.0                                                                              
                UNCONSOLIDATED SURFICIAL DEPOSITS                               
                   AND ROCKS OF QUATERNARY AGE                                  
                                                                                
Qa     MODERN ALLUVIUM--Includes Piney Creek Alluvium and younger deposits      
Qg     GRAVELS AND ALLUVIUMS (PINEDALE AND BULL LAKE AGE)--Includes             
         Broadway and Louviers Alluviums                                        
Qgo    OLDER GRAVELS AND ALLUVIUMS (PRE-BULL LAKE AGE)--Includes Slocum,        
         Verdos, Rocky Flats, and Nussbaum Alluviums in east, and Florida,      
         Bridgetimber, and Bayfield Gravels in southwest                        
Qe     EOLIAN DEPOSITS--Includes dune sand and silt and Peoria Loess            
Qeo    OLDER EOLIAN DEPOSITS--Includes Loveland Loess                           
Qd     GLACIAL DRIFT OF PINEDALE AND BULL LAKE GLACIATIONS--Includes some       
         unclassified glacial deposits                                          
Qdo    OLDER GLACIAL DRIFT (PRE-BULL LAKE AGE)                                  
Ql     LANDSLIDE DEPOSITS--Locally includes talus, rock-glacier, and thick      
         colluvial deposits                                                     
Qb     BASALT FLOWS (AGE <1.8 M.Y. 1)