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One of Greenland’s largest bodies of Archean (meta)sedimentary rocks occurs on the ∼5.5 by 2.0 km nunatak Isortup Nunataa (∼65°31′N 49°54′W) and is ∼35 km north of the Eoarchean Isua supracrustal belt with its world’s best record of early sedimentary and volcanic systems. The nunatak was visited to ascertain if its metasedimentary rocks are also Eoarchean and thereby provide extra insight into the early Earth. The metasedimentary rocks are derived from a ca 3060 Ma arc-like volcanogenic source and can be assigned to the Akia terrane that crops out immediately to the west. However, glacial erratics scattered over the nunatak indicate there are well-preserved Eoarchean rocks including 3834 Ma metatonalite hidden to the east under the Inland Ice. This demonstrates there are still occurrences of Eoarchean rocks out there to be found by a mix of logic and luck. These findings will all enhance our knowledge of the early Earth, to help answer the big questions about the import

Inland iceGreenland generalEoarchean isuaIsortup nunataaWest greenlandYearly earthUnatak isortup nunataaIrcon geochronology