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Abstract: In paleontology, the casting allows the copy of ground levels of excavation. Here, the method and technic using silicone, polyester and fiberglass are developed for realizing the matrix. The copy is realized in a mold by coloration with natural earths, then two layers of gel-coat and finally three layers of polyester and fiberglass. The copy allows the conservation and the broadcasting of levels of excavation at a given time and therefore make easier their study — fundamentally the taphonomy — in laboratory. [Copyright &y& Elsevier]