| Marjum Formation | |
|---|---|
| Stratigraphic range: Middle Cambrian | |
 Notch Peak Sill intruding into the layers of white marble and grey argillite of the Marjum Formation | |
| Type | Geological formation |
| Overlies | Wheeler Shale |
| Thickness | Up to 430 meters[1] |
| Lithology | |
| Primary | limestone |
| Other | shale, metasedimentary rocks |
| Location | |
| Region |  Utah |
| Country |  USA |
| Extent | House Range |
| Type section | |
| Named for | Marjum Pass[2] |
| Named by | Charles D. Walcott |
| Year defined | 1908[2] |
The Marjum Formation is a Cambrian geological formation that overlies the Wheeler Shale in the House Range, Utah.[1][3] It is named after its type locality, Marjum Pass, and was defined in 1908.[2] The formation is known for its occasional preservation of soft-bodied tissue, and is slightly younger than the Burgess Shale,[4] falling in the Ptychagnostus praecurrens trilobite zone.[5]
- ^ a b Foster, John; Gaines, Robert (October 2016). "Taphonomy and paleoecology of the "middle" Cambrian (Series 3) formations in Utah's West Desert: Recent finds and new data". Utah Geological Association Publication. 45: 291–336.
- ^ a b c Walcott, Charles D. (1910). "Nomenclature of some cambrian cordilleran formations". Smithsonian Miscellaneous Collections. 53 (1): 1–12. hdl:10088/23377.
- ^ "Trilobites of The Marjum Formation".
- ^ 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.
- ^ Conway Morris, S.; Robison, R. A. (1986). "Middle Cambrian priapulids and other soft-bodied fossils from Utah and Spain". University of Kansas Paleontological Contributions. 117: 1–22. hdl:1808/3696.