Most of the vegetation in the area of Novato I live in (Hamilton) is bay marsh and wetlands, as it is right next to San Pablo Bay. This land was used as an Air Force Base, so there is a man made hill with hidden bunkers. This is mostly covered in grass, and the area has plenty of oak trees. The soil on this hill and around a lot of Hamilton is very dry and hard. People amend their soil in order to grow their gardens, because most of the soil is not ideal to grow anything in. Novato's soil overall is richer than that of Hamilton's.
Geology:
The San Andreas Fault line runs through San Francisco and the bottom of Marin, through Point Reyes. Over time, all land left of the fault line will shift north (moving approximately 2 inches a year). See this picture to see how the San Andreas fault is able to shift the land. However, Novato is on the right side, so it will gradually move south. This has been occurring for many many years, so the land around Novato has been constantly changing, and will continue to change in the future. Hamilton has always been a pretty flat area, excluding the man made hill, called "Ammo Hill" and one other small hill.
Sources: http://pubs.usgs.gov/of/2005/1127/chapter1.pdf
http://farm4.static.flickr.com/3102/3126130459_e642be0405.jpg
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