.0                                                                              
              UNCONSOLIDATED DEPOSITS OF QUATERNARY                             
                      AND LATE TERTIARY AGE                                     
                                                                                
QTsa   UNCLASSIFIED SURFICIAL DEPOSITS AND UNDERLYING ALAMOSA FORMATION         
         (GRAVEL, SAND, AND SILT) IN SAN LUIS VALLEY                            
QTa    ANCIENT ALLUVIUM--In isolated patches that may not all be of the         
         same age