Dight's Falls is just downstream of the junction of the Yarra River with Merri Creek. The river is constricted to be 800,000 volcanic, basaltic lava flow and a much older steep, silurian sedimentary spur. The north side also contains abundant graptolite fossils in sedimentary sandstone. It was believed the only fall on the River although it connects creeks and even lakes throughout the course of this river.
It may took a time when an Earth's surface breaks a part of the River's crust to form a sedimentary layer. It may took more years than the formation of Digit's falls to make the rock face shown opposite. In Digit's falls the rocks weren't really at the bottom of the sea. They're visibally still so it won't avoid very large waves of the waterfall when at a very fast speed. It also crosses and parallels each other so it creates effect of the sound of the waterfall. Some geological features visible are the size of boundaries, the type of rock and how it forms many years ago and a large rock next to the falls can be classified as a unusual plate tectonic.
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