There most certainly is Roy, as classicly Bodmin moor shaped as you get, and i think the henges possible Neolithic date could be 750 years older than the stone circles near it, that's if the henge is say 3250 - 3000 BC and the circles around 2500 BC, if this is true the Triangle shaped stones in the circles around there may all be showing a link to the possibly older henge culture [and would be truly the circle builders ancesters] and maybe even to the possible older goddess/moon/bull culture. The triangle stones of the circle showing a possible hidden worship of her [and/or the moon], a lot of pointy stones certainly are willies, you're on to something with these triangle stones, the culture also shifted from moon/female and sun/male worship to more of just sun/male worship and i think these stones are the people keeping the goddess culture alive in their stone circles, it could even been a bit naughty to do it [it's the same age that the stonehenge alignment was changed from moon to sun as well], Barnett once suggested a similar thing [hiding a form of belief/worship] to do with the sun [there for all to see] and moon [hidden in the geometry] in the geometry of the Peak district stone circles.