Valentine, James W.; Lipps, Jere H.(National Park Service, 1965)
The floor of the ocean off southern California consists of a
series of low depressions and basins separated by high ridges,
some of which protrude above sea level to form the Southern California
Islands. The basins and ...
Fossil closed-cone pines similar to Californian species that
now inhabit maritime and interior areas were alreadv established
as distinct adaptive groups in Miocene time. Th~ir fossil associates
suggest that floristically ...