Organ Pipes National Park: Part 3

Sedimentary rocks underlying the New Volcanics in Organ Pipes National Park

 What are these rocks doing here? Why are sedimentary rocks so close to igenous rocks? Which rocks are older?

The valley of Jacksons Creek exposes steeply dipping fossilised Silurian sedimentary rocks overlain by flows from the Newer Volcanics basalt. They differ from the rocks in the Organ Pipes because these rocks are igenous rocks formed from lava while the latter are sedimentary rocks. The sedimentary rocks are so close to the igenous rocks because they were initially one type of rock but erosion, weathering and other natural disasters caused the rock to seperate and forming sedimentary rock. The igenous rocks are much older than the sedimentary rocks because they were the original rock that were there in the first place because they were created from the old volcanic areas in the park.