Pembrokeshire forum 7 room
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32 - burial chambers
18 - standing stones
6 - standing stones plural
1 - cup-marked, (possibly two)
40ish - round barrows/multi barrows/cairns
122 - camps/ancient sites
29 - crosses/inscribed, plus extras in the churchyards
1 - roman remains

all above approximate, but its interesting that there are not as many s/s as I thought, how many other cupmarked stones are there in Wales? taken from Dillwyn Miles - Pembs Coast

"how many other cupmarked stones are there in Wales?"

Darvill & Wainwright recorded "a provisonal corpus of 33 rock-sites comprising more than 37 panels" in the 2003 Proceedings of the Prehistoric Society.

Being from Pembrokeshire myself I know that not all standing stones are indicated on OS maps, I am unsure of wether that means they are scheduled or not. I suspect not. For instance there is a standing stone here: SM866181 that is not marked anywehere.