Barton,
we haven't quite reached post 221 yet but I am assuming you meant 211, as far as what is in the circle think of it as a side dissection of what is in the ground with a thin cap rock on the top, its just like looking at a shaft sign, your looking at the side view of a hole going down in the ground.
Dtth
In Order for the Turtle to be going to a treasure it must have a body as the shell is used for the information or as the alignment, this is why the Sentinels and the Spanish will leave a turtle with the Head and Body separated by a gap or separation from each other, because supposedly it means the treasure has been removed. So the Body must be with the Head for the turtle to be going to treasure. This Excludes the storage turtle heads I have talked about before which don't really give a direction only the markers around it do.
A,
since very few people dig up treasures, the deathtraps are very rarely found, most deathtraps are used at the depots/pickup areas where there is alot of treasure stored, a general rule of thumb the bigger and more abundant the markers are above ground the more likely the chance of running into a deathtrap both above ground and below ground. If you look at Kenworthy's deathtrap (shown below) called the Grande deathtrap, I have seen 2 of them and one actually had a square doorway under it (just like the picture) at the back of it for you to dig which would let the huge boulder fall and crush you while digging under it. So I have seen both above and below ground deathtraps.Look at #58 in my guide for the below ground one. I would consider the Crocodile as an absolute deathtrap sign, The People in the Egyptian days in the Nile considered the Crocodile as absolute Death.
View attachment 1387929