Shovel test pit

A shovel test pit (STP) is a standard method for Phase I of an archaeological survey. It is usually a part of the Cultural Resources Management (CRM) methodology and a popular form of rapid archaeological survey in the United States of America and Canada. A shovel test pit (STP) is a standard method for Phase I of an archaeological survey. It is usually a part of the Cultural Resources Management (CRM) methodology and a popular form of rapid archaeological survey in the United States of America and Canada. It designates a series of (c. 0.50 m or less) test holes, usually dug out by a shovel (hence the name) in order to determine whether the soil contains any cultural remains that are not visible on the surface. The soil is sifted or screened through 1/4' or 6 mm wire mesh to recover the artifacts. STPs will often be laid out over the project area in a grid-like fashion or in a consistently spaced line, creating a fairly systematic survey. Therefore, after the holes have been dug, one may map artifact densities over the project area, pinpointing the locations of possible sites where further investigation may be necessary. The interval at which the STPs are placed varies considerably and, in CRM at least, is sometimes prescribed by state regulations (in the U.S.) or is determined by the conditions in the field. The usual space between two STPs is 10 m or more but it can be considerably less (e.g., 1 m). The current standards in the United States is 30m or less. The depth of an STP depends on the depth at which either the bedrock or the sterile subsoil is found.