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The Marjum Formation is a Cambrian geological formation that overlies the Wheeler Shale in the House Range, Utah.[1] It is known for its occasional preservation of soft-bodied tissue, and is slightly younger than the Burgess Shale,[2] falling in the Ptychagnostus praecurrens trilobite zone.[3]

Marjum Formation
Stratigraphic range: Middle Cambrian


  1. ^ "Trilobites of The Marjum Formation".
  2. ^ Robison, R. A. (1964). "Upper Middle Cambrian Stratigraphy of Western Utah". Geological Society of America Bulletin. 75 (10): 995–1010. Bibcode:1964GSAB...75..995R. doi:10.1130/0016-7606(1964)75[995:UMCSOW]2.0.CO;2. ISSN 0016-7606.
  3. ^ Conway Morris, S.; Robison, R. A. (1986). "Middle Cambrian priapulids and other soft-bodied fossils from Utah and Spain" (PDF). University of Kansas Paleontological Contributions. 117: 1–22. hdl:1808/3696.