"Large, conglomerate caves in north-eastern Iberia have been significant places since the Neolithic through to historical times; however, their significance during the Palaeolithic has barely been explored. This project is the first systematic study of the use of these iconic geological landmarks among Pleistocene hunter-gatherers."
https://www.cambridge.org/core/journals/antiquity/article/palaeolithic-archaeology-in-the-conglomerate-caves-of-northeastern-iberia/2AD722E1B266C7EF57AD80B24B152E2E