Premise: Gunsmoke Western was an American comic book series published initially by Atlas Comics, the 1950s forerunner of Marvel Comics, and then into the 1960s by Marvel. A Western anthology that ran 46 issues, it featured early stories of the Marvel Old West heroes Kid Colt and the Two-Gun Kid, and work by such artists as Jack Kirby, John Severin, Joe Maneely, Doug Wildey, and many others.
Hypothesis: Atlas Comics eventually became Marvel Comics.