Since nobody has come up with an answer, I have added another visual clue. This artefact below comes from the site above.
As WOGE 88 is dragging on on a bit, I added yet another visual clue; below is a wider view of the area.
Q: What is When on Google Earth? A: It’s a game for archaeologists, or anybody else willing to have a go!
Q: How do you play it? A: Simple, you try to identify the site in the picture.
Q: Who wins? A: The first person to correctly identify the site, including its major period of occupation, wins the game.
Q: What does the winner get? A: The winner gets bragging rights and the chance to host the next When on Google Earth on his/her own blog!
Be the first to correctly identify the site above and its major period of occupation in the comments below and you can host your own!