Geology books can be found on the first floor of the library in the compact shelving next to the cafe.
Books are a core resource in geology, and you'll want to use the library's discovery layer to Search Books, Articles, and More at the Claremont Colleges Library and Beyond, as well as browsing the shelves of the geology collection to find books for your research. You can search by keyword, author, title, subject, etc.
Browsing the collection is a great way to find valuable books that slip through a typical library catalog search. In academic libraries in the US, books are grouped by subject and the call numbers correspond to those subjects. You'll want the Library of Congress subject breakdown for math before you begin to browse for books in your area of interest.
LC subclassification for QE:
QE1-350.62 General geology Including geographical divisions
QE500-639.5 Dynamic and structural geology
QE521-545 Volcanoes and earthquakes
QE601-613.5 Structural geology