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Additional Information
Western Utah is the home of one of the best-known Cambrian fossil localities in the world. The slopes of Swasey Peak in the House Range, seen above, are composed of a rock layer known as the Wheeler Shale, with the overlying Marjum Formation forming the top of the peak. The Wheeler Shale and Marjum Formation, strata of Middle Cambrian age, are exposed throughout the House Range and nearby mountain ranges west of the town of Delta, Utah. The Wheeler Shale is named for a great bowl-shaped feature in the House Range known as the Wheeler Amphitheater, while the Marjum Formation is named for its outcrops at Marjum Pass, also in the House Range. Much of the Wheeler Shale is quite unfossiliferous, but certain layers contain abundant trilobites and other shelly fossils. The Wheeler Shale and Marjum Formation also contain a diverse biota of soft-bodied fossils, including many of the same taxa found in the more famous Burgess Shale.
Olenoides is a member of the order: Corynexochida,
References:
Wheeler Shale Formation
Marjum_Formation
Charles Doolittle Walcott
Olenoides
Vendor: fossil soup - ZZ
SKU Number: SQ5388284
Rhombampyx yii trilobite from the Middle Ordovician, Meitan Formation, Zunyi, Guizhou, China.
The distinct oval/rhomboid dome where the anterior needle spine meets the head is the highly inflated glabella. It is slightly compressed but shows the distinctive bulbous shape unique to raphiophorids.
You can clearly see a thin, straight line pointing straight up from the top of the glabella. This is the base of the median snout spine.
The two elongated cheek spines can be seen on either side of the body. In life, these spines flared outward to stabilize the animal or deter predators, but post-mortem movement or burial compaction has curved it around the cephalon.
Full dimensions are listed below.