Thanks to all for your input in this discussion and for all the images, they are very helpful.
I also thought this really strange when I read the article, but the more I study the images, the more I find it to resemble the sinkholes I've seen in Lot (French region) and also in Abel Tasman national park New Zealand – both limestone country, as I understand this part of Guatemala is.
Limestone easily erodes, and the lower part of the regolith becomes sandy and instable, and crumbles down into lower areas of the ground, and suddenly, one day, the top 2meter or so have nothing left underneath and the sinkhole opens up. It makes sense that this happens when there is more rain than usual (top layer gets heavier) or an earthquake.
You can also see the phenomenon in smaller scale if you look at a plain that has been marshy or very waterlogged in the past, and then drained by (stupid) humans to create pasture or fields for crops. In different places, this creates landslides (on slopes) or small sinkholes (on flat areas), just because the hydrological pressure that kept the level of the ground up has now dissapeared (it has been drained away).
The traces and forms of natural processes often resemble scales, circles, clawmarks etc, I see that as signs of everything's oneness. It IS eerie though, when a BIG, very circular, very deep hole suddenly opens up! And other natural phenomena (nuctilucent clouds, auroras, big waves, hurricanes, volcanos...) are too, without always having any unknown factors involved.
For what it's worth – I enjoy reading all your more imaginative hypothesis on this as well!! You never know!