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
Society for Scientific Exploration X-Files or in the National Enquirer shows up first here. But what also shows up is a surprising attitude of skepticism." The society's magazine, the "Journal of Scientific Exploration", was established to provide a scientific forum for ufology, parapsychology and cryptozoology, having published research articles, essays, book reviews and letters on those and many other topics that are largely ignored in mainstream journals. The journal is currently edited by parapsychologist and philosopher Stephen E. Braude. The Spirituality and Psychiatry Special Interest Group of the Royal College of Psychiatrists says that the journal has reports about anomalies in science, particularly in