| A pyritized tubular body fossil from the late Precambrian (Ediacaran Period) Esmeralda Member of the upper Precambrian-lower Cambrian Deep Spring Formation, Esmeralda County, Nevada. Two views of the same Conotubus specimen, a small shelly tubular fossil, preserved by the mineral pyrite (iron sulfide)--a fossil known only from two localities in the world: southern China and Esmeralda County, Nevada. Photograph courtesy a specific scientific publication. |