Coal the heat and pressure of deep burial causes the loss of water, methane and carbon dioxide and an increase in the proportion of carbon. Thus first lignite (also called "brown coal"), then sub-bituminous coal, bituminous coal, and lastly anthracite (also called "hard coal" or "black coal") may be formed. The wide, shallow seas of the Carboniferous Period provided ideal conditions for coal formation, although coal is known from most geological periods. The exception is the coal gap in the Permian–Triassic extinction event, where coal is rare. Coal is known from Precambrian strata, which predate land plants—this coal is presumed to
Fools Gold/What the World Is Waiting For double A-side. "Fools Gold" has been described as a Madchester and dance-rock song. The dance-oriented song showcased the rhythm section of Mani on bass and Reni on percussion. Ian Brown stated the song was written over "The Funky Drummer" by James Brown, which Reni had to learn the beat from. John Squire also plays guitar with various wah-wah pedal effects. Ian Brown sings the vocals in a whispered delivery. He would also perform with this technique for the track "Something's Burning". The bassline was inspired by "Know How" by Young MC, which is a sample from the "Shaft" theme song,