Catalina Schist, Metamorphic rock formation in Los Angeles County, United States.
Catalina Schist is a metamorphic rock formation scattered across Los Angeles County, made up of different rock types that formed deep underground under intense heat and pressure. You can see exposed sections of this formation at various locations throughout the region, where the different rock types are visible to visitors.
This rock formation was created around 100 million years ago during the Cretaceous Period, when a tectonic plate pushed deep beneath the North American continent. The extreme conditions at such depths transformed sedimentary rocks into the metamorphic rocks visible today.
Geologists from research institutions across California regularly conduct field studies at various outcrops to examine mineral compositions and structural patterns.
Several hiking trails and viewpoints around Los Angeles County provide access to where you can see these rock formations up close. It helps to check ahead which areas have the easiest access and to wear sturdy footwear when exploring.
The formation shows an unusual pattern where rocks formed at higher temperatures sit closer to the surface than rocks formed at lower temperatures. This reversal of the normal temperature pattern is something many visitors find surprising when learning about the site.
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