Here is a trilobite concretion with a large and beautiful Asaphiscus wheeleri from the Wheeler Shale of Utah. The trilobite nodule comes with a positive and a negative side. | |||
Location: | Millard Co., Utah, USA | ||
Size trilobite: | about 53 mm long | ||
Age: | Middle Cambriun, Wheeler Fm. (about 518 Mill. Y.) |