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] Moon, Caron & Moysiuk (2023) considered these fossils would be ctenophores instead.

[24]