生物遗体被完全埋葬前在沉积物中留下的印迹，由于埋葬时遗体业已消失，岩层中并未留下除印痕外的其他痕迹。
所有这些羽毛类型在兽脚亚目的印痕化石中都被找到了，兽脚类属于恐龙亚目，包括了雷克斯霸王龙、鸟类以及其他手盗龙。
All these feather types have been found in fossil impressions of theropods, the dinosaur suborder that includes Tyrannosaurus rex as well as birds and other Maniraptorans.
我们所说的化石，指的是史前动物的遗迹，如已矿化的骨头，或留在石头上的骨头或器官的印痕。
By fossils, we mean traces of prehistoric animals such as bones, which become mineralized, or impressions of bones or organs that are left in stone.
尽管清晰的形状已为人所知，但大多数化石标本只不过是炭质印痕。
Most fossil specimens are little more than carbon impressions although distinctive shapes are known.
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