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This is probably going to sound like a mind-bogglingly simple question for anybody who knows, but...
Has technological progress made it that much easier to find and uncover fossils over the past century? If, say, Sir Hypothetical of the Royal Society had decided to go on an expedition to Mongolia or northern China in the late 19th century, would it have been that much more difficult for him to discover some of the fossils found in the Yixian Formation?