T. M. v. University of Md. Medical System Corporation · ¶71

From Marbury’s holding, then, a clear principle emerged: When a court “revises” or “corrects the proceedings in a cause already instituted,” it exercises appellate jurisdiction; when there is no previous “cause” or judicial proceeding to revise, it exercises “original” jurisdiction. 1 Cranch, at 175. And, from Marbury’s reasoning, another principle followed: A court can exercise appellate jurisdiction even if the action is filed outside of the most common appellate forms, such as a writ of error or a modern appeal, provided that there is another court’s decision to be revised. Ibid.

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