How should a silicified fossil be exposed from a limestone deposit?
A) Application of an alkaline
B) Application of acid
C) Soaking in a saline solution
D) Longitudinal cut in a controlled environment
E) Such fossils are best observed by leaving them contained within the material in which they were preserved and then examining them via non-invasive means such as MRI or archaeomagnetism.

Question

Quizplus · Accepted Answer

Silicified fossils in limestone can be exposed by applying acid, such as dilute hydrochloric acid. The acid reacts with the limestone (calcium carbonate) to dissolve it, leaving the silicified (silica-based) fossil intact because silica does not react with the acid under normal conditions.

How Should a Silicified Fossil Be Exposed from a Limestone