Woodcock, D. al., et Supplemental material: Geologic and taphonomic context of El Bosque Petrificado Piedra Chamana (Cajamarca, Peru) GSA Data Repository Item 2009023, GSA Bulletin, Vol. 121, p. 1172. File size: 6 p., about 598 KB. Geoscience 2009-01-01
    https://gsapubs.figshare.com/articles/journal_contribution/Supplemental_material_Geologic_and_taphonomic_context_of_El_Bosque_Petrificado_Piedra_Chamana_Cajamarca_Peru_/12346517
10.1130/2009023