The Hastings Beds, which are resistant to weathering, leading to outcrops, such as High Rocks Tunbridge Wells, and sterile soil only suited to heathland and forests of Scots Pine.
The Spa Valley Railway, a heritage railway, now connects the High Rocks pub beyond the High Rocks turnstiles to Tunbridge Wells, Groombridge and Eridge (on the London-Uckfield line of Southern Railway).
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It is particularly well exposed throughout the region between East Grinstead, West Sussex, and Tunbridge Wells, Kent, at localities such as; Stone Farm south of East Grinstead; Chiddinglye Rocks near West Hoathly; Toad Rock, Bull’s Hollow and Happy Valley west of Tunbridge Wells; and Harrisons Rocks, Bowles Rocks and High Rocks near Crowborough.
Author James A. Michener donated the High Rocks area to the park in 1956.
The next addition to the park was the High Rocks unit of Ralph Stover State Park, donated to the Commonwealth by the late James Michener, a famous local author.
Oregon Geographic Names states that Twin Rocks was named for two 100-foot-high rocks offshore in the Pacific Ocean.