Millard County

House Range trilobites

Last checked October 2026. No pins.

Layered cliffs of the northern House Range glowing at sunset above flat Tule Valley — The northern House Range at sunset, over Tule Valley. The Cambrian shale beds sit in these ranges. Photo: Qfl247, CC BY-SA 3.0, via Wikimedia Commons

The House Range west of Delta has a paid trilobite quarry and public shale people treat as BLM. The fee pit is their ground and their ticket. The public shale, if the owner layer says BLM, starts from casual use for common invertebrate fossils.

Vertebrate fossils are not part of that allowance. A trilobite is not a dinosaur bone, and a bone is not a trilobite. Confirm the section, because SITLA sits in this checkerboard. Paid dig vs public land.

What you might find here

A dark Elrathia kingii trilobite fossil in gray Wheeler Shale from Antelope Springs, Utah — Elrathia kingii from the Wheeler Shale at Antelope Springs, House Range. This is the common bug. Photo: Tortie tude, CC0, via Wikimedia Commons

A black Elrathia kingii trilobite fossil on tan Wheeler Shale with a yellow scale bar — Elrathia kingii in Wheeler Shale, with a 5 mm scale bar. Photo: Wilson44691, public domain, via Wikimedia Commons

A black Elrathia kingii trilobite with a notch in its side from a healed bite — Elrathia kingii (3 cm) with a healed bite mark, Wheeler Formation, House Range. Photo: James St. John, CC BY 2.0, via Wikimedia Commons

A tiny two-lobed agnostid trilobite, Ptychagnostus gibbus, in gray shale — Ptychagnostus gibbus, a 5 mm agnostid trilobite from the Wheeler shale, House Range. Look for these tiny ones too. Photo: Dwergenpaartje, CC BY-SA 3.0, via Wikimedia Commons

Informational only — not legal advice. Confirm with the managing agency before you dig or hunt.

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