Accession Number : ADA242618


Title :   Evaluation of Magnetic Anomalies Located in Lower Bayou Teche, St. Mary Parish, Louisiana


Descriptive Note : Final rept,


Corporate Author : GOODWIN (R CHRISTOPHER) AND ASSOCIATES INC NEW ORLEANS LA


Personal Author(s) : Goodwin, R C ; Athens, William P ; Saltus, Allen R , Jr


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a242618.pdf


Report Date : Jul 1991


Pagination or Media Count : 110


Abstract : This report presents results of testing and assessment of eleven previously recorded magnetic anomalies located in Lower Bayou Teche, St. Mary Parish, Louisiana. Maintenance dredging of Lower Bayou Teche may impact several of the eight anomalies evaluated in this study. Objectives of the study were to conduct detailed surveys and assessments of eight previously located anomalies (Goodwin, Hinks et al. 1990). These were Anomalies 8, 13, 24a, 29, 30, 31, 33, and 58. Three order anomalies, Anomaly nos. 23, 24b, and 55 were also briefly examined. Methods used during survey included relocation of each anomaly with a magnetometer; informal magnetic and fathometer survey of each anomaly and its vicinity, physical search of the river bottom at each anomaly location; use of a metal detector to assess the depth of the magnetic source of each anomaly; probing of the river bottom to locate buried structures; and limited excavation with a jet probe to document the source, nature, and research potential of each of the eight anomalies. Two of the anomalies, Anomaly no. 30 and 58 could not be relocated. Four of the anomalies apparently are associated with modern debris: Anomaly nos. 8, 13, 29, and 31. Anomaly no. 33 appears to be an isolated object. Evidence of structure was observed 14 to 15 ft below water surface, however, it occurs below the project impact zone. One archeological site, the Anomaly no. 23/24 Complex (Site 16SMY76) was defined. It consists of two wooden barges and some twentieth century bridge remains.


Descriptors :   *TEST AND EVALUATION , ANOMALIES , SOURCES , POSITION(LOCATION) , PROBES , MAGNETIC FIELDS , IMPACT , PHYSICAL PROPERTIES , SITES , ISOLATION , SURVEYS , SEARCHING , DOCUMENTS , RELOCATION , RIVERS , DEPTH FINDERS , ARCHEOLOGY , EXCAVATION , DREDGING , BOTTOM , WOOD , BARGES , LOUISIANA , UNDERGROUND STRUCTURES , METAL DETECTORS , MAGNETIC ANOMALIES , MAINTENANCE


Subject Categories : Humanities and History
      Magnetic & Electric Fld Detection & Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE