abraded bare bleak boulder break broken canada eroded erosion hard high layers montane mountains natural nature pieces rock Rockies rocky shards splintered stone summit terrain weathering worn cast cretaceous-period dinosaur dinosaur-tracks embedded footprint geological geology impressed impression imprint imprinted mark palaeontology paw paw-print prehistoric sharp solid toes blue cliff clifftop coastline Cornish cornwall England english Great Britain headland hillside inlet ocean rocks sea shore surf tide view water waves barren Dead Sea desert dry harsh hill Israel jordan landscape reflection salt sere stark sunset boulders granite granitic plants gorse austere cold debris glacier ice retreat Rocky Mountains scraped scratched scree snow stern beach stony destination direction hike path range track trail travel Trek