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animal. These tunnels, rarely larger than the little finger, are sometimes coated with a limy deposit internally.
At about 1000 or 1100 feet a limy or alkaline layer, quite thin, was sometimes passed through. (Specimen) Some pebbles from 1400 feet (Specimens) were evidently waterworn and mostly quartz. The water from this depth has a slightly milky tinge until it gives off its gas when it becomes nearly clear and of a pale greenish tint in mass. 

The conclusions from this data are that the valley as an estuary is older than the volcanic conglomerate and than the present elevation of the Coast Range. That deposition just from the sierras and subsequently also from the Coast Range has