沙漠化石 is a type of block found in the 地下沙漠 biome in medium to large groupings. Mining it requires either a 梦魇 or 死亡使者镐 or higher, but unlike most similar materials, it cannot be removed with explosions.
Desert Fossils can be used with an 提炼机 to produce 坚固头盔s. They can also produce normal Extractinator drops. Desert Fossils produce more 琥珀 than 泥沙 or 雪泥 do. There is a 1/1666 (.06%) chance that an 蚊子琥珀 (Baby Dinosaur pet) will be produced (the odds are 1/5000 (.02%) for Silt and Slush).