Perennial Lakes as an Environmental Control on Theropod Movement in the Jurassic of the Hartford Basin

摘要: Eubrontes giganteus is a common ichnospecies of large dinosaur track in the Early Jurassic rocks Hartford and Deerfield basins Connecticut Massachusetts, USA. It has been proposed that trackmaker was gregarious based on parallel trackways at site Massachusetts known as Dinosaur Footprint Reservation (DFR). The gregariousness hypothesis not without its problems, however, since parallelism can be caused by barriers direct animal travel. We tested examining orientations five sites representing permanent ephemeral lacustrine environments. Parallelism only prominent DFR, where show bimodal orientation distribution approximates paleoshoreline. By contrast, are uncommon facies, even with numbers trackways, those do occur exhibit differences morphology, suggesting they were made different times. Overall, evidence presented herein suggests seen Basin better explained response to lake acting physical barrier rather than gregariousness. Consequently, these should used support basal sauropodomorph unless other substantiate hypothesis.