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
Night of the Big Heat (film) which also creates enough heat to ignite the car's petrol tank. Meanwhile, another pub regular, losing his mind because of the heat, attempts to attack Angela whilst she's working, but when she brains him with an ashtray he flees and ends up burned to death as well. Jeff finally corners Hanson and demands answers from him. According to the scientist, Fara Island is the site of an invasion by extraterrestrials, whose extremely high temperature burns any living creature that gets too close to them. Jeff and Hanson resolve to stop the aliens with the help of local physician Dr. Vernon