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It unites all the fields of biology under one theoretical umbrella.

Deep time is the idea that the Earth has been in existence for 4.6 billion years, and throughout this time it has undergone many transformations.The Marcellus Formation (also classified as the Marcellus Subgroup of the Hamilton Group, Marcellus Member of the Romney Formation, or simply the Marcellus Shale) is a Middle Devonian age unit of marine sedimentary rock found in eastern North America.Named for a distinctive outcrop near the village of Marcellus, New York, in the United States, The shale contains largely untapped natural gas reserves, and its proximity to the high-demand markets along the East Coast of the United States makes it an attractive target for energy development and export.Considerable igneous activity was associated with the Caledonian orogenic belt, both intrusive (emplacement of magmatic bodies at depth) and extrusive (volcanic activity at the surface). Large areas of Asia east of the Ural Mountains were divided into separate landmasses at this point in Earth history.Their distribution is poorly understood, but many of them may have been attached to the margins of Gondwana.Stratigraphically, the Marcellus is the lowest unit of the Devonian age Hamilton Group, and is divided into several sub-units.