41. Further conservation work and a geophysical survey were carried out in 1999 and 2000 by the Cotswold Archaeological Trust. 42. In 1986 he set up Geophysical Surveys of Bradford ( GSB ), an independent consultancy in geophysics for archaeology. 43. Further to this and with the agreement of Durham University, Historic Scotland funded a geophysical survey of Palace Green. 44. It was delineated and named by Joseph Curray and David Moore following a geological and geophysical survey in 1968. 45. The henge was discovered at the Hill of Tara archaeological complex in geophysical surveys carried out between 1999 and 2001. 46. In 1997, a geophysical survey and aerial imaging was undertaken which revealed wall lines of buried buildings and former ponds. 47. Petroleum exploration within the basin has been minimal, consisting of a small number of geophysical surveys and two stratigraphic wells. 48. Due to its rocky landscape and minerals, a volcanic and geophysical survey was conducted by the Geological Survey of Pakistan. 49. In 1974 the State of Alaska's Division of Geological & Geophysical Surveys estimated that the field held of natural gas. 50. Niugini Mining said a second drilling rig is being mobilized and further drilling will take place following the completion of geophysical surveys .
