Tałanda, M., Dzieçioł, S., Sulej, T., and G. Niedźwiedzki. 2011. Vertebrate burrow system from the Upper Triassic of Poland. Palaios 26:99-105. DOI: 10.2110/palo.2010.p10-024r
Abstract - In this paper we report on a rare fossil vertebrate burrow system in Upper Triassic (Norian) fluvial deposits of the Holy Cross Mountains in central Poland. The burrows are preserved mainly by prominent green infillings in red mudstone and claystone exposed in the wall of a clay pit. The mode of occurrence, morphology, and size of the burrows suggests that cynodont therapsids most likely constructed them.