Euendolith borings in Chancelloria and Nisusia from the middle Cambrian (Miaolingian) of North Greenland (Laurentia)

Borings of microscopic organisms (euendoliths) are described from the Henson Gletscher Formation (middle Cambrian, Miaolingian Series, Wuliuan Stage) of Peary Land, North Greenland (Laurentia). Partially phosphatised sclerites of Chancelloria and valves of the brachiopod Nisusia reveal abundant casts of borings following dissolution of skeletal calcium carbonate in weak acetic acid. Threads referred to Scolecia dominate, occurring together with coccoids (Planobola) and the branching Fascichnus , in a suite comparable to a lower Cambrian assemblage from the Maidiping Formation of Sichuan, China.