orthoconglomerate

An orthoconglomerate is a type of sedimentary rock composed of rounded fragments, or clasts, larger than 2 millimeters in diameter. These clasts are typically well-sorted, meaning they are of similar size, and the rock contains less than 15% matrix, which is finer-grained material. The clasts in an orthoconglomerate are in direct contact with each other, forming a framework.

Orthoconglomerates are formed by highly turbulent water currents, such as those found on beaches or in riverbeds. They can be composed of a single rock or mineral type (oligomictic) or a variety of types (petromictic). Due to their high porosity and permeability, orthoconglomerates are important economically as they can hold significant water reserves.12