Read the section on "aquifers" and "aquitards" before you answer this question. Los Angeles used to be under the ocean, for millions and millions of years. Clays and shales snowed down to the ocean floor on top of L.A.
About a million years ago, greater L.A. rose out of the ocean. The San Gabriel Mountains, at the north of the Los Angeles basin are made of granite and have been rising out of the ground for the last six million years.
Irwindale is close to the bottom of the San Gabriel mountains..
Would you expect to find a big aquifer there? Why or why not? What would you expect to see if you dug into the ground by in Irwindale?
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