There is very little in the way of natural rock exposure in the Cardiff area. One of the best examples is at the eastern end of Garth Hill, where there are some attractive sandstone outcrops.
Last weekend I took a brief stroll up the Garth to have a poke around these outcrops for bryophytes. Before I even got to the hill, I stepped on a patch of Common Crystalwort (Riccia sorocarpa) rosettes, which were abundant in the car parking lay-by.
|Riccia sorocarpa (click to enlarge)|
|Bloody-nosed Beetle and Sermylassa halensis|
|Roosting Peacocks (just visible behind cobwebs)|