A question about "Trinitychelys hiatti" and the Chico Formation

["Brian Tegowski" <tegowski@primenet.com>]

I found the Following information on the UCMP Vertebrate Collections page
(http://www.ucmp.berkeley.edu/collections/vertebrate.html) 

Trinitychelys hiatti (114260)
-------------- TAXONOMIC INFORMATION --------------
                  Class: Reptilia
                  Order: Chelonia
                Family: Baenidae
                Genus: Trinitychelys
           Subgenus: 
              Species: hiatti
         Subspecies: 
             Identifier: Gaffney,E.S.
     Year Identified: 1972
 Museum Specimen Number: 114260
                Status: TYPE
              Element: SKULL
-------------- LOCALITY INFORMATION --------------
Continent or Ocean: North America
              Country: USA
                  State: California
                County: Monterey Co
     System/Period: Cretaceous
         Storage Age: Maastrichtian
            Formation: Chico
                     Age: 
 Musuem Locality Number: V-75074
-------------- CITATION INFORMATION --------------
            Publication: 
               Remarks: EQUALS UCMP A919

1 Can anyone please provide me with a citation(s) if this specimen has been
described or referenced?

2 What is the interpretation Chico Formation? My limited California geology
book collection does not describe this formation.

B. Tegowski