Several of the exhibits at the Talbot Rice Gallery, Edinburgh, when we visited in February featured circles of different sorts, mostly of natural origin, but some not:-

Thios one has a depiction of Copernicus’s heliocentric solar system in the book at the centre:-

This was on the wall. It looks like the trace of an eccentically orbiting comet or something of that kind:-

Liesegang Rings. I confess I had only heard of Liesegang Rings in a chemical context before this but I now know they occur geologically too, as evidenced below:-

The Brough of Birsay is an island just off the north-east coast of mainland Orkney. I blogged here about the causeway you have to cross to access the island.

It is also home to some archæological remains (as well as a Stevenson lighthouse which we didn’t visit.) The weather was fine when we walked across the causeway to the island but while we were there it started to rain and the wind was so strong the rain was coming in horizontally, so discretion prevailed over perseverance. Even so by the time we got back to the car we were thoroughly drookit.

There was some nice geology just where the path from the causeway meets the brough proper.

The archæology on the brough comes from three distinct eras. First there was some Pictish occupancy. However this Pictish symbol stone is a replica, unfortunately. (Though there was such a stone found on the brough.)

There is a better photograph of the symbol stone on Historic Scotland’s Birsay webpage if you click through the pictures.

As the information board says there was later Norse – in two phases – and ecclesiastical building on the island.

Remains of Norse houses:-

A later Norse house:-

Another later Norse house:-

Birsay may have been the home of Thorfinn the Mighty.

Skara Brae (see previous posts) lies beside the Bay of Skaill which has a lovely scenic beach.

Beach from Skara Brae:-

Panorama of bay and beach:-

There was a colouration difference under the water here:-

Further along the beach we spotted a fairly picturesque ruined building, perhaps once a croft:-

The abandoned agricultural equipment in foreground bolsters that assumption:-

Further along still we found this fantastic rock formation, layers on layers of sediment:-

You can see the slabs lying in the foreground. Lots of buildings in Orkney seemed to be made from slabs of stone like this.