There are in the Cerrillos Hills a few thin surficial stream deposits and pediment gravels called Quaternary Alluvium that date from about 2 million years ago, most notably represented by the gravelly Ancha Formation that covers the plain north and east of the hills.
(a few thin surficial stream deposits and pediment gravels; called; Quaternary Alluvium) (the gravelly Ancha Formation; covers; the plain north and east of the hills)
a few thin surficial stream deposits and pediment gravels the gravelly Ancha Formation
called covers
Quaternary Alluvium
the plain north and east of the hills