The Big Freeze! (Petrification via Freezing)
Freezing is a form of preservation that occurs when an organism and all it's remains are unchanged throughout time. The most well know frozen fossils that have been found would be of the Wooly Mammoth. These fossils are found in Siberia; with hair, soft tissue, organs, and even undigested vegetation in the stomach. Even though frozen fossils are very hard to find; the mode of preservation is quite remarkable.
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("Dima, a preserved baby Woolly Mammoth") Mammoth clone: Science or simply fiction?. Web. 28 Jan 2011.