Marrella is the most abundant genus in the Burgess Shale.[10] Most Marrella specimens herald from the 'Marrella bed', a thin horizon, but it is common in most other outcrops of the shale. Over 25,000 specimens have been collected;[2]5028 specimens of Marrella are known from the Greater Phyllopod bed, where they comprise 9.56% of the community.[11]