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
What Really Happened to the Class of '65? 1978. The only regular was Tony Bill in the role of Sam Ashley. Others who appeared were Leslie Nielsen, Jane Curtin, Larry Hagman, Linda Purl, Meredith Baxter, and Emmaline Henry. The TV show was filmed at Grant High School in Van Nuys, California. What Really Happened to the Class of '65? What Really Happened to the Class of '65? is a 1976 non-fiction book by Michael Medved and David Wallechinsky. Inspired by a 1965 "Time" magazine article, the authors follow up on the people of Palisades High School mentioned in the article, and the book mainly consists of that follow-up.