Fossil Trilobite Fossil Arthopod 1 inch Elrathia Kingii Era Millard Co Utah

Description

Fossil Trilobite Fossil Arthopod 1 inch Elrathia Kingii Era Millard Co Utah
Tagged from original purchase 1980
Rock 3" x 1 3/4"
Arthopod 1"
Tag reads:
Elrathia Kingii
Wheeler Fm.
Cambrian
Millard Co., Utah
https://geology.utah.gov/map-pub/survey-notes/glad-you-asked/trilobites-and-cambrian-utah/Where are trilobites found in Utah?
Trilobites?
Trilobites are members of the phylum Arthropoda (jointed-foot animals). Arthropods have segmented bodies and appendages covered by an exoskeleton which provides support and protection for muscles and organs. Living Arthropods include insects, spiders, scorpions, ticks, crabs, lobsters, barnacles, and centipedes.
Trilobites belong to an extinct class of marine organisms called Trilobita. This name refers to the three-part (tri-lobes) latitudinal and longitudinal shape of a trilobite’s exoskeleton. The latitudinal lobes consist of the cephalon (head), segmented thorax (body), and pygidium (tail); the longitudinal lobes consist of two lateral lobes (on each side of the body) and an axial lobe (central back area of the exoskeleton).
Trilobites are probably the most common fossils collected in Utah, many world-class specimens from this state reside in museums throughout the world. In Utah, trilobites can be found at several localities.
House Range
The Wheeler Amphitheater in the House Range, Millard County is one of the more well-known collecting areas. Most of the trilobites in this area come form the Middle Cambrian formation called the Wheeler Shale. The Wheeler Shale contains interbeds of shaley limestone, mudstone, and thin platy limestone. Another trilobite-bearing unit that directly overlies the Wheeler Shale in the central part of the House Range is the Marjum Formation. This formation consists of thin-bedded, fine-grained, silty limestone with interbeds of shale and mudstone.
Also located in the central part of the House Range is a fossiliferous limestone called the Weeks Formation, that crops out in North Canyon near Notch Peak. The Weeks Formation overlies (is younger than) the Marjum Formation and also contains trilobites.
Wellsville Mountains
Another trilobite-bearing unit is the Spence Shale Member of the Langston Formation in the Wellsville Mountains, Box Elder County. Here, trilobites can be found in Miner’s Hollow, Cataract Canyon, Dry Canyon, and the area between Antimony and Hanson Canyons.