What it could be is it sounds to me like if there was siderite in that so if there's iron carbonate.

在我看来，这可能是因为里面有菱铁矿，所以如果有碳酸铁。

If the iron carbonate has a little bit of sulfur in it then the sulfur tends to precipitate out as a kind of yellow powder.

如果碳酸铁中含有少量硫，那么硫往往会以黄色粉末的形式沉淀出来。

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。