Voltaire - Sol 554

Original NASA caption:"This false-color mosaic was taken with Spirit's PanCam on Martian Day 554 (July 25, 2005), while Spirit was sitting on the Voltaire layered rock outcrop.
A rock within the Voltaire outcrop, called Haussmann, exhibited many interesting patterns, including rounded pebbles that are approximately 2 to 3 cm (0,8 to 1,2") across.
The pebbles are embedded in a finer-grained matrix of material.
The striations in Haussmann are noted. The rounded pebbles must have been exposed to erosion in the past, before they were embedded into the rock.
The layered rocks in this area are thought to have formed from an impact event, as ejected deposits. They illustrate the complexity of the rocks found by Spirit as the Rover made its way to the Summit of Husband Hill".

Nota: la ragione che ha suggerito ai Tecnici del Controllo Missione, quale nick-name per l'outcrop e le rocce in esame, il nome del grande Filosofo e Scrittore Francese, è - forse - fra i Misteri di Marte, il più grande...