This Petroglyph was probably made by a missionary working in this area. It is on a serene part of the river which could well have been his chosen place for worship.
If you take the geometric parts and translate each one; a circle - represents a place, a square - represents four walls or a home, a triangle - represents the trinity or the eye of God and a cross is a symbol of worship. Put them all together and it becomes "This is Gods home, worship it".
As with all Petroglyphs, use only flour to highlight them for photographing.
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