These structures are classified as traditional/precolonial (depending on the date) and colonial. Precolonial settlements comprise circular arrangements of stone representing the footings of wooden dwellings; the circles vary in diameter and number and there may also be a central livestock enclosure which is recognisable archaeologically as a roughly circular area (ca 30m  diameter) of darkened soil. There are often various non-identifiable structures. Colonial sites typically have fewer structures - angular corners are a good indicator as is the presence of obviously European debris such as glass, wire etc. The very early European sites often have traditional structures close by.