Proceedings of the 12th International INQUA meeting on paleoseismology, active tectonic and archaeoseismology

Fig. 2 (both pages): Soft-sediment deformation structures and their occurrence in the stratigraphic column of the Tena Formation. a) The stratigraphic section of the sedimentary deposits of the Tena Formation reveals that deformation structures predominantly occur within the mudstone of stratigraphic unit U2, the claystone of stratigraphic unit U5, and the fine-grained sandstone of stratigraphic unit U7. However, these structures are intercalated between deformed and non-deformed stratigraphic units. b) Structures exhibiting loop bedding morphology resemble elongated chains, featuring deformed lamination that conforms to the structure's shape and are primarily isolated within U2. c) The ball-and-pillow structure is characterized by its rounded morphology, complete isolation from the overlying layer, and the presence of deformed lamination surrounding the structure. They are present in stratigraphic unit U5. d) Structures with load cast morphology, often associated with flame structures, exhibit concave downward shapes, while flame structures resemble flames and typically intrude into the underlying unit, between U5 and U4, and U7 and U6. e) Deformed lamination structures are characterized by folds occurring between undeformed laminations within the original layer of stratigraphic unit U5. f) Pseudonodules structures are characterized by detached from the overlying bed in stratigraphic unit 1 and isolated in stratigraphic unit 2, displaying various irregular morphologies.