On October 25, 1747 a ship named ‘Reijgersdaal’ sunk off the coast of South Africa. Then in 1979, less than 235 years later, the coin was found encased in solid fossilized rock.1
The discovery found coins dating back to the Song Dynasty of China which was from about 960 A.D. to 1279 A.D.. These coins had become fossilized in solid aragonite rock through a fossilization process, which like all the other fossilization processes is thought to take vast eons of time. Here the fossilization process is called lithification.1 Aragonite rock formations are found commonly within sedimentary layers laid down by water or within a body of water.
1 Untold Secrets of Planet Earth: Flood Fossils, Vance Nelson, Feb 2014 p.67