1. Alexander RR (1981) Prédation scars preserved in Chesterian brachiopods: probable culprits and evolutionary consequences for the articulates. J Paleontol 55: 192–203
2. Aller RC (1982) The effects of macrobenthos on chemical properties of marine sediment and overlying water. In: Animal-sediment relations, eds McCall PM, Tevesz MJS. New York: Plenum, pp 52–102
3. Ausich WI, Bottjer DJ (1982) Tiering in suspension-feeding communities on soft substrata throughout the Phanerozoic. Science 216: 173–174
4. Babin C (1980) Elements of palaeontology. Chichester: John Wiley and Sons
5. Bambach RK (1977) Species richness in marine benthic habitats through the Phanerozoic. Paleobiology 3: 152–167