Abstract in English below. Biocorrosion, a new parameter to take into account when interpreting the distribution of rock paintings. Recent studies in several caves show that bats have had a significant impact on the walls and the roof of many caves in the world. These forms, unknown until recent years, show the importance of the phenomenon of biocorrosion, as the walls retreated by dissolution from a few millimeters to several decimeters or even meters. Although this post-karstogenetic weathering implies a revision of some processes invoked in the development or the reuse of karstic conduits, it also has consequences on rock art.
Homme de Pékin
Homme de Pékin — Wikipédia
Stonehenge and the Ice Age How much do we know about Stonehenge? Less than we think. And what has Stonehenge got to do with the Ice Age? More than we might think.
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Researchers have found more pieces of this critter and reconstructed it as a formidable predator. When the first fragments of Hurdia were described nearly one hundred years ago, they were assumed to be part of a crustacean-like animal. It was not then realised that other parts of the animal were also in collections, but had been described independently as jellyfish, sea cucumbers and other arthropods.