Occotoks

  I know that I've seen numerous posts at Rock Piles about "shadows" such as the ones illustrated here:

http://rockpiles.blogspot.com/2014/03/marker-piles-final-interpretationopinion.html

    In a video from the National Park Service linked to below, Doug Harris says (describing the stone circle above): "This is a shadow casting stone in an array of stones. Occotoks, as it is called in the Mohegan language. We have not done the ground truthing yet to confirm whether or not the shadow casting is by sunlight or by moonlight, but we have identified that that’s what it is..."
  Source:
 https://www.ncptt.nps.gov/blog/ceremonial-stone-landscapes/

https://youtu.be/oZIwbvYddQs

    Additionally, here's another training video I just recently came across from the same Federal organization that recognizes and is meant to protect these National Treasures, Ceremonial Stone Landscapes:

https://www.ncptt.nps.gov/blog/ceremonial-stone-landscapes-of-new-england-and-developing-best-practices-to-assess-submerged-paleocultural-landscapes/

https://youtu.be/35hswwxcIFI

 (Images lifted from the YouTube videos - and possibly from some of the contributors at this blog)