Evcp: Volcaniclastic rocks—Lithic and feldspatholithic volcanic to tuffaceous sandstone, silty sandstone, and siltstone containing some interbeds of volcanic (pebble) conglomerate, tuff, lapilli tuff, breccia, shale, organic tuffaceous siltstone, and coal; leaf fossils and petrified wood common; generally light yellowish brown to very pale brown to light bluish gray to greenish gray sandstone, with some dark red to reddish brown to grayish black siltstone.- Ada Lovelace (Wikipedia)
Augusta Ada King, Countess of Lovelace (née Byron; 10 December 1815 – 27 November 1852) was an English mathematician and writer, chiefly known for her work on Charles Babbage’s proposed mechanical general-purpose computer, the Analytical Engine. She was the first to recognise that the machine had applications beyond pure calculation.