Hiya Stonelifter,
>The portable carved stone is part of this row rather than the stone row being part of the Rock Art.
Aye, that's how it seems, though the age of the row seems to be open to interpretation.
>There are other carved stones nearby as well. Just one of these is recorded
If you're meaning the Blackstone, and the teardrop shaped dints, I reckon they're sub-threshold. But the indisputable presence of an acknowledged portable CnR would make me think that there must have been cairns in the area, back in The Prehistoric. Either that or some ancient wanderer got sick of lugging his/her portable all the way from Sewingshields to Cross Fell, and dumped it on his/her way to the gold ear-ring shop at Kirkhaugh.