. They are often referred to just as 46ers. Origins The first 46ers were brothers Robert and George Marshall, and their guide and family friend Herbert Clark. The Marshalls thought up the idea after spending much of their childhood in the region and examining the collection of Verplanck Colvin maps owned by their father, Louis Marshall. They devised criteria for the high peaks they'd climb, choosing any summit that was more than 4,000 feet (1,219 m) above sea level in elevation with at least 3… (More on 46ers)