Full text of the European inscription top right above older petroglyphs: We passed by here, the Captain-Sergeant-Major Juan de Arechleta and the Adjutant Diego Martin Barba and the Lieutenant Agustin de Ynojos, year of 1636
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There are a notable number of names and initials inscribed in the vicinity of the High Tanks - but apparently almost none of them have been connected to other historic documents - I wouldn't know the subtle differences between 'fake' and 'real' but my best guess is the date on this insciption is 1834 and the style seemed to me different than the other inscriptions I saw.
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