In Lord of the Flies what strange things did Ralph notice as the boys are playing around the rolling rocks?

Ralph commented that there was no sign of either smoke or boats, indicating he felt that the island was probably previously uninhabited. The island is described as being roughly boat shaped, with the mountain at the blunt end. The island slopes gradually through jungle towards the pointed end, where it terminates in a rocky outcrop, almost a separate small island, which is connected to the main island by a narrow causeway. On one side the island has a rocky shoreline bordering open ocean. The other side of the island has a sandy beach and is protected by a coral reef, which runs almost parallel to the shore and encloses a lagoon. There is a shelf of pink rock which projects through the jungle, across the beach and juts into the lagoon. It has a level surface topped by a shallow layer of soil which supports some palms which are inclined to fall over when they have reached a certain height. The boys call this natural jetty the platform and use it to hold there meetings. There is a natural 'bathing pool' close to the platform and a little further along from the platform, heading towards the pointed end of the island, there is a small stream. On their way back to the beach the boys found candle bushes and also discovered that there were pigs on the island.