Square markings in sandstone

Cochetopa

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Location
Galt's Gulch, Colorado
Detector(s) used
Minelab Eureka Gold
Primary Interest:
Prospecting
Hello,

I was out fossil hunting yesterday in western Colorado country that is all sedimentary rock, and a lot of it is 150 million year old sandstone. I was photographing some fossil "burrow" and "boring" markings left in the stone from long ago, when I saw a stone slab a photograph of which is attached to this posting. There are two or three "squares" seemingly chiseled into the slab. The right angles cause me to think they are not nature made. Does anyone have an idea if they have significance other than a curiosity?

FWIW, the location is about 1.5 miles west, up a shallow arroyo, from the "old Spanish trail", the route used by the Spanish traveling from Santa Fe to Los Angeles before the whites arrived.

Thank you for your ideas.

Regards,
-C
 

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