Soil testing a few km away in a slightly similar area indicates a grey chromosol. This area has some of the oldest soils in Australia, possibly 370 to 320 million years ago. 20km away is 160 million years and supports a rich rainforest.
https://www.qld.gov.au/environment/land/management/soil/soil-testing/types
Wow, amazing!
And that was me being slack. I only cut 2 times in the first year, once in the second. But in wet years (like we had), 4 cuts would have been possible each year (usually about every 6 weeks). I reckon I could have got it a bit deeper if I was onto it.
It’s a near flat gully in a flood plain where it grows with a smaller catchment than average. Floodplain had been cowed and horsed for decades, degraded basically.
Same spot here, the photo is to the left of the tall grass a year ago: