 Here are a few grains from our Bodega sample and you can tell that they have a variety of compositions by the differences in color and they have different amounts of rounding. And so we have the grain size chart at the top which has the rounding and we'll start by looking at some well rounded grains. So for example this one right here really doesn't have any sharp edges on it at all. Here's another example of one that's a little bit smaller but still well rounded maybe on the rounded side. Other grains have a lot of sharp edges and you can see for example there are a couple of them here, here's another one here. If that's a grain it's very angular with those sharp points. And we can look at some that are for example sub rounded. So the points sticking out are smooth but they still have some of those edges coming out. So what would be a good example of one of those grains? Let's say this one right here is a good example. Here's a big example of a sub rounded grain. So the way you go from angular to well rounded is by the grains colliding against each other and breaking off all of these little sharp points on the edges of them. And so typically angular grains are ones that have recently been produced by weathering of the rock and well rounded grains have experienced quite a bit of rounding. I'd like to point out some grains too that don't really fit in this pattern. And that's the ones I just circled here in blue. They're two grains and look they have the same shape and they're actually connected to each other. And these grains are actually fragments of Coraline algae. So these are basically algal skeletons. And these are often pink if they still have some of the organic matter in them and the pigments from when they're alive. And these are again Coraline algae and they are, they grow rounded. So in this particular case the grains don't actually tell you much about the transport process. If they had been transported a whole lot though these two grains would have broken apart when they would be separate. Alright, thanks for watching.