 So, so turbidites are really good example of how we can effectively use facies. And there is a geologist Bauma who labeled the different parts of a turbidite with names of facies. And we really commonly use that sequence of facies that he wrote out because turbidites have a very, very consistent pattern. And so Bauma was not very creative with his names. He used A, B, C, D, and E, okay? So the Bauma A part is this lower part where you have a finding upward of grains but no sedimentary structures. So this part is finding upward and massive. It often has an erosional base to this first part, okay? So B represents the component where you have a change in sedimentary structures. So he's defining his facie, defined his facies on both the grain size and the sedimentary structure. So this one is primarily planar laminated and his interpretation is that it's an upper planar lamination and it can be finding upward, may or may not be, but it usually has an abrupt change at the bottom. So the next component is the one with ripples here and that's C and this is a ripple, a current ripple, but usually just say ripple cross laminated sand, stone, and if you're going from the planar lamination to the ripple cross lamination that suggests the decrease in flow speed. Then above that is D, which is usually this poorly laminated, planar laminated, very fine sand to silt. And this boundary can be either sharp or gradational. I should say the ripple cross laminated is an abrupt change or a sharp change and that's because there's a really big distinction between the upper planar lamination and the ripple cross lamination in terms of the dynamics of the bed form. When you're going back into this poorly planar laminated sandstone that has a very low flow speed but the size is also decreasing so you can get some ripples in here and so this is often a gradational boundary. And then towards the top most of the silt especially at the top is just settling from suspension slowly and it grades up into the mud. So then you have a gradational boundary into E, which is the mudstone. And the mudstone is just the very fine grain sediment that is settling out as a background for the turbidity current between the turbidity current flows. So the main part of the flow that's represented as the turbidity current flow itself is the Bauma A through C parts where the water is actually flowing pretty quickly and then the D represents the sort of remaining silt size sediment that settles out and then finally the background sedimentation. So thanks for watching.