Sedimentary rocks take many forms, sand stones, mud stones, shales, iron stones, you name it.

沉积岩有多种形式，砂岩、泥岩、页岩、铁矿石，应有尽有。

It seems that iron is the paleontologist's friend so any kind of iron cementation, iron stone cementation, so siderite, iron carbonate helps to preserve structures within sediment.

铁似乎是古生物学家的朋友，所以任何一种铁胶结，铁石胶结，所以菱铁矿，碳酸铁有助于保护沉积物中的结构。