The mound that may be an effigy is attached. The spine of it runs from east to west within a couple of degrees. IN the first picture you can see where one piece of granite or gneiss is missing. It is in the picture at the bottom right where it fell off. The machete case in the pic is 16" long (with the machete in it the measurement is 20"). This does not look like a farmers' rock pile.
"Odd mound due south"
"Odd mound due east""Odd mound due west"
I just figured it out (the effigy). Draw out the rough shapes of the rocks you can see in the pic labeled odd pile due west.
The first rock is on the east side, looks like a head. The second going west is out stretched arms. The third breasts. The fourth a swollen stomach. The fifth fell out. The sixth (can be seen in odd mound due east) squatting/kneeling legs.