North American Database of Archaeological Geophysics

Database Report:

Site Name: Twelve Mile House; Site Number: 5AH121; County: Arapahoe; State: CO; Country: USA; Ownership: State; Landform: Cherry Creek Floodplain;

Date of Site: AD 1865-1890; Period Type: Historic; Culture: Euroamerican; Site Type: Stage Stop, Historic Structure; Site Size: 14,400 sq m;

Survey Type: Magnetometry;

Instrument: EG&G Geometrics G-856 Memory-Mag Proton Precession Magnetometer; Sampling Interval: ~4.6 x 4.6 m; Prospecting Depth: 1-1.5 m; Area Surveyed: 8,361 sq m; Date of Survey: Summer 1990; Land Cover Type: _____; Ground Truthing: Yes;

Graphics/Imagery:

Gradient field plot for magnetometer;

 

Survey Type: Conductivity;

Instrument: Geonics EM-31 Non-Contacting Terrain Conductivity Meter; Sampling Interval: ~4.6 x 4.6 m; Prospecting Depth: up to 6 m; Area Surveyed: 8,361 sq m; Date of Survey: Summer 1990; Land Cover Type: _____; Ground Truthing: Yes;

Graphics/Imagery:

Out-of-phase (conductivity) component plot for EM-31;

  

Survey Type: Ground-Penetrating Radar;

Instrument: GSSI SIR System 3 with 80 and 900 MHz antennas; Sampling Interval: 6 transects positioned according to magnetic and conductivity results; Prospecting Depth: 1.4 m; Area Surveyed: 6 lines; Date of Survey: Summer 1990; Land Cover Type: _____; Ground Truthing: Yes;

Graphics/Imagery:

GPR profile of undisturbed area along Line 3;

 Anomalous GPR profile along Line 6;

Project Name: Twelve Mile House (5AH121), CO;

Reference: De Vore, S.L. (1992). Geophysical Applications in Archaeology: A Case Study at the Twelve Mile House (5AH121), Arapahoe County, Colorado. Southwestern Lore 58(1):1-16 (used with permission).

Survey by: Steven L. De Vore, National Park Service; William G. Brennan and Timothy M. Deignan, EBASCO Services, Inc.

Survey for: National Park Service;

Report Location: NA; Report Type: Journal Article;

Abstract/Summary