There are many aspects of geology demonstrated in the area around Hillswick. The Red sandstones and Volcanic lavas of Eshaness, which have produced spectacular cliff scenery are unmissable and the geology is explained on the information board.
The Ness at Hillswick itself has much to offer with a variety of metamorphic rocks mostly running East to West which you will cross as you walk southwards. A view from the west cliffs on the Ness displays the igneous rock of The Drongs which so far have dramatically withstood the ravages of the sea, is the highlight of the walk.
Even before arriving at Hillswick have a brief pause at Mavis Grind to look at the geological display which shows twenty of the rocks which make up Northmavine.
For more information visit the Tangwick Museum to see the geological maps of the area. The main museum at Lerwick does exhibit many of the rocks and minerals as well as photographs of the Hillswick and Northmavine area and is well worth a visit.