Volcanics and volcanisedimentary rocks
The volcanics (extrusive or effusive magmatic rocks) resulted from volcanic action on or near the Earth´s surface, either as lava flows or as volcanic explosion (volcanic ash, lapilli, bombs). The products can be retransported to considerable distance. Volcanisedimentary rocks consist of a mixture of volcanic products and sediments. These two compouds can be mixed or deposited in alternating layers. Tuffite is a good example.
Exhibition detail no. 2410
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Česky 
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]