Having another go after 360 million years

 

The Old Red Sandstone at the southern end of Bute is amazing. It contains large pebbles which are Dalradian and were eroded from mountains north of Bute 360 million years ago. They are quite rounded. They must have sat on the beach back then but ended up fused into the sandy matrix and turned into stone. Now erosion on a later beach is releasing the pebbles which are free again to be weathered and turn to sand. Geological time scales are mind blowing.