North American Database of Archaeological Geophysics

Database Report:

Site Name: Effigy Mounds National Monument (1); Site Number: _____; County: Clayton; State: IA; Country: USA; Ownership: Federal - NPS; Landform: River Terrace;

Date of Site: AD 500-1300; Period Type: Prehistoric; Culture: Late Woodland; Site Type: Mounds; Site Size: 1,481 acres;

Survey Type: Ground Penetrating Radar;

Instrument: GSSI SIR System-7, with model 3102 315 MHz antenna; Sampling Interval: 15 m transect; Prospecting Depth: _____; Area Surveyed: _____; Date of Survey: 9-May-1999; Land Cover Type: Forest-Clearing; Ground Truthing: No;

Graphics/Imagery:

Survey Type: Self-Potential;

Instrument: Tinker and Raso Model 3A Electrodes; Homemade Electrodes; Sampling Interval: Two passes with each instrument over a 15 m transect, readings every 0.5 m; Prospecting Depth: _____; Area Surveyed: _____; Date of Survey: 7-May-1999; Land Cover Type: Forest-Clearing; Ground Truthing: No;

Graphics/Imagery:

Measurements of soil voltage using two different types of electrodes;

Corrections to the self-potential measurements acquired with plaster electrodes;

Survey Type: Induced Polarization;

Instrument: L and R Instruments Model MiniRes Meter; Sampling Interval: 15 m transect x 0.5 m; Prospecting Depth: 0.5 m; 1 m; 1.5 m; Area Surveyed: _____; Date of Survey: 8-May-1999; Land Cover Type: Forest-Clearing; Ground Truthing: No;

Graphics/Imagery:

Survey Type: Electrical Resistivity Pseudosections;

Instrument: L and R Instruments Model MiniRes Meter; Gossen Geohm 3; Sampling Interval: 15 m transect x 0.5 m; Prospecting Depth: 0.5 m to 2 m; Area Surveyed: _____; Date of Survey: 6-May-1999; 8-May-1999; Land Cover Type: Forest-Clearing; Ground Truthing: No;

Graphics/Imagery:

The electrical resistivity on line 1, taken with three different electrode spacings;

A resistivity pseudosection of line 1;

Survey Type: Seismic Refraction;

Instrument: Geometrics Model ES-1225; Sampling Interval: 2 lines spaced 5 m apart of 12 geophones; geophones were at intervals of 1 m with impact points at both ends; Prospecting Depth: _____; Area Surveyed: _____; Date of Survey: 15-May-1999; Land Cover Type: Forest-Clearing; Ground Truthing: No;

Graphics/Imagery:

Seismic record 245 showing the increasing delay in the arrival of the seismic wave at greater distance;	Reversed seismic record 246;
The dispersion of the seismic wave from recording 250;	A Rayleigh wave pseudosection measured on linear mound 20;

Project Name: Effigy Mounds, IA (1);

Reference: Bevan, B. (1999). Some Geophysical Experiments at Effigy Mounds. Geosight, Weems, Virginia. Submitted to the Midwest Archeological Center, U.S. National Park Service, Lincoln, Nebraska.

Survey by: Bruce Bevan, Geosight, 356 Waddy Drive, Weems, VA, 22576.

Survey for: U.S. National Park Service;

Report Location: Midwest Archeological Center, Lincoln, NE; Report Type: CRM Report;

Abstract/Summary