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The `Cyborg Astrobiologist' (CA) has undergone a second geological fieldtrial, at a red sandstone site in northern Guadalajara, Spain, near Riba deSantiuste. The Cyborg Astrobiologist is a wearable computer and video camerasystem that has demonstrated a capability to find uncommon interest points ingeological imagery in real-time in the field. The first (of three) geologicalstructures that we studied was an outcrop of nearly homogeneous sandstone,which exhibits oxidized-iron impurities in red and and an absence of these ironimpurities in white. The white areas in these ``red beds'' have turned whitebecause the iron has been removed by chemical reduction, perhaps by abiological agent. The computer vision system found in one instance several(iron-free) white spots to be uncommon and therefore interesting, as well asseveral small and dark nodules. The second geological structure containedwhite, textured mineral deposits on the surface of the sandstone, which werefound by the CA to be interesting. The third geological structure was a 50 cmthick paleosol layer, with fossilized root structures of some plants, whichwere found by the CA to be interesting. A quasi-blind comparison of the CyborgAstrobiologist's interest points for these images with the interest pointsdetermined afterwards by a human geologist shows that the Cyborg Astrobiologistconcurred with the human geologist 68% of the time (true positive rate), with a32% false positive rate and a 32% false negative rate.  (abstract has been abridged).Comment: to appear in Int'l J. Astrobiology, vol.4, iss.2 (June 2005); 19  pages, 7 fig

The Cyborg Astrobiologist: scouting red beds for uncommon features with geological significance