# Fossil Cave

- **Country:** Australia
- **Coordinates:** -37.731900, 140.531000
- **Depth:** 15 m
- **Access:** Above water - public (no disabled access). Underwater - CDAA members only.
- **Length:** 70 m
- **Survey:** FUUC, 1978Allum and Garrad, 1979SAUSS, 1987Horne, 1986-88
- **Geology:** Oligocene coralline limestone
- **Hazards:** silting, overhead environment
- **Location:** Princes Highway, Tantanoola, South Australia, Australia
- **Difficulty:** Above water - no stated difficulty Underwater - CDAA Advanced Cave grade
- **Other Name:** The Green Waterhole, 5L81
- **Entrance Count:** 1

Fossil Cave (5L81), formerly known as The Green Waterhole, is a cave in the Limestone Coast region of south-eastern South Australia. It is located in the gazetted locality of Tantanoola about north-west of the city of Mount Gambier, only a few metres from the Princes Highway (Route B1) between Mount Gambier and Millicent. It is popular with cave divers and is notable for being both a unique paleontological site and the "type locality" for very rare crustaceans (syncarids - Koonunga sp.) which to date have been found only in caves and Blue Lake in the Mount Gambier region.

**Source:** https://en.wikipedia.org/wiki/Fossil_Cave (Wikipedia, CC BY-SA)