Coal takes many millions of years to form. This is proof of the very old age of the earth.
The Facts Are .....
Peat of a quality similar to certain coal beds of the Eastern USA has been formed over a period of 3 years at the bottom of Spirit Lake. When Mount St. Helens erupted, a huge layer of pine debris was deposited in the lake and turned into coal at considerable depths. This formation contradicts the evolutionary model which says that peat forms in swamps (not lakes) in a slow process taking about 400 years to produce each centimetre of coal. 
Professor Martini (Guelph University, Ontario, Canada), a world authority on peat formation asked himself the following question during his keynote address at the Australian National Coal Conference at Newcastle University (NSW) - "What is the relationship of peat to coal?" His reply - "I don't know". Educators teach that coal comes from peat, obviously in contradiction to known facts.
Coal has been formed in the laboratory from the heating of lignin in periods ranging from 2 weeks to one year. The lignin was heated with clay to a temperature of 150ºC, the clay apparently acting as a catalyst. Coal clearly does not need millions of years to form. 
Examination of radiohalos in coal deposits from the Colorado Plateau by chemistry researcher Robert Gentry (Oak Ridge National Laboratory) indicate that the coal was formed in less than 25-50
years. This is considerably less time than the millions of years demanded by evolution. 
"Such extraordinary values [discovered from radiohalos] admit the possibility that both the initial Uranium infiltration and coalification could possibly have occurred within the past several thousand years." Written by Robert V. Gentry, et al, in their article "Radiohalos in Coalified Wood: New Evidence Relating to the Time of Uranium Introduction and Coalification" 
International authority on solar energy, Mary Archer, has calculated that the energy content of the world's known supply of fossil fuels is equivalent to the solar energy falling on the earth's surface in 14
days. Only about 0.03% of the solar energy reaching the earth's surface is stored as chemical energy in vegetation as a result of photosynthesis. Therefore it would take 128 years of solar input via photosynthesis to produce the energy in today's known coal reserves. 
- Confident Living, Vol. 45, No. 10, 1987 p:41
- Creation Ex Nihilo, Vol. 7, No. 3, 1985 p:25
- Science News, Vol. 124, August 6, 1983
- Science, Vol. 194, 1976 p:315-317
- Science, Vol. 194, 1976 p:316-317
- Journal of Applied Electrochemistry, Vol. 5, 1975 p:17