When I am out for a hike I often find larger and smaller rocks I would like to have in my rock garden. Unfortunately they are either too large to move, or in National Parks or similar areas.
But I can take pictures!
The Oslo Rift is known for it's special geology. I won't tire you with details (I am no expert either) but some of the rock is Cambro-Silurian limestone, rhomb porphyry lavas and breccias. Especially the eroded limestone would be nice in a rock garden!
The island Jomfruland is glacial moraine and consist of clay, sand, and any kind of rock mainly from the Oslo Rift but also from the continent (Denmark). Flintstone from Denmark was and still is, transported by the sea ice in winter.
Here are some of the stones, most are limestone:
The two last are breccias (I hadn't any pictures of rhomb porphyry, sorry!):
I guess some of you can contribute with rocks from your area ;)