Thechaibasa Formation In Eastern India, Which Was Deposited Between 2100 and 1600Million Years Ago, Shows Deformations That Must Have Formed When the Sedimentswere Not Yet Consolidated. some of These Deformation Structures Have Never Beendescribed Before. Here They Are Described, Depicted and Their Origin Isanalysed. We Show That They Must Be the Result of Shocks, Which Can Only Beexplained Satisfactorily As Triggered By Earthquakes. the Layers Containingthese Deformation Structures Are Termed Bseismitesq. They Are Among Theearliest Records of Earthquakes Known In the Earth’S History.Penecontemporaneous Decimetre-Scale Soft-Sediment Deformation Structures Arereported from the Basal Part of the Upper Jurassic–Lower Cretaceous Vaca Muertaformation, In the Malargüe–Las Leñas Area of the Back-Arc Neuquén Basin(Mendoza Province, Central Andes). the Deformed Interval (Amarillas Bed) Isonly 0.3 to 0.9 M Thick But Occurs In a Wide Area, Larger Than 1500 Km2. Itsage, Determined By Ammonite Biostratigraphy, Is Early Tithonian. Thesoft-Sediment Deformation Structures Were Generated In Finely Laminated,Partially Consolidated, Organicrich, Carbonate Microbialites That Weredeposited In Open-Marine, Poorly Oxygenated Settings, Apparently Devoid of Anysignificant Slope. Those Structures Include Boudins of Different Sizes Andcomplexity, a Variety of Folds, Normal (Listric) Dm-Scale Faults,Sub-Horizontal Detachment Surfaces and Other Features, Which Are Part Ofseveral Larger-Scale, Complex Slu ...