- [Voiceover] This is another approach. This is the basin volume approach, and this is probably the oldest of the bunch, but it's also seen lots of work as of recent in terms of modifying it and improving accuracy. But the principle here is very simple, is you look at the depositional basin and see the total amount of sediment that was actually delivered, was actually deposited in the basin. You backtrack after calculations of the volume and say very simply the source must have generated at least that much sediment. Of course the problem is the sediment tends to get advected out of the basin and washed off into the ocean by currents and so forth. So you never know how much sediment you've actually lost from the sink. So the amount of, backtracking the amount of sediment that's generated by the source can be a little bit tricky because you have to kind of assume that the sink was closed in order to be able to make an accurate estimate of the amount of sediment delivered from the source, from estimates of sediment volume in the sink. Sometimes that works, sometimes it doesn't. And there's some other work here, like Somme's work, that simply makes some assumptions about how much sediment is generally lost to try to correct for that. I think that the general trend that you should be seeing as we go along here is that this is an embryonic science. And we have a lot of inaccuracies in this. But that said, what would be very powerful for exploration is if you're trying to do basin models for how sedimentary basins fill, one of the fundamental variables that you would like to have is the total amount of sediment actually being delivered to the basin and the rate that sediment is coming in. Without that input it's very difficult to really do an accurate model of basin filling. And so anything we can get in terms of trying to figure out the sediment supply delivered to a basin that generated a rock sequence is a very good thing to have. But once again, you're talking about trying to reconstruct something that has already come and gone, and the only record you have is the deposition in the basin and the erosion surface updip that may or may not still be there, so you're dealing with very incomplete data sets. And so the estimate approaches that we have made, all three of these, are very coarse and very approximate. That also creates, we also have another problem with existing methods as well, is most of them again are very data hungry and they oftentimes don't use the kind of data that we collect. Cause we collect seismic data, core data, and well log data in the subsurface. And so those are the things that are at hand. So what we really need is an approach to trying to figure out sediment source to sink supply and how much sediment is being delivered to our basin that actually builds off the kind of data that we tend to actually collect.