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DD1991

Caldecott Tunnel fossils

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DD1991

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.

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DPS Ammonite

A wide variety of fossils were found during the recent excavation of the fourth bore. I do not recall any dinosaur fossils being found in the SF Bay Area even though Jurassic and Cretaceous rocks such as the Clairmont Chert exist. See this article from the  UC Museum of Paleontology:  

 

http://www.ucmp.berkeley.edu/exhibits/caltrans/fourthbore3.php

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siteseer

Some partial ichthyosaur remains were said to have been found around Tracy, CA decades ago (article in a Californai Geology issue?) but that's outside of the SF Bay Area.  I think the Caldecott Tunnel material was Miocene age but don't recall any details.

 

In the late 80's/early 90's a friend who was a paleo student at UC Berkeley scouted all the sites that were noted in a guide from the 60's.  Nearly all of them were either built-on, paved over, off-limits or otherwise not open to collecting.  I think the one or two sites left were not productive.

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DD1991
On 1/22/2020 at 7:56 PM, siteseer said:

Some partial ichthyosaur remains were said to have been found around Tracy, CA decades ago (article in a Californai Geology issue?) but that's outside of the SF Bay Area.  I think the Caldecott Tunnel material was Miocene age but don't recall any details.

 

In the late 80's/early 90's a friend who was a paleo student at UC Berkeley scouted all the sites that were noted in a guide from the 60's.  Nearly all of them were either built-on, paved over, off-limits or otherwise not open to collecting.  I think the one or two sites left were not productive.

More info on the fossils found in the Caldecott Tunnel area is available at this link:

 

https://ucmp.berkeley.edu/exhibits/caltrans/fourthbore3.php

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