The arrival of the Spanish in the 1776 decelerated the culture, sovereignty, religion, and language of the Ohlone. Before the Spanish invasion, the Ohlone had an estimated 500 shellmounds lining the sea and shores of the San Francisco Bay. Shellmounds are essentially Ohlone habitation sites where peopled lived and died and often buried. The mounds consist predominately of molluscan shells, with lesser amounts mammal and fish bone, vegetal materials and other organic material deposited by the Ohlone for thousands of years. These shellmounds are the direct result of village life. Archaeologists have examined the mounds and often refer to them as "middens," or "kitchen midden" meaning an accumulation of refuse.