1. Dpto de Geodinámica, Estratigrafía y Paleontología, Facultad de CC. Geológicas, Universidad Complutense de Madrid, Madrid, Spain
2. College of Resources and Environmental Engineering, Guizhou University, Guiyang, China
3. Guizhou Research Center for Palaeontology, Guiyang, China
4. Key Laboratory of Karst Georesources and Environment (Guizhou University), Ministry of Education, Guiyang, China