Shell money most valued by the Native American tribes of the Pacific Coast from Alaska to northwest California was "Dentalium shell", a species of long narrow marine shelled mollusk, a tusk shell or scaphopod. The tusk shell is naturally open at both ends, and can easily be strung on a thread. This shell money was valued by its length rather than the exact number of shells; the "ligua", the highest denomination in their currency, was a length of about 6 inches. Farther south, in central California and southern California, the shell of the olive snail "Olivella biplicata" was used to make beads
Prehistoric beads in the Philippines cargo. Sarkar discusses Wheatley's eleven main trade routes: "The three Pagodas between Moulmein and Tavoy, and the three Cedis route; the Tenasserim River route in Burma; the Kra Isthmus route; the Takuapa River route in Thailand; the Trang River rout in Thailand; the Kedah-Patani route; the Perak-Petani route; the Kelantan-Malacca route by way of the Panarikan in Malaysia; the Pahang-Malacca route by way of the Panarikan; the Sembrong route; and the Bernam-Pahang route." Ille site can be found in El Nido in Palawan along with other cave complexes. According to Szabó , characteristics of the shell beads that were found