Hi Will, geology is weakly metamorphosed sediments (turbidite) that have been folded and tilted vertically by the Cullerin (Lake George) fault block with some basic quartz intrusions. The rocks flake into 'shingle' like slabs as they erode (hence the old name for Brooks Creek - shingle house creek and - shingle hill way etc) so there are expanses of flat shingle like rocks on the surface that are between about 20 to 40mm thick that seem to provide good habitat. The surrounding veg is all native grassland / grassy woodland and aspect is predominantly west facing slopes.
thanks very much Michael - that is just what i wanted to know. Some sites near Queanbeyan and Googong sound just like that as well. As far as I am aware, apart from Black Mountain sandstone, in the ACT region Aprasia have not yet been found under sedimentary rocks (shale, mudstone etc) or under granitic rocks such as graniodiorite (granite - like at Tidbinbilla). Most records to date are associated with igneous rocks (like the volcanics found in the lower Molonglo valley and Canberra Nature Park, and with metamorhpic rocks (like your site). This is a good record probably the most NE record for our region? I know there are records much further north in NSW but so far your records and Googong records seem to be the most easterly. That will most likely change as more records come in.
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