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davidcyclebackI'm just saying how the term is typically used. It's ordinarily used with 1800s photos. In the 1800s, it was harder to make large photos, so photos this size were rarer than in the 1900s. A little larger than 20x20 was the physical limit of an 1800s photo. I think the term is not only defined by the size, but by the rarity of the size for the time. There are lots of signed 16x20s of Derek Jeter and Terrell Owens, but no one call these mammoths.
For early 1900s photos, I'd call those massive Carl Horner team/league composites mammoths-- just because they're so unusually large for the day. I think they're something like 30x30 or something.
I wouldn't call Zach's photo a mammoth, but it is unusually large for a minor or major league team photo. And it's large size makes it more financially valuable.