Calwynyardah land system (Clw), size: 1736km2, publication source: wky


Cockatoo land system (Coc), size: 2378km2, publication source: OVC



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Cockatoo land system (Coc), size: 2378km2, publication source: OVC


Gently undulating timbered sandy country in the north-western part of the Ord-Victoria survey area.

cockatoo land system is located near kununurra and north of kununurra to the coastline.

Location map showing coverage of Cockatoo land system defined by black region.



State land type: Sandplains with eucalypt woodlands and spinifex/tussock grasses.

Geology: Sandstone, calcareous sandstone, calcareous conglomerate, and minor limestone; Permian, Lower Carboniferous, Upper Devonian, and Ordovician-Cambrian (Carlton Group).

Geomorphology: Coastal erosional plains.

Drainage: Widely spaced insequent stream pattern, shallow depressions may be waterlogged or flooded for short periods.

Land management: System supports pastures which are only moderately favoured by livestock and are generally stable with low susceptibility to erosion. Fire management programs desirable; in the Kununurra area unit 2 has potential for horticultural use.

landscape picture of a red sandy road with eucalyptus woodlands on either side

Image of gently undulating sandplains which are the major unit (unit 2) of the Cockatoo land system have deep red sandy soils and support eucalypt woodlands. Photo: Henry Smolinski DAFWA



landscape block diagram with location of different land units drawn to scale.

Stylised block diagram showing location of land units for the Cockatoo land system (numbers on diagram represent land units in table below)



Table of Cockatoo land system – land units. + Pasture types described in Appendix 1; Note: Proportions and occurrence of pasture types within land units are subject to change over time due to invasion by native and introduced species, seasonal conditions, fire frequency and grazing management.

Unit

Approx.
area
(%)

Landforms

Soils

Vegetation

Pasture type+

1

5

Very bouldery low hills

Sandstone boulders with pockets of sandy soils.

Stringybark - bloodwood woodland (Eucalyptus tetrodonta, Corymbia dichromophloia, E. miniata, C. ferruginea, E. aspera) or deciduous sparse low woodland (Xanthostemon paradoxus, Owenia vernicosa, Terminalia spp.), both with upland tall grass (Sorghum stipoideum, Triodia bitextura, Triodia stenostachya).

ASHP

2

80

Gentle slopes and crests of gently undulating landscape

Cockatoo - deep red sand; and Pago - deep yellow sand; small areas of Cullen - greyish sand merging into mottled yellow sand.

Stringybark - bloodwood woodland E. tetrodonta, E. miniata, C. dichromophloia) with upland tall grass (Sorghum stipoideum, Triodia bitextura).

LCSP

3

5

Small isolated areas in gently undulating landscape

Tippera - brown sandy loam merging into dark red clay.

Northern box - bloodwood woodland (E. tectifica, C. foelscheana, C. confertiflora) with upland tall grass (Sorghum stipoideum).

LCSP

4

5

Lower slopes and shallow drainage floors

Pago - deep yellow sand; and Cullen - greyish sand merging into mottled yellow sand.

Stringybark - bloodwood woodland E. tetrodonta, E. miniata, C. dichromophloia) with upland tall grass (Sorghum stipoideum, Triodia bitextura).

LCSP

5

5

Shallow linear depression lines

Hooper - greyish surface over mottled hard clay.

Marrakai mid-height grass (Eriachne spp., Themeda triandra).

OTHP

landscape picture of mainly tall grasses below the scattered trees with three termite mounds

Image of Sorghum species and Triodia bitextura are common species in the grassy understorey of Cockatoo land system. Photo: DAFWA


Cockburn land system (Cok), size: 2308km2, publication source: OVC


Several small patches of undulating to low shaly country with sparse shrub vegetation scattered throughout the Ord-Victoria survey area.

cockburn land system is scattered around kununurra and west of kununurra and about 150 km north west of kununurra.

Location map showing coverage of Cockburn land system defined by black region.



State land type: Hills and lowlands with eucalypt woodlands and spinifex.

Geology: Mainly shales and siltstones; Adelaidean and Carpentarian sediments.

Geomorphology: Coastal erosional plains.

Drainage: Rectangular and angular stream pattern of moderate intensity; unit 3 may be flooded for short periods after heavy rains.

Land management: Supports curly spinifex pastures which, when young, are moderately attractive to cattle; mature stands are unattractive. Land system not usually prone to degradation or erosion but control of grazing pressure and frequency of burning is desirable.

landscape picture of tall grasses of spinifex with scattered small paperbark trees on undulating land

Image of small paperbark trees (Melaleuca spp.) and curly spinifex (Triodia bitextura) are common on shaly slopes (units 1 & 2) of the Cockburn land system. Photo: Andrew Craig DAFWA



landscape block diagram with location of different land units drawn to scale.

Stylised block diagram showing location of land units for the Cockburn land system (numbers on diagram represent land units in table below)

Table of Cockburn land system – land units. + Pasture types described in Appendix 1; Note: Proportions and occurrence of pasture types within land units are subject to change over time due to invasion by native and introduced species, seasonal conditions, fire frequency and grazing management.

Unit

Approx.
area
(%)

Landforms

Soils

Vegetation

Pasture type+

1

70

Moderate to gentle slopes

Rock outcrops and shallow, very gravelly, skeletal soils.

Trees absent, or paperbark sparse low woodland (Melaleuca spp.) with spinifex (Triodia bitextura).

CAHP 50%
CSPP 50%

2

15

Gentle lower slopes on shale

Elliott - shallow grey sandy loam merging into mottled yellow clay.

Paperbark sparse low woodland (Melaleuca spp. with upland tall grass (Sorghum stipoideum, Triodia bitextura).

CSPP

3

13

Alluvial depressions or flats fringing streamlines

Elliott -deep grey sandy loam merging into mottled yellow clay.

As for unit 2 also Chrysopogon fallax.

CSPP 50%
RGRP 50%

4

2

Small stream channels





Fringing communities.

FRIP

landscape picture of grassy understory with many trees and some termite mounds before a large range

Image of gentle slopes of Cockburn land system flank the spectacular Cockburn Ranges (Pinkerton land system) near Wyndham. Photo: David Ribbans (Flickr.com)




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