Marjum Formation
The Marjum Formation is a Cambrian geological formation that overlies the Wheeler Shale in the House Range, Utah. It is named after its type locality, Marjum Pass, and was defined in 1908. The formation is known for its occasional preservation of soft-bodied tissue, and is slightly younger than the Burgess Shale, falling in the Ptychagnostus praecurrens trilobite zone.
| 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 |
| Lithology | |
| Primary | limestone |
| Other | shale, metasedimentary rocks |
| Location | |
| Region | Utah |
| Country | USA |
| Extent | House Range |
| Type section | |
| Named for | Marjum Pass |
| Named by | Charles D. Walcott |
| Year defined | 1908 |
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