Note 590 — Chapter XIII

The northern zone, circumscribing the great lakes, is characterised by monuments of rude form; the southern zone, between the Gulf of Mexico and the basin of the Ohio, is distinguished by mounds in the form of a truncated pyramid; while the middle zone, that of the basin of the Ohio, presents a large number of mounds of peculiar and very perfected types. In each of these zones special regions may be distinguished, characterised by the shape of the mounds and by the nature of the objects immured in them.