Nature conservation

Biodiversity Reform

Nandewar - subregions

Subregions of the Nandewar Bioregion
SubregionGeologyCharacteristic landformsTypical soilsVegetation
PeelFine grained Silurian to Devonian sedimentary rocks. Strongly folded and faulted with marked northwest alignment. Areas of sub-horizontal Carboniferous shales and sandstones in the north. Limited areas of basalt cap from the Nandewar and Liverpool Ranges are included. Linear outcrops of serpentinite and scattered bodies of limestone.Low peaked hills with north-westerly alignment. Basalt caps of dissected flows, moderate slopes and flat river valleys with alluvium.



Karst landscapes in limestone.

Shallow stony soils on ridges. Texture contrast soils on almost all slopes shifting in colour from red brown on upper slopes to yellow on lower slopes. Black earths on basalt. Dark, alkaline, pedal clays on limestone. Serpentinites have shallow stony profiles with concentrations of elements that are toxic to many plants. Alluvial loams and clays with moderate to high fertility in alluvium. White box grassy woodlands, with yellow box and Blakely's red gum on lower slopes. Rough-barked apple and yellow box on flats. River oak and some river red gum along major streams. Patches of red stringybark and red ironbark on steeper slopes in the east. Silver-leaved ironbark on basalt caps, white cypress pine and kurrajong on stony areas in the west and north.



Very large grass trees on serpentinite.

KaputarRemains of a Tertiary central volcano with a thick sequence of basaltic lavas. Rugged steep rocky hills and peaks, exposed volcanic plugs and dykes. Benched slopes mark different lava flows. Frequent rock outcrop interspersed with shallow stony brown loams. Black earths on lower slopes and valleys. Snow gum and manna gum on the highest tops with silver-topped stringybark, broad-leaved stringybark and red stringybark.



Black cypress pine and white cypress pine with silver-leaved ironbark, narrow-leaved ironbark on slopes. Kurrajong, yellow box, white box, rough-barked apple and Blakely's red gum on lower slopes.

Inverell BasaltsExtensive basalt flows from a Tertiary lava field eruption centre. Tertiary sub-basaltic sands and gravels exposed at the edges of the flows. Small areas of granite and Palaeozoic and Mesozoic sandstones. Undulating low hills and the dissected edge of the New England Plateau. Long hillslopes are stepped across different lava flows and have a marked break of slope where buried sands and gravels are exposed. Soils on sedimentary rocks similar to Peel Subregion. Brown to black pedal loams and clays on basalts thickening downslope, high nutrient levels and excellent water holding capacity. Exposed Tertiary sands have coarse sandy soils that may develop podsol pans. White box with silver-leaved ironbark and red ironbark. Yellow box, rough-barked apple and Blakely's red gum and white cypress pine on lower slopes. Manna gum in valleys and river oak on streams.
Northern ComplexLarge areas of coarse grained granite and gently folded Carboniferous quartz sandstones and shale. Isolated limestone outcrops.Low hills and ranges, more rugged on granites with abundant rock outcrop and tors. Short, steep gorges of major rivers. Karst landscapes on limestone. Harsh texture contrast soils with subsoils prone to gully development. Gritty shallow profiles on granite. Dark, alkaline, pedal clays on limestone.Red ironbark with white cypress pine, grey box, forest red gum, and bull oak on granites. Lower colluvial slopes as above with pale bloodwood, and hill red gum. River red gum, river oak and rough-barked apple on creeks. Silver-leaved ironbark and white cypress pine on shale and sandstone with white box on lower slopes. Poplar box, brigalow. Bulloak on finer alluvium, forest red gum and Moreton Bay ash on coarser alluvium. Diverse understorey shrubs.

From Morgan and Terrey 1992

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Page last updated: 26 April 2016