A cross section of rock is exposed, revealing the five evolutionary periods of the park and providing visual evidence of how the surrounding landscape was formed.
The Congelin Siding Walk follows the old Pinjarra to Narrogin railway line, which was constructed in 1925 and known as the Hotham Valley Branch (Dwarda line).
The wide sweep of beach is bounded at both ends by huge granite boulders, formed at the same time as the granites of the Porongurup Range, 79km to the north.
The raised viewing area, a short walk from the carpark, has a good view of the battlement-like face of the range. Sunrise is a particularly good time to experience the view.