This is flint! she said to herself after a closer look. I'm sure of it. I need a hammerstone to break one open, but I'm just sure of it. Excitedly, Ayla scanned the beach for a smooth oval stone she could hold comfortably in her hand. When she found one, she struck the chalky outer covering of the nodule. A piece of the whitish cortex broke off, exposing the dull sheen of the dark gray stone within.
It is flint! I knew it was! Her mind raced with thoughts of the tools she could make. I can even make some spares. Then I won't have to worry so much about breaking something. She lugged over a few more of the heavy stones, flushed out of the chalk deposits far upstream and carried by surging current until they came to rest at the foot of the stone wall. The discovery encouraged her to explore further.
The wall, that in times of flood presented a barrier to the rushing torrent, jutted out toward the inside bend of the river. Contained within its normal banks, the water level was low enough to allow easy access around it, but when she looked beyond, she stopped. Spread out before her was the valley she had glimpsed from above.
Around the bend, the river broadened and bubbled over and around rocks exposed by shallower water. It flowed east at the foot of the steep opposite wall of the gorge. Along its near bank trees and brush protected from the cutting wind grew to their full luxuriant height. On her left, beyond the stone barrier, the wall of the gorge veered away, and its slope decreased to a gradual incline that blended into steppes toward the north and east. Ahead, the wide valley was a lush field of ripe hay moving in waves as gusts of wind blew down the north slope, and midway down its length the small herd of steppe horses was grazing.