No satisfactory general classification of the ruins of the ancient
pueblo region has yet been made; possibly because the material in hand
is not sufficiently abundant. There are thousands of ruins scattered
over the southwest, of many different types which merge more or less
into each other. In 1884 Mr A. F. Bandelier, whose knowledge of the
archeology of the southwest is very extensive, formulated a
classification, and in 1892, in his final report,[11] he announces that
he has nothing to change in it. The classification is as follows: