silicified fossil造句

A study of the taphonomy of silicified fossils ( especially brachiopods ) in Devon concluded beekite resulted from the aerobic decomposition of organic matter in an environment with a limited supply of silica during early diagenesis.
"Turritella agate " is formed from silicified fossil " Elimia tenera " ( erroneously considered " Turritella " ) shells . " E . tenera " are spiral freshwater gastropods having elongated, spiral shells composed of many whorls.
It's difficult to find silicified fossil in a sentence. 用silicified fossil造句挺难的