Not sure where you get “official” period of GA is 1938 - 1956? The GA was pretty much over with the end of WW2. Superheroes tried to fight crime after the defeating the Axis Powers, but the crime comics along with romance and horror genres, caught the public’s attention given the postwar fears of atomic war and communism. The best examples of this change are first seen in comics like Crime Does Not Pay, Young Romance, and then of course EC Comics. DC Comics did keep the Superman (Adventure and Superboy) and Batman “family books” along with Wonder Woman through the 1950s, which was significant given that a part of the DC Silver Age success was attributed to a continuity of these GA characters (see BB 28 and the Justice League of America). Still, comic books published by EC Comics were in no way similar to what was hit the newsstands during the war years that preceded. So it’s clear that the period following the demise of the superhero (see Atlas and then that publisher’s failed attempt to bring back the Submariner, Captain America, and the Human Torch during the mid-50s) was a different era and should be called the Atomic Age. Period.