化學成分：磷酸鈣
年代：中生代
說明：
糞便與化石，這兩個詞，分別是一瞬間與永恆，是不是聽起來就存在一種衝突感呢？
Dung and fossil, eternity and transience: the conflict between the two is obvious.
從數十億年前的古生代至今，曾經存在著恆河沙數的生命，然而糞便化石的發現數目卻不如預期中來的多，因為糞便在第一現場的保存就十分不易，除了少數在落地後短時間內即被迅速掩埋外，大部分的糞便容易遭受天氣狀態、生物活動……等諸多原因而不復存在。糞便化石代表著遠古時代的環境訊息賦予我們很大的教育意義，因此我們稱這些糞便化石為「黃金」也真是不為過！
From the Paleozoic billions of years ago to the present day, countless animals have lived and died, yet dung fossils are still quite rare. Dung is quite hard to preserve at the scene, because
except for those which were quickly buried, most fecal matter is easily broken down by weather or animals.
侏羅紀小學堂：
「糞便化石為生痕化石的一種，生痕化石泛指生物活動所留下的痕跡，也是古生物學家還原古生物習性過程中十分重要的一環，由糞便的構成，我們可以推斷生物的食性，甚至是當時的生存環境呢。」
Did you know: Coprolite is a type of ichnofossil(from Greek: ἴχνος ikhnos “trace, track”). They help paleontologists determine the characteristics of ancient organisms. Through dung fossils, we can discover what they ate, and even where they lived.