It is clear that the structural material is earth construction, but the type of construction is unknown. The structural material may be hidden, such as in the case of a plastered earth wall, or information about it is unavailable.
It is difficult to identify type of earthen construction when the walls are covered with plaster, like in this example of cob construction in India (People in Centre)
Older low-rise masonry buildings in Chile are of adobe construction (see the exposed portion of the wall); adobe is NOT considered to be an earthen construction (it is a masonry construction technology) (S. Brzev)
Many buildings in Peru are of adobe construction; adobe is NOT considered as earthen construction (it is a masonry construction technology) (S. Brzev)