stone with superficially etched intersecting striations

[nunyabiz111]

(not pictured, though it was practically 'blank' on the flip side)

a bit atypical as far as lines on a cobble go around here, and surely not created from such great forces responsible for the "shocked" rocks found in all shapes and colors along the stream:












I have one stored somewhere with similarly shallow "lattice" lines along one of its six faces, being rectangular in shape which i'll post when I find it

 

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[metrotec]

Glacier grinds

 

[The Grim Reaper]

Natural weathering and fracturing.

 

[Charl]

I agree that the first rock, photographed next to the lighter, does not appear to be the same natural phenomenon as seen in the other rocks shown. That first rock does resemble what is seen in some deliberately incised rocks. This one was found by a TNet member in a dry stream bed in California. It may be steatite, not quite sure. But such incised rocks are common at some sites in southern Cal.

Well, I’m not sure, I’m not holding it in hand, don’t know what rock type it is, but I would have picked it up as a possible incised pebble/cobble. I don’t think it’s the same as those other, far more obvious, natural rocks. It’s not as busy as the incised rock I’m showing, but it reminded me. And incised crosshatch patterns are common in portable petroglyphs....





Crosshatch pattern, portable petroglyph, Norton, Ma.....

 

[Tdog]

The first one looks deliberate. The rest by mother nature.

 

[nunyabiz111]

Haven't gotten around to finding that second etched rock I mentioned, though did happen upon an earlier pic of it showing the detailed facet (one other having some crosswise perpendicular lines, the rest blank):

 

[nunyabiz111]

couldn't help but notice in the corner of my eye while going in to check something else earlier this week...as with the one in the original post, the etchings are conspicuously present on only one facet; ~½ mile downstream from said specimen:












and for good measure..another cool-looking "shocker" that must have gotten desilted by the ice flows recently:

 

[uniface]

I agree that the first rock, photographed next to the lighter, does not appear to be the same natural phenomenon as seen in the other rocks shown. That first rock does resemble what is seen in some deliberately incised rocks. This one was found by a TNet member in a dry stream bed in California. It may be steatite, not quite sure. But such incised rocks are common at some sites in southern Cal.

Well, I’m not sure, I’m not holding it in hand, don’t know what rock type it is, but I would have picked it up as a possible incised pebble/cobble. I don’t think it’s the same as those other, far more obvious, natural rocks. It’s not as busy as the incised rock I’m showing, but it reminded me. And incised crosshatch patterns are common in portable petroglyphs....

View attachment 1901031

View attachment 1901032

Crosshatch pattern, portable petroglyph, Norton, Ma.....

View attachment 1901033

Agree completely.

 

[dirstscratcher]

This is from a 15'th century village site near Clyde Ohio. It's engraved all around, both sides and edges. I can't find the photo of the opposite side right now, but it's just cross hatched. This side appears to have something depicted. We were excavating the site, and actually found it on the surface outside the excavation area. This is the same site I posted the corn cob photos from. I JOKINGLY referred to this as the dead crow effigy (or petroglyph) stone used to ward off raiding crows from their corn crop. The cross hatch it's lying on is 1cm squares.