Pteropus wrote:I'm not a geologist, but have an amateur's interest in the subject. I am not sure but the first one could be a piece of ironstone. The second and third ones do look like granite and the grains are too large to be basalt (generally basalt is fast cooling, resulting in small grains, and granite is slow cooling deep underground resulting in large grains), and I'm fairly certain dolerite is only found in Tasmania and not on the mainland (but happy to be corrected Strider?).
Cassie, do you know what soil type your place is on? Are you sure the shells in the garden come from your pop? Or could be that you are on an alluvial flood plain? Anyway, just a thought.
Lots of clay soil in our area. I think one of those may have come from Dubbo Zoo (and I think a lot of that stuff came from landscape people). We have only just realised how important it is to keep notes of where the rocks are found.
Our backyard is crazy. It is a regular 1/4 acre block in Cessnock.. but today I picked up some shards of flint, and some slate, and a whole pile of river rocks behind the shed. We have a barrel of coal in a corner, and the shells were stored in the stable by my father... and they migrated through the yard, and the oyster shells are because my pop used to throw them there (lol, it was my pop's home).