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So
that archaeologists can map and accurately record where things were found,
the first step is to set up a grid across the site. Grid stakes are placed
at regular intervals and each is labeled with a coordinate, a measurement
telling how far away the point is from the grid's beginning. N50/E100, for
example, means that the point 50 meters north of the grid's origin and 100
meters east of the origin.
When archaeologists dig, they excavate one layer at a time. Just as natural soils or rocks are layered in the earth, archaeological sites are made up of layers or strata. Each layer represents a different time period, so by digging stratigraphically , one layer at a time, archaeologists can sort out the history of a site.
In most layers, archaeologists will find artifacts, things that were made and then lost or discarded by people. The layer and location in which an artifact was found is recorded, and artifacts from each layer are kept together, as they are from different time periods. Because some artifacts are extremely small, such as pins, beads, or seeds, all of the excavated dirt is screened through wire mesh. Screening ensures that no small objects are missed.
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