Sedimentary rock, rock formed at or near Earth’s surface by the accumulation and lithification of sediment or by the precipitation from solution at normal surface temperatures. Sedimentary rocks are formed by the accumulation of sediments. There are three basic types of sedimentary rocks . Clastic sedimentary rocks form from the accumulation and lithification of mechanical weathering debris. Examples include: breccia, conglomerate, sandstone, siltstone, and shale. Sedimentary rocks are a type of rock that formed through the accumulation and lithification of sediments , which are particles of rock, minerals, or organic matter that are transported and deposited by wind, water, or ice. Learn about sedimentary rocks in geology, including their origin, properties, and classification. Get examples and identification tips.