Darwin City and its suburbs are bounded along the western shore by sea cliffs, between 1-30 m in height, and shore platforms at the base of headlands along with small pocket beaches and some longer beaches up to 10 km in length.
The low lying coastal cliffs at Nightcliff consist sedimentary rock commonly known as Porcelainite which as been naturally eroded, largely by wave action from the ocean to form horizontal to gently undulating bedded strata of varying colours with large and small caves along the coast
Porcelanite is a hard, dense rock that takes its name from its resemblance to unglazed porcelain. Frequently porcelanite is an impure variety of chert containing clay and calcareous matter; when of this nature it is composed chiefly of silica.
Porcelanite
The porcelanite of some authorities is a silicified tuff, a rock composed of volcanic fragments that has been altered to silica, or even metamorphosed marl, calcareous rock fragments altered by heat and pressure. One porcelanite, common in lignite deposits, is formed from the fusion of shales and clay on the floor, walls, and roof of burned coal seams.
Q1 Describe the rocks in your own words including size, colours you see and texture.
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