Indeed，had it not been for the superb preservation of these fossils，they might well have been classified as dinosaurs.
(虚拟语气，条件从句had it not been for the superb preservation of fossils省略了if，助动词had提前;正常语序为if it had not been for the preservation of these fossils)
确实，如果不是这些化石被极好地保存下来，它们也许会被归到恐龙里去。
分句1：had it not been for the superb preservation of these fossils
分句2：they might well have been classified as dinosaurs.
1和2并列
省略+倒装+虚拟语气
1：(省略+倒装)正常语序：if it had not been for the superb preservation these fossils
1是2的虚拟条件
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