In geology, a sediment is defined as a collection of particles, loose or hardened materials that form on the Earth's surface (Selley 2000, 41). The study of sediments includes their provenance and the processes that lead to the deposition of the altered and eroded products of the older material. The purpose of sedimentology is to provide a deeper understanding of the history of the Earth. In a sediment, maturity is described as the degree of how much a sediment has changed due to weathering, transport, and reprocessing towards its final end product, quartz sand (Nichols 2009, 26). Sediment maturity can be measured in terms of consistency and composition. Texture in a sedimentary rock refers to grain size, grain shape, sorting, and rounding. Structural maturity is defined by the sorting and roundness of the sediment, while compositional maturity is a reflection of its quartz content. The maturity of a sediment or sedimentary rock can be represented as shown in Figure 1. There are four types of structural maturity; immature, submature, mature and supermature. Structurally immature sediments are those that comprise primarily matrix and contain small amounts of grains in the rock. The grains are generally poorly sorted and angular (Tucker 2001, 20). A rock composed of mud-, silt-, and sand-sized materials such as greywacke is considered structurally immature. An indication of a structurally immature sediment is that the distance of its transport may be short. A sediment is considered submature when selection is moderate to poor. Submature grains are generally smaller and appear to be slightly more rounded than immature sediments. Structurally mature sediments are those in which there is little matrix and have a moderate to good grading range and subrounded to rounded grains. Mature grains are usually often more rounded and have greater sphericity than immature and submature grains. Structurally supermature sediments are those without a matrix, have excellent selection and are made up of well-rounded grains. Because quartz is hard and non-flaking, it is commonly the last survivor and is resistant to changes in a turbulent environment (Skinner, Porter, and Park 2004, 178). A rock made up of well-rounded quartz grains of narrow size would be very mature. The determination of the structural maturity of a sediment is independent of its composition since it is influenced largely by its depositional processes, although it can be altered by diagenetic processes (Tucker 2001, 11).