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Beach sand does not come from the ocean but from the adjacent mountains and the streams that empty into it.  Rock, eroded and carried by streams, is constantly being ground into finer and finer particles until it is deposited along the stream and at its mouth as sand.

In the Monterey Bay area, there are several types of sand on the beaches, differing from beach to beach.  The coarse gravels are derived from granitic outcrops.  The dark silt in one area is from local mudstone.  The white sugary sand, prized for use in glass and ceramics, comes from old sand dunes.  A few isolated beaches are a mixture of coarse granite grains and shell rubble.  Coarse sands result in steep beach faces.  Finer sands produce a flatter beach.

Winter storms sweep sand away, sometimes exposing bedrock.  Spring and summer tides carry it back again.  Much of the sand moved offshore accumulates as sand bars or is lost in offshore canyons.

In addition to quartz grains, over 18 other hard minerals have been found in the local sand; green hornblende and garnet predominate.  Much of the rock found in the Monterey Bay region is sedimentary, formed from elevated ancient sea floor deposits.  The old sands are being recycled - dissolved out and redeposited again and again.