Where is the K–Pg (K–T) boundary exposed in the U.S?

[Ruken]

The Cretaceous–Paleogene (K–Pg) boundary, formerly known as the Cretaceous–Tertiary (K–T) boundary, is a geological signature, usually a thin band of rock. K, the first letter of the German word Kreide (chalk), is the traditional abbreviation for the Cretaceous Period and Pg is the abbreviation for the Paleogene Period

Cretaceous–Paleogene boundary

The wiki article has pictures from Colorado, but I’m wondering where else I can see it. I don’t know much about geology.

[whc.03grady]

Collecting a chunk of the K-P Boundary (neé the K-T boundary)