Fire in the paradise: evidence of repeated palaeo-wildfires from the Araripe Fossil Lagerstatte (Araripe Basin, Aptian-Albian), Northeast Brazil

摘要

Reports on Cretaceous charcoals are relatively common on a global scale and have been increasing in recent years. Fossil charcoal from the Early Cretaceous mostly belongs to conifers (and other gymnosperms) and ferns whereas angiosperms become more common only during the Late Cretaceous. However, so far, reports of Cretaceous macroscopic charcoal are rare (three) for South America. Here, charcoal is identified from the Crato, Ipubi and Romualdo formations of the Early Cretaceous Santana Group within the Araripe Basin, Brazil. The presence of charcoal provides for the first time compelling evidence for the repeated occurrence of Early Cretaceous palaeo-wildfires in this region. The charred wood remains were identified as belonging to gymnosperms, which were important components of the palaeoflora during the Cretaceous in Northeast Brazil. The results presented here provide additional evidence for the occurrence of palaeo-wildfires in Northern Gondwana during the Early Cretaceous, increasing our understanding for the relevance of such events and their influence on palaeoenvironmental dynamics.