|Subregions of the Brigalow Belt South Bioregion|
|Subregion||Geology||Characteristic landforms||Typical soils||Vegetation|
|Inglewood Sandstones||Deeply weathered and lateritised Jurassic-Cretaceous sandstone with associated colluvial lower slopes and alluvial plains.||Undulating low hilly country. ||Iron rich uniform profiles on hillcrests merging to harsh texture contrast profiles on lower slopes. Uniform sandy alluvium in stream lines.||Major vegetation types include narrow-leaved ironbark on hillsides, white cypress pine and bull oak on harsh texture contrast soils in gently undulating parts and poplar box on lower slopes and flats. Minor areas of brigalow-belah also occur.|
|Moonie-Barwon Interfluve |
One land system only.
|Cretaceous sandstones and claystones that are a small part of the Surat Sandstones subregion in Qld. ||Low rounded hills, relief to 10m, local dendritic drainage patterns.||Stony red earths often with a gravel pavement. Soils become deeper downslope and accumulate calcium carbonate in drainage lines.||Poplar box, wilga, white cypress pine, budda, warrior bush, ironwood, and belah with mixed grasses underneath.|
|Northern Basalts||Tertiary basalts over Jurassic quartz sandstones and alluvial sediments derived from these.||Undulating low stony hills, long slopes with sandy wash and heavy clays in the valley floors.||Black loams on basalt ridges, deep sands on sandstone and texture contrast soils on slopes. Heavy grey clay on alluvial flats.||Brigalow, belah, whitewood, wilga, budda and poplar box on basalt hills. Silver-leaved ironbark, spotted gum and smooth-barked apple on stony hills. River red gum, belah myall and poplar box on basalt flats. Silver-leaved ironbark and white cypress pine in sandstone rocks, smooth-barked apple, white cypress, Blakely's red gum, Moreton Bay ash, poplar box, wilga, rough-barked apple, bull oak, on lower sandstone slopes. White box, with silver-leaved ironbark, white wood, bull oak and brigalow on alluvial clays. River red gum on all streams.|
|Northern Outwash||Tertiary and Quaternary alluvial fans and stream terraces.||Sloping plains with alluvial fans that are coarser and steeper than the Gwydir Fans downstream.||Red loams and heavy brown clays.||Poplar box with white cypress pine, wilga and budda on red soils, belah and brigalow on brown clays.|
|Pilliga Outwash||Quaternary alluvial fans largely derived from Jurassic quartz sandstone. ||Long slopes broken by sandy abandoned stream channels, patches of heavy grey clay and incised stream channels.||Deep texture contrast soils with harsh clay subsoils, grey clay with gilgai.||Poplar box, pilliga box, Blakely's red gum, white cypress pine and mugga on coarser soils. Belah, brigalow, yarran, budda, wilga whitewood, rosewood on heavier soils. River red gum in creek lines, occasional silver-leaved ironbark, white box and fuzzy box in run-on sites.|
|Pilliga||Horizontal Jurassic quartz sandstones, limited shales, Tertiary basalt caps and plugs plus the sediments derived from these rocks.||Stepped sandstone ridges with low cliff faces and high proportion of rock outcrop. Long gentle outwash slopes intersected by sandy stream beds and prior stream channels. A few patches of heavy clay. Includes the spectacular mountain landscape of volcanic domes, plugs and dykes in the Warrumbungles.||Shallow black earths and red loams on basalts. Extensive harsh texture contrast soils, linear patterns of deep yellow sand, stony red brown earths.||White box with white cypress pine and kurrajong on the basalt hills. Blue-leaved ironbark, white gum, black cypress pine, whitewood, and rough-barked apple on stony sandstone plateau and streams. |
Narrow-leaved ironbark, white cypress pine, red stringy bark, patches of mallee and broom heath on gentler sandstone slopes. Pilliga box with grey box, poplar box, fuzzy box, bull oak, rosewood, wilga and budda on heavier soils in the west and north. River red gum lines all streams.
|Liverpool Plains||Quaternary alluvial plains and outwash fans derived from Tertiary basalts. Permian and Triassic quartz sandstones with minor basalt caps. ||Undulating hills and sloping plains with alluvial channels and floodplains.||Extensive black earths on low angle slopes. Brown clays, alluvial soils and red or brown texture contrast soils on slopes below sandstone.||Plains grass, panic, windmill grass and blue grass on black earths with occasional white box, yellow box, poplar box and wilga. White box and white cypress pine with rough-barked apple, hill red gum, occasional belah and mulga on texture contrast hillslope soils.|
|Liverpool Range||Multiple Tertiary basalt flows with intervening sediments and ash fall material, overlying Jurassic quartz sandstones and shale.||Undulating plateau top with steep margins grading to long footslopes. ||Stony red brown loams on ridges, shallow stony clay soils on steep slopes grading to deep black earths on lower slopes. ||Plateau: open forest of silvertop stringybark, manna gum and mountain gum. Snow gum in cold air drainage hollows. Tallow wood, blackbutt and blue gum on eastern slopes, small areas of vine forest. |
Slopes: White box with rough-barked apple, belah in the creeks on northern aspects. Yellow box and Blakely's red gum on southern aspect.
|Talbragar Valley||Near horizontal Mesozoic quartz sandstone, conglomerates and shales with minor Tertiary basalt caps and extensive alluvial wash plains. ||Residual rocky hills, undulating long slopes and wash plains, wide valley floors with sandy streams. ||Thin stony loams and texture contrast soils over most of the landscape with deeper sands and brown earths on valley floors.||Narrow-leaved ironbark, white cypress pine, white box on hills and slopes. Patches of black cypress pine, hill red gum, occasional kurrajong and scrubby acacia in rocky outcrops. Grey box, yellow box, rough-barked apple on valley floors. River red gum on larger streams and river oak on tributaries.|