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My dad was telling me a story about men finding fossils during construction of the Caldecott Tunnel in Oakland, and remember hearing him say something about dino fossils being found there. I had the opportunity to investigate this rumor and when I got a copy of "Dinosaurs and Other Mesozoic Reptiles of California" and I did an index search for Contra Costa county, there was just a mention of a reptile tooth found in Contra Costa county. Therefore, when I went online, I realized that only mammal fossils were uncovered among terrestrial vertebrate bones during construction of Caldecott Tunnel. Are you familiar with fossil finds made during the construction of Caldecott Tunnel.