What discoveries did the boys make on their boat expedition? For instance, what are the new signs of human habitation found on Coral Island?

In
Golding's , two expeditions are described, but neither involves a boat.
 The first expedition occurs early in the book, and is one of 's first decisions as chief--to
explore the island.  On this expedition, he takesand.  They spot the candle-buds that Simon
recognizes, they roll a rock, and discover Castle Rock. The island is untouched by humans.
 They...