CI1 fossils refer to alleged morphological evidence of microfossils found in five CI1 carbonaceous chondrite meteorite fall: Alais, Orgueil, Ivuna, Tonk and Revelstoke.
The research was published in March 2011 in the fringe Journal of Cosmology by Richard B. Hoover, an engineer.
However, NASA distanced itself from Hoover's claim and his lack of expert peer-reviews.
[1] Hoover's team used Environmental (ESEM) and Field Emission Scanning Electron Microscopy (FESEM) to analyze the meteorite samples, studying internal surfaces.
For comparison, Hoover compared the samples to those of terrestrial minerals and biological materials.