3.3: Archaeological layers
In talking about archaeological context we tend to think of it in terms of being composed of individual layers. These are discrete units of sediment, debris, rock, and other materials that form or accumulate as the result of natural processes, human activity, or both. In order to describe them and indicate their position on a site and in its sequence, these layers are generally numbered sequentially (with the lowest number being that removed first). An individual layer or deposit may be termed (following geological nomenclature) a stratum, and multiple layers are called strata. Therefore the study of their sequence is called stratigraphy (description of what we call the stratification). One of the simplest ways to depict layers is to depict them as a vertical sequence and this is frequently done in the form of a section (or 'profile') through them. Here is an explanation from Michigan State University 'Campus Archaeology' page "Archaeology 101: Reading strati
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