volcanic arenite

Volcanic arenite is a type of lithic arenite, which is a sedimentary rock composed of sand-sized particles. Specifically, volcanic arenite is characterized by a predominance of volcanic rock fragments. These rocks are typically gray or have a salt-and-pepper appearance due to the inclusion of dark-colored rock fragments. Volcanic arenites are considered texturally immature and are often found in geological formations resulting from rapid uplift and erosion. They are common in various geological periods and locations, frequently interbedded with shales and sometimes coal or limestone.1