is the term for it And what that probably means is that they're being eroded out somewhere fairly close here They they're formed Or they're knocking out they go a little ways in the stream and then they're forming again We know that sort of everything that way for a long ways is about the same age It's about the same sediments these can't have come from some mountain range way way far away or they'd been really rounded Yeah, and the only thing that way that where this stream is coming from Is the same sort of sediment so that says that there was agate forming in these sediments where the petrified wood formed Even without wood and that in turn says that the groundwater is really Desperately wanted to deposit quartz. They want to deposit little crystals of quartz and when they had wood to deposit it in They put it in the wood when they didn't they put it somewhere else They put it in little pockets in the in the mud or something like that But the petrification, you know, why do you get silica going in for the wood? This is ultimately telling us that the groundwater really had silica that it wanted to get rid of the hardwater Deposits that it wanted to make were little quartz crystals. Oh Was it desperate to get rid of tell us when tough? All right, so what do you make of this Irene? I don't know we see some Different rocks here. They have to have been formed right in these rocks that are around us Probably very near the surface very quickly after mugs were put down and then they were picked up again and moved a little ways And then put back down here They're coming from slightly older rocks, but not much because there's a little of this but not too much difference So now What can we say this is the same stuff as the petrified wood? And we can see just by looking at this and what we know about the rocks that this had to be forming right in The mugs where the petrified wood formed