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  • This excursion guide provides an introduction to the fluvial sedimentology of theTriassic- Jurassic Bundamba Group in the northern part of the Clarence-MoretonBasin which is situated in the southeastern part of Queensland (Fig.1). The excursion guide is written so that the major exposures of fluvial rocksbetween Ipswich and Toowoomba can be examined. Descriptions of fourteenstops are included in the guide and if all the outcrops are inspected the total roaddistance covered is about 350 km, with Brisbane as the starting and finishingpoint. Figure 2 shows the excursion route and position of the stops. The itinerarygiven at the end of this guide includes an appropriate number of stops based on aone day excursion. The area is readily accessible with most of the sediments exposed in roadcuttings along the Warrego Highway; others occur in cuttings on theClifden-Gatton Road and the Murphys Creek Road, small access roads branchingoff the Warrego Highway . All these roads provide sealed, all weather access.Great care should be taken when examining cuttings on the Warrego Highway asit carries a large volume of traffic.The Main Roads Department generally requestthat appropriate signs be erected during road cutting examination on mainhighways. There are several small towns along the Warrego Highway thatprovide accommodation and where provisions may be purchased. The city ofToowoomba is a convenient stepping off point to visit geological features in thenorthern Clarence-Moreton Basin. The data used in compiling this excursion guide is largely derived from theAustralian Geological Survey (AGSO) Bulletin 241, (Wells & O'Brien, in press),and in particular an included paper on the sedimentology of the Bundamba Group( O'Brien & Wells, in press). The reader is referred to Wells, O'Brien, Willis & Cranfield (1990), Cranfield,Hutton and Green (1989), and Cranfield, Schwarzbock and Day (1976), fordescriptions of the regional geology of the northern part of the Clarence-MoretonBasin.

  • 22-1/G56-13/5 Vertical scale: 300

  • 22-1/E55-5/8 Vertical scale: 100

  • The Bureau of Mineral Resources, Geology & Geophysics (BMR) (now Australian Geological Survey Organisation (AGSO)), Department of Primary Industries & Energy, Australian Government, conducted the Bowen Basin Seismic Survey during July to October 1989. The major aim of the seismic survey was to record deep seismic reflection data across the northern part of the Bowen Basin, to test geological (extensional) models for the formation of the Bowen Basin. The locations of the seismic lines were determined in consultation with exploration companies and the Department of Resources Industries (now Dept. of Minerals & Energy),Queensland State Government. The requirement that the seismic lines be targeted andconstrained to follow a proposed geological corridor was a controlling factor in thepositioning of the seismic lines. The deep seismic reflection survey by the BMR recorded 254 km of 8-fold CDPseismic data, along three seismic lines. Line BMR89.B01, 157 km in length, crossed major features including the Comet Ridge, Bowen Basin, Duaringa Basin and Gogango OverfoldedZone. Line BMR89.B02 was recorded as an easterly extension of Line BMR89.B01, positioned further north due to ease of access. Line BMR89.B03 was positioned to providea north-south line crossing inferred transfer faults of the geological corridor followed by LineBMR89.B01. One expanding spread consisting of 9 shots was recorded on Line BMR89.B01centred at SP 2025 with maximum offsets of 25.6 km. Gravity observations were made at 480 m intervals on all seismic lines.

  • E54/B1-7661 Contour interval: 50

  • Resources, Geology & Geophysics (now Australian Geological Survey Organisation (AGSO))conducted a seismic reflection, seismic crustal refraction and gravity survey in southeastern Queensland from August to November 1986. The primary objective of the survey was to complete seismic reflection coverage in the Dalby-Toowoomba area between Traverse 14 and Traverse 16 recorded during the BMR S.E. Queensland seismic survey in 1984. Secondary objectives, subject to survey progressincluded recording additional seismic reflection data east of Traverse 16 (1984) over the Beenleigh Block south of Brisbane, and a 100 km of seismic reflection data south of Mitchellover a deep crustal seismic reflection feature delinated on Traverse 14 (1984) centred at SP4030. Overall the survey objectives would allow the completion of a continuous deepcrustal seismic reflection profile of 1110 km length across southern Queensland, the basis of a lithospheric transect study in the southern region of Queensland. The survey obtained a total of 181 km of 6-16 fold CMP seismic reflection data in theBeenleigh, Darling Downs and Mitchell areas, using the Sercel SN368 seismic acquisition system. Both the primary and secondary objectives were achieved, although equipmentfailures were a major problem in causing decreased production rates. Gravity observations were made at 360m intervals along all traverses. The record presents operational information on the seismic reflection survey and preliminary sections of seismic traverses.