Figure 1. View looking east from Oceanside Harbor. Four geologic regions are represented.
1) Foreground urban development covers lowland marine terraces along the coast.
2) Mid-foreland show low erosionally dissected plateaus of Tertiary age (uplands below 800 feet, mostly in the Vista, Ca region).
3) Distant gentle upwarp of the San Marcos Mountains (uplands underlain by Mesozoic-age rocks and volcanics up to +1,500 feet).
4) Distant
higher peaks of the higher Peninsular Ranges (Mesozoic volcanics) east of Escondido, CA (elevations up to +3,000 feet). |