Ca.Olenellus clarki # 5


1 in stock

SKU: tri/ollen5-app 50 Categories: ,


Age – Early Cambrian ( 540 million years )
Location – Marble Mountains,Ca.
Size – 1″ ( there are 2 partials on this plate )
Size- 6″ x 2 1/2″ ( matrix )

The term Trilobite refers to an extinct class of arthropods. Tri-lobe0ite alludes to the three-part, longitudinal division of their exoskeleton. These animals first appeared at the beginning of the Cambrian Period around 570 million years ago. They flourished throughout the early Paleozoic Era and then decreased in diversity until their extinction in the late Permian Period around 240 million years ago. These marine invertebrates were primarily bottom dwellers. Fossilized remains of trilobites have been found on every continent and admired by humankind, considered objects of value for thousands of years. In the town of Dudley, England, the “Dudley Locust”, an Ordovician trilobite of the genus Calymene, has been collected and sold in shops since the 17th century. Today Trilobites are prized by collectors and museums throughout the world as objects of beauty and curiosity. Scientists use Trilobites as stratigraphic index fossils which help to determine the age of rock formations. The true value of trilobites, however, lies in the fascinating story which these fossils tell about the history of ancient life on Earth.

A little history lesson.
In the Cambrian, the continent of Laurentia (now the majority of North America), was near equatorial, and oriented about ninety degrees from its current position. Close to the shorelines of Laurentia, limestone was deposited as shallow-water reefs. Beyond the limestone belt, fine sediments built in deeper offshore contours, sometimes rapidly via undersea landslides off the reef platform. These offshore deposits along the paleoequator include much of the Wheeler Shale, the Burgess Shale of western Canada, and other sites from California through Utah to the Northwest territories of Canada. All of these sites yield remarkably preserved Cambrian fossils.

The Marble Mountains is one of the best-known and most productive Cambrian trilobite localities in the state of California. This is a rather small mountain range in one of the harshest, driest parts of the Mojave Desert, in southeastern California near the towns of Chambless and Cadiz. Its trilobite-bearing rocks include exposures of the Latham Shale.

The Latham Shale is of late Early Cambrian age and occurs in outcrops scattered widely throughout San Bernardino and Inyo Counties, California. At least 12 trilobite species (mostly olenellids) have been documented there.

Additional information

Weight 1 lbs
Dimensions 2 × 2 × 2 in