Eccentric flints are among the finest lithic artefacts produced by the ancient Maya. Among the artifacts found were pottery, coins, buttons, musket balls, flints and musket parts. Usually at Neolithic sites flints far outnumber animal bones. At Little Gonerby a neolithic settlement site was discovered with finds of pottery and flints. Subsequent periods of subsidence and submergence deposited clays and flints. Two of these featured finds of Heavy Neolithic flints of the Qaraoun culture. Bronze Age pottery and burnt flints have been found in separate sites in Brentford. The Upper Chalk is a soft pure-white limestone with abundant flints. The soil is mostly clay with flints. Most contemporary flints are hardened with iron oxide and magnesium oxide. Levallois flints and bones and similar surface material were found amongst brecciated deposits. The flints that make up Littlehampton's West Beach contain quite a few fossils. Evidence of a barrow together with 200 worked flints were found near Chilton Street. Spears were tipped with the same materials, or sometimes with flints. The stone used with the flints is Bath stone.