Collette, J.H. et al. 2011. Insights into an Early Jurassic dinosaur habitat: ichnofacies and enigmatic structures from the Portland Formation, Hoover Quarry, Massachusetts, U.S.A. Atlantic Geoscience. 47, (May 2011), Pages 81 – 98. DOI:https://doi.org/10.4138/atlgeol.2011.003.