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What is the reason behind Mt. Baldy sand dune's mysterious holes? By Karen Graham, Digital journal, Jun 27, 2016 http://www.digitaljournal.com/science/what-is-the-reason-behind-mt-baldy-sand-dune-s-mysterious-holes/article/468694 Research continues as Indiana’s Mount Baldy reveals secrets of dune dynamics, Indiana University, June 28, 2016 http://viewpoints.iu.edu/policy-briefings/2016/06/28/research-continues-as-indianas-mount-baldy-reveals-secrets-of-dune-dynamics/ The Paper is: Argyilan, E. P., P. G. Avis, M. P.S. Krekeler, and C. C. Morris, 2015, The origin of collapse features appearing in a migrating parabolic dune along the southern coast of Lake Michigan. Aeolian Research. Volume 19, Part A, pp. 137–149. http://dx.doi.org/10.1016/j.aeolia.2015.09.008 http://www.sciencedirect.com/science/article/pii/S1875963715000890 https://www.researchgate.net/publication/283579976_The_origin_of_collapse_features_appearing_in_a_migrating_parabolic_dune_along_the_southern_coast_of_Lake_Michigan https://www.journals.elsevier.com/aeolian-research/open-access-articles Argyilan, E. P., M. P.S. Krekeler, P. G. Avis, T. A. Thompson, G. W. Monaghan, and C. C. Morris, 2016, The formation of dune decomposition chimneys in a migrating coastal dune, Indiana Dunes National Lakeshore: Geological Society of America Abstracts with Programs. v. 48, no. 5, doi: 10.1130/abs/2016NC-275637 https://gsa.confex.com/gsa/2016NC/webprogram/Paper275637.html https://gsa.confex.com/gsa/2016NC/webprogram/Session39355.html A similar mechanism involving tree molds trapped Carboniferous vertebrates in the coal forests of Joggins, Nova Scotia. Go see: Dawson, J.W., 1896, Additional report on erect trees containing animal remains in the Coal- Formation of Nova Scotia. Proceedings of the Royal Society, 59, 362-366. Ferguson, L., 1988b. The "fossil cliffs" at Joggins, Nova Scotia: a Canadian case study. Special Papers in Palaeontology. vol. 40, pp. 191-200. Go see Figure 3. Ferguson, L., 1975, The Joggins Section. In I. McK. Harris (editor), Ancient Sediments of Nova Scotia. Guidebook for the 1975 field trip, Eastern Section, Society of Economic Paleontologists and Mineralogists, 111-118 p. or Maritime Sediments. vol. 11, 69. Yours, Paul H.