from Ohio State University - Archaeology Education
isthmia.osu.edu/arched/excavation.html
**Locating Sites **
**The visible remains of the ancient past do not normally lie exposed on hilltops or in the **
open desert. The Parthenon in Athens and the Egyptian pyramids are the exceptions and not the norm (Figure 8.1). **More commonly, archaeological sites are **
buried beneath the surface and may be partially or totally invisible to the eye. How then do archaeologists even locate sites given such a situation? In the olden days of classical archaeology, explorers used ancient literary references to place names as guides in locating lost cities. For example, Heinrich Schliemann relied on literary references from Homer, his own hunches, and a little luck to find the ancient cities of Troy and Mycenae. In addition, many ancient places (for example, Athens, Mycenae, Sparta) have kept their ancient names unto the present, making it clear where - in a general sense - the ancient places were.
Apart from this traditional method, however, **archaeologists today use a variety of heuristic **
tools in locating sites. **Systematic surface survey **(discussed in the next section) **reveals the variety of materials present across a region, provides **
information about what activities may have taken place there over time, and suggests the different cultural components represented. Artifact scatter patterns reflect the location of subsurface structures and are used to guide archaeological excavation. **When
structures are wholly invisible on the surface, researchers can employ ****the recent advances in archaeological technique to locate sites. ****Remote ****sensing, which includes aerial photography and satellite imagery of an area, may
accentuate subtle differences in landscape that are outside the spectrum of visible light, thereby suggesting subsurface buildings and features **(Figure 8.2). A dark soil stain on an aerial photograph may indicate the rich organic material of an ancient trash midden. Because the state of vegetation depends on soil fertility, abnormal crop marks may suggest underground walls, ditches, and roads. Slight nuances in shadow may point to elevation differences and ancient structures. Computers are now used to detect these subtle differences. Archaeologists can examine the pixel shapes and forms of known structures (e.g., temples) on digitized photographs and try to relate these to similar spectral emissions on the photograph of the survey area. Other projects have utilized **geophysical prospecting devices **to reveal more about the use of the area. A team may use **resistivity meters to discover the soil’s resistance to electrical current **and **magnetometers to detect variation in the magnetic properties **
of the soil. These tools reveal subsurface soil anomalies which often represent ancient features such as walls and trash middens. **Techniques are now so sophisticated that if the buried ****structure is well preserved, a team might be able to create a reliable plan of the invisible **
feature. If an excavation phase follows, this will certainly help guide the placement of test trenches and excavation grid.
These advances, along with continual chance discoveries through modern construction, ensure that there is never a shortage of researchable sites and little need to “go looking” for cities, treasures, and pretty things. Additionally, **modern archaeologists seldom
excavate sites to find what is there. **More often than not, the research questions and objectives guide the choice of what and where to excavate.