Nanobe

They were found growing from rock samples (both full-diameter and sidewall cores) of Jurassic and Triassic sandstones, originally retrieved from an unspecified number of oil exploration wells off Australia's west coast.

While Uwins et al.[3] present assertions against it, they do not exclude the possibility that the nanobes are from a surface contaminant, not from the rock units cited.

A 2022 study concluded that ALH84001 did not contain Martian life; the discovered organic molecules were found to be associated with abiotic processes (ie, "serpentinization and carbonation reactions that occurred during the aqueous alteration of basalt rock by hydrothermal fluids") produced on the very early Mars four billion years ago instead.

[6][7] Nanobes are similar in size to nanobacteria, which are also structures that had been proposed to be extremely small living organisms.

However, these two should not be confused: Nanobacteria were thought to be cellular organisms, while nanobes are hypothesized (by some) to be a previously unknown form of life or protocells.