Frankly, I find difficulty to identify Graywacke. Theoretically, the rock is formed from synclinal deposits in the sea, and later uplifted and has generally three different layers of materials, the coarser at the bottom and finer at the top. It has to be grey too.
This rock sample is extracted 16m depth below ground level near Betong road junction. It appears to me more Sandstone and is light grey.
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