The Green Scrub Basalt and its association with the Lapstone Structural Complex, eastern New South Wales
Abstract
The Green Scrub Basalt is located on the western side of the Lapstone Structural Complex (LSC) in the Sydney Basin. It was initially mapped as a neck, but more recently it has been viewed as a flow associated with other basalts in the Blue Mountains Volcanic Province. As a consequence, it was inferred that the age of the LSC was at least the age of the basalt, dated at 18.8 Ma. This study has carefully mapped the Green Scrub Basalt and re-establishes it as a neck. As such it does not constrain the age of the LSC. Local dips across the LSC show that the structure of the LSC is likely to be a fault propagation fold above a west-dipping thrust. The structure may have been initiated in the Neogene when pollens were deposited at nearby Mountain Lagoon.
Fields of Study & Subjects
Geological Studies and Exploration
Geological and Geochemical Analysis
Geological and Geophysical Studies
Publication details
- Journal / source
- Australian Journal of Earth Sciences
- Volume
- 73
- Issue
- 2
- Pages
- 171–179
- Publication date
- 17 February 2026
- Language
- EN