Markers

Several types of markers have been identified. 

Here is a good example of a 'twist'.

And here is a small example of the typical 'teepee' type marker.

Here is a larger 'teepee' type

Here is a more complex 'teepee' shape

And a large marker that has characteristics of both the 'teepee' and the arch

And some markers are laying flat on the ground

Some quite complex in areas where they could NOT have fallen

And some quite simple, but far from any tree they could have fallen from.