Directly north of the east shore site in the previous post is a square enclosure with two openings. The center wall is about 25 feet long, and the enclosure is about 75 feet across and 35 feet deep. The water is very shallow, and this structure would have been completely out of the water before the pond was raised. Although the square shape suggests a barn or boat house foundation, the walls of this enclosure have features suggesting it was built by Indians. Here is a view from the water, showing the walls of the enclosure and its tall reeds, with the large turtle-shaped boulder from the previous post to the right.
Here's a satellite view from Bing Maps.
So what could be the purpose of the small enclosure? Since it faces west over water, it may have been a burial ground.
Here is a view looking into enclosure through the south opening, done in ink brush. The turtle head is to the extreme right, the propped rock to the left, and the semicircles invite the viewer to visit the cairns inside.