b'Ted Tynes best of Exploration geophysicsFeaturethe lower crust under the Eromanga Basin, Queensland, wereoperations on them, have improved immensely. One shudders interpreted as due to the top of a major intrusion. A procedureto think of the developments of the next 20 yearswill for estimating the thermal conductivity of saturated rocksgeophysicists still be necessary?was described, and a model for the thermal evolution of theFinally, I wish to express my appreciation of the devotion of the southern Cooper Basin was presented. authors and editors over the years who have put so much effort At Adelaide in 1988 (Middleton, ed., 1988), a structure for theinto the Journal.upper mantle under northern Australia was developed fromReferencesearthquake wave arrivals at closely spaced seismic arrays. A new method for stacking deep seismic data was outlined, and lateralFor references to papers not listed below, the ASEG Publications velocity variations in central Australia were found from seismicIndex, 19701987 should be consulted.profiles. Estimation of transfer functions for natural EM sources used in magnetotellurics was described. Asten, M., and Denham, J., eds (1988). Seventh Geophysical Conference and Exhibition, Melbourne, 24-29 September, Chant and Hastie (1988) recorded MT data from 1 kHz to .01 Hz1989: Papers and abstracts. Exp/or. Geophys. 20(1/2), 1346.at a site in the Bowen Basin, Queensland, for four months. DataBarton, C. E. (1988). Global and regional geomagnetic reference were analyzed by two methodsthe conventional method, andfields. Exp/or. Geophys. 19(3), 401416.a method due to Spitz which gives two principal axes. The twoBarton, C. E., Johnson, B. D., and Arnott, F. W. (1988). methods gave different resistivity-depth profiles. It was found thatGeomagnetic reference fields; base levels and diurnal divergence of the two Spitz axes indicated geological complexity. corrections to aeromagnetic data. Exp/or. Geophys. 19(3), At Melbourne in 1989 (Asten and Denham, eds, 1989),447452.conductivity under the Tasman Sea was derived from marineChant, I. J., and Hastie, L. M. (1988). A comparison of MT analysis electromagnetic measurements, a residual gravity map ofmethods based on data from a site in the Moreton Basin. Tasmania was presented, and a conductivity anomaly under theExp/or. Geophys. 19(3), 417422.Eyre Peninsula, SA, was shown to extend to the north. A positiveColeman, P. J., ed. (1978). Second Southwest Pacific Earth gravity anomaly in the Sydney Basin was interpreted as a maficScience Symposium and IGCP Project Meeting, Sydney, body in basement extending to 13 km depth. December 1977. Bull. Aust. Soc. Exp/or. Geophys. 9(3), 69161.Cull, J. P. (1989). Airborne SIROTEM. Exp/or. Geophys. 20(3), Wright et al. (1989) described the recording of seismic399402.expanding-spread reflections to a maximum offset of 25Dooley, J. C., ed. (1990). Engineering Geophysics Workshop, km, in the northern part of the Amadeus Basin. AlthoughAdelaide, February 1988. Exp/or. Geophys. 21(1/2), 1143.some of the outer shots could not be used because of lackEadie, E.T., and Staltari, G., eds (1987). Downhole EM methods. of coherence, a good vertical velocity profile was derived forExp/or. Geophys. 18(1987), 247351.the sediments to a depth of 8.6 km. Two low-velocity zonesEdwards, R. N. (1983). An approximate model of the were identified, at depths of about 3.8 and 8.0 km. The mainmagnetometric resistivity and magnetic IP responses of reflecting horizons were correlated with known sedimentarydipping dykes beneath a conductive overburden. Bull. Aust. formations. Soc. Exp/or. Geophys. 14(2), 3035.Emerson, D. W., ed. (1979a). Applied Magnetic Interpretation Symposium, Sydney, August 1978. Bull. Aust. Soc. Exp/or. Conclusion Geophys. 10(1), 1139.Emerson, D. W., ed. (1979b). ASEG First Biennial Conference, The ASEG publications present a picture of Australian, and toAdelaide 1979. Bull. Aust. Soc. Exp/or. Geophys. 10(3),some extent of overseas, developments in many branches of181236.geophysics. To the topics reviewed above, could be added manyEmerson, D. W., and Falvey, D. A., eds (1977). Two-dimensional more, including remote sensing, geothermal investigations,regional gravity investigations, University of Sydney, June underground water search, engineering site investigations,1977. Bull. Aust. Soc. Exp/or. Geophys. 8(4), 97160.marine geophysics, detection of ores by vapour emissions, andFacer, R. A. (1971). When the dipole field dwindles away. Bull. computer-aided display of geophysical data. Aust. Soc. Exp/or. Geophys. 2(2), 2933.In the review process, I was continually reminded of interestingFalvey, D. A., and Packham, G. W., eds (1975). First Southwest papers read long ago but half (or more) forgotten, and I alsoPacific Workshop-Symposium, the University of Sydney - became very interested in reading gems which I had skipped atFebruary 1975. Bull. Aust. Soc. Exp/or. Geophys. 6(2/3), 3183.the time of publication, through lack of time or not being in myGray, D. (1971). Geoseis shooting in the Cooper Basin. Bull. Aust. field of interest at the time. Soc. Exp/or. Geophys. 2(2), 1628.Gunn, P. J., ed. (1985). Fourth Geophysical Conference and Although not mentioned specifically in the above stories,Exhibition, Sydney, 912 September 1985. Exp/or. Geophys. the influence of developments in computing hardware and16(2/3), 157334.software has obviously been vital in the facilitation of nearly allLee, T., and Thomas, L. (1988). A review of the application of of them. Digital computers were well established in Australiaanalytical methods to the prediction of TEM field response. by 1970, representing a major improvement on the situationExp/or. Geophys. 19(3), 423434.only ten years previously. But now, with a personal computer onMacnae, J., and Irvine, R. J. (1988). Inductive source resistivity: every geophysicists desk which can equal the performance ofa tool for outlining silicification in gold exploration. Exp/or. the largest computers of 2530 years ago, and connections toGeophys. 19(4), 471480.even larger computer systems or networks, and the portabilityMegallaa, M. (1989). Depth conversion by the use of forward of powerful computers for use in the field, the possibilities ofand inverse 20 raypath modelling and compensation for the handling huge quantities of data and performing complexheterogeneity of the earth. Exp/or. Geophys. 20(4), 445-467.47 PREVIEW FEBRUARY 2020'