Classification of Sedimentary Rocks Part 1: Terrigenous/Siliciclastic Rocks

We now know what sedimentary rocks are, but how do we classify them? We have to discuss three broad categories of sedimentary rock, and the first of these are terrigenous or siliciclastic rocks. These are rocks composed of clasts, or fragments of silicate minerals, derived from the erosion of preexisting rocks. Further categorization can get pretty tricky, requiring interesting looking ternary diagrams, so let's get a closer look now!