This Earth Cache is located on the outskirts of Gowar. Gowar is a approximately 18kms north east of St Arnaud.
Gowar's rolling plains have been determined to be of Ordovician granite and granodiorite. Quaternary alluvium Gently undulating plains on granite occur between Coonooer Bridge and Rheola adjoining steep granitic hills. Red sodic duplex soils predominate on the lower slopes. However, deeply weathered mottled duplex soils on the upper slopes also account for a substantial proportion of the landscape. A siliceous hardpan usually restricts perviousness and water-holding capacity.
Granite has a felsic composition and is more common in recent geologic time in contrast to Earth's ultramafic ancient igneous history. Felsic rocks are less dense than mafic and ultramafic rocks, and thus they tend to escape subduction, whereas basaltic or gabbroic rocks tend to sink into the mantle beneath the granitic rocks of the continental cratons. Therefore, granitic rocks form the basement of all land continents.
Amphibole
Granite is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture. The word "granite" comes from the Latin granum, a grain, in reference to the coarse-grained structure of such a holocrystalline rock. The term 'granite' also applies to a group of intrusive igneous rocks with similar textures and slight variations on composition and origin. These rocks mainly consist of feldspar, quartz, mica, and amphibole minerals, which form interlocking, somewhat equigranular matrix of feldspar and quartz with scattered darker biotite mica and amphibole (often hornblende) peppering the lighter color minerals. Occasionally some individual crystals (phenocrysts) are larger than the groundmass, in which case the texture is known as porphyritic. A granitic rock with a porphyritic texture is known as a granite porphyry. Granites can be predominantly white, pink, or gray in color, depending on their mineralogy. By definition, granite is an igneous rock with at least 20% quartz and up to 65% alkali feldspar by volume.
This area has been largely cleared to allow cropping and grazing. The droughty nature of the light-textured surface soil increases an already-severe sheet erosion hazard, as indicated by the numerous sandy creeks of the region. Deep weathering, erosion and shallow soils result in low productivity and severe land deterioration hazards. The Gowar and Dunluce (south of Gowar) land systems have many similar features. However, they differ significantly in soil types, vegetation and susceptibility to deterioration.
Q1 At this location, how would you describe the landscape (eg hills, rolling plains, forest etc)
Q2 There is a significant rock 'face' here on the roadside. Describe the colours you see and the size of the rocks.
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References ~ Victorian Resources Online & wikipedia