Geologic units in Broomfield county, Colorado

Additional scientific data in this geographic area

Denver and Arapahoe Fms (Tertiary-Cretaceous) at surface, covers 61 % of this area

Sandstone, mudstone, claystone, and conglomerate; Denver is characterized by andesitic materials

Laramie Fm and Fox Hills Sandstone (Cretaceous) at surface, covers 31 % of this area

Laramie Fm and Fox Hills Sandstone

Gravels and alluviums (Quaternary) at surface, covers 4 % of this area

Includes Broadway and Louviers Alluviums

Laramie Fm (Cretaceous) at surface, covers 3 % of this area

Shale, claystone, sandstone, and major coal beds

Older gravels and alluviums (Quaternary) at surface, covers 1 % of this area

Includes Slocum, Verdos, Rocky Flats, and Nussbaum Alluviums in east, and Florida, Bridgetimber, and Bayfield Gravels in southwest