The Terrace Falls area at Hazelbrook is one of the most interesting in the Blue Mountains. I can recommend Keith Painter's "Pocket Pal" booklet titled "Terrace Falls" for modern descriptions of walks in this area. See the website www.mountainmistbooks.com for more information.
There are many online photographs, walk descriptions and videos you can check out. Here are a few.
Terrace Falls Walk Hazelbrook (David Noble): http://www.david-noble.net/blog/?p=2861
Zek Media: https://www.youtube.com/watch?v=VzyCLNNzURk
https://johnsbluemountainsblog.blogspot.com/2013/12/links-to-all-blog-entries-and-relevant.html All Blue Mountains blogs and videos
All New England and other Geology blogs and videos
Limestone Caves of NSW
Song Studies. Bible studies based on hymns and songs
Shoalhaven District Geology.