Page 49 - DILMUN 14

ln : Proceelings of the
24th١ lnternational ٨rchaeometry Symposin

By : Jaqucline S. Olin and Janes Blackman
Smithsonian Institution Press,

Waslington, D.C., 1986, pp ١87-200

Noncontacting Terrain Conductivity
Measurements at Oal?at al-Bahrain

By

B. Frohlich, M. Kervran, ٧. Caruso and K. MCormick

Brano Frohlic, Department of Anthropology, Smithsonian Institution, Washington, D.C.
20560, USA.
Moique Kervran, Mission Archaeologique Frangais ‫ ﺍ‬Bahrain et Oman, Sorbonne, Paris,
France. Vincent Causo, National Mapping Division, U.S. Geological Survey, Reston,
Virginia, USA.
Keneth McCorick, Office of Information Resource Management, Smithsonian Institu-
tion, Washington, D.C. 20560, USA.

ABSTRACT
Oal'at al-Bahrain is located on the northern part of Bahrain lsland in the western

Arabian Gulf. Excavations by Danish archaeologists and presently by Mission
Archeologique Francaise a Bahrain et Oman have produced results indicating
continuing human occupation for the last 5,000 years.

Electromagnetic surveys were carried out in 1982 and 1983 to determine the
location of large harbor anldor canal systems, human burials, and wall structures.
An EM-31 noncontacting terrain conductivity meter was applied in two recording
modes: (1) vertical dipoles with a depth penetration of approimately 6 meters, and
(2) horizontal dipoles with a penetration of approximately 2.5 meters. Two plots. of
43 by 75 metesr and 46 by 73 meters were measured using a 2-meter interval grid.
Conductivity data at each grid point were used to produce contour maps showing
the conductivity variations in both modes. Additionally, 15 traverses consisting of
one, two, or three parallel lines were measured at either 1 or 2-meter intevrals
'(2771 data points). Based on the ifeld analysis, it was possible to identiyf areas

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