What a confusion of ditches and banks! Not really helped by the fact that the British Israelites dug it up in the early 20th century looking for the Ark of the Covenant!
This should tell you all you need to know about that particular crowd: themodernantiquarian.com/post/3418
According to a guide at Tara, one of them still turns up yearly with a shovel and a map and asks to dig a test pit. Let’s hope this happens while a crowd of Modern Antiquarians are there, so we can help him to occupy it...