Although Planet Earth itself is 4.5 billion years old, the oldest rocks in San Diego are comparatively young at only 150 million years of age. This should not really come as a surprise, as the reader realizes all the fault lines and as a result earthquakes in the area. Being on the edge of the continent, tectonic plate movement has forced up much magma into our area thus our area is relatively young.
Let us now skip ahead, by millions of years, as much of the topology of the area has been formed in the last 2.5 million years. There are two main forces shaping the region.
If we looked at San Diego a mere 100,000 years ago, much of it was underwater. Only the tops of Point Loma and Mount Soledad would have been visible. As a result of sea levels and tectonic forces, however, water was able to cut channels through the land resulting in the topology you see in the area today.
For more current happenings, here are a few points of interest:
Of course San Diego's history can fill volumes, but hopefully you will have a bit better idea of the area that many of us call home.
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