The jambs were of dressed stone, usually plain, and the longer lintels were of zapote wood; some of them, where protected from the weather, are still to be seen, sometimes covered with inscriptions.
The materials on the coast were clay and gravel wrought into concrete, sun-dried bricks and pise, or rammed work, cut stalks of plants formed with clay a kind of staff, and lintels were made by burying stems of cana brava (Gynerium saccharoides) in blocks of pise.
The clay dug from the moat served to make the bricks of the wall, which had loo gates, all of bronze, with bronze lintels and posts.
It is curious to find the representation of various animals in relief on the lintels of these buildings.
Some of the gates without lintels are beautiful, and the geometric patterns in the walls extremely effective.
The climate is much drier than that of Chiapas, and the structures are in a better state of preservation than those of Palenque, but the rank vegetation and the decay of the wooden lintels over the doorways have broken down many of the walls.